diff --git a/.gitignore b/.gitignore
index d48795685..3e40963ee 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ coverage.xml
 
 # Stuff generated by editors.
 .idea/
+.vscode/
 .vimtags
 
 # Stuff in the root.
@@ -29,6 +30,7 @@ setuptools-*.egg
 .pytest_cache
 .hypothesis
 .ruby-version
+.venv
 
 # Stuff in the test directory.
 covmain.zip
diff --git a/coverage/html.py b/coverage/html.py
index 1fbac4b36..e56e30797 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -159,11 +159,6 @@ class HtmlReporter:
     # directory.
     STATIC_FILES = [
         ("style.css", ""),
-        ("jquery.min.js", "jquery"),
-        ("jquery.ba-throttle-debounce.min.js", "jquery-throttle-debounce"),
-        ("jquery.hotkeys.js", "jquery-hotkeys"),
-        ("jquery.isonscreen.js", "jquery-isonscreen"),
-        ("jquery.tablesorter.min.js", "jquery-tablesorter"),
         ("coverage_html.js", ""),
         ("keybd_closed.png", ""),
         ("keybd_open.png", ""),
diff --git a/coverage/htmlfiles/coverage_html.js b/coverage/htmlfiles/coverage_html.js
index cba668a89..edd0782e4 100644
--- a/coverage/htmlfiles/coverage_html.js
+++ b/coverage/htmlfiles/coverage_html.js
@@ -7,227 +7,192 @@
 
 coverage = {};
 
-// Find all the elements with shortkey_* class, and use them to assign a shortcut key.
-coverage.assign_shortkeys = function () {
-    $("*[class*='shortkey_']").each(function (i, e) {
-        $.each($(e).attr("class").split(" "), function (i, c) {
-            if (/^shortkey_/.test(c)) {
-                $(document).bind('keydown', c.substr(9), function () {
-                    $(e).click();
-                });
-            }
-        });
-    });
+// General helpers
+function debounce(callback, wait) {
+    let timeoutId = null;
+    return function(...args) {
+        clearTimeout(timeoutId);
+        timeoutId = setTimeout(() => {
+            callback.apply(this, args);
+        }, wait);
+    };
 };
 
-// Create the events for the help panel.
-coverage.wire_up_help_panel = function () {
-    $("#keyboard_icon").click(function () {
-        // Show the help panel, and position it so the keyboard icon in the
-        // panel is in the same place as the keyboard icon in the header.
-        $(".help_panel").show();
-        var koff = $("#keyboard_icon").offset();
-        var poff = $("#panel_icon").position();
-        $(".help_panel").offset({
-            top: koff.top-poff.top-1,
-            left: koff.left-poff.left-1
+function checkVisible(element) {
+    var rect = element.getBoundingClientRect();
+    var viewHeight = Math.max(document.documentElement.clientHeight, window.innerHeight);
+    return !(rect.bottom < 0 || rect.top - viewHeight >= 0);
+}
+
+// Helpers for table sorting
+function getCellValue(row, column = 0) {
+    const cell = row.cells[column]
+    if (cell.childElementCount == 1) {
+        const child = cell.firstElementChild
+        if (child instanceof HTMLTimeElement && child.dateTime) {
+            return child.dateTime
+        } else if (child instanceof HTMLDataElement && child.value) {
+            return child.value
+        }
+    }
+    return cell.innerText || cell.textContent;
+}
+
+function rowComparator(rowA, rowB, column = 0) {
+    let valueA = getCellValue(rowA, column);
+    let valueB = getCellValue(rowB, column);
+    if (!isNaN(valueA) && !isNaN(valueB)) {
+        return valueA - valueB
+    }
+    return valueA.localeCompare(valueB, undefined, {numeric: true});
+}
+
+function sortColumn(th) {
+    // Get the current sorting direction of the selected header,
+    // clear state on other headers and then set the new sorting direction
+    const currentSortOrder = th.ariaSort;
+    [...th.parentElement.cells].forEach(header => header.ariaSort = "none");
+    if (currentSortOrder === "none") {
+        th.ariaSort = th.dataset.defaultSortOrder || "ascending"
+    } else {
+        th.ariaSort = currentSortOrder === "ascending" ? "descending" : "ascending";
+    }
+
+    const column = [...th.parentElement.cells].indexOf(th)
+
+    // Sort all rows and afterwards append them in order to move them in the DOM
+    Array.from(th.closest("table").querySelectorAll("tbody tr"))
+        .sort((rowA, rowB) => rowComparator(rowA, rowB, column) * (th.ariaSort === "ascending" ? 1 : -1))
+        .forEach(tr => tr.parentElement.appendChild(tr) );
+}
+
+// Find all the elements with data-shortcut attribute, and use them to assign a shortcut key.
+coverage.assign_shortkeys = function () {
+    document.querySelectorAll("[data-shortcut]").forEach(element => {
+        document.addEventListener("keypress", event => {
+            if (event.target.tagName.toLowerCase() === "input") {
+                return; // ignore keypress from search filter
+            }
+            if (event.key === element.dataset.shortcut) {
+                element.click();
+            }
         });
     });
-    $("#panel_icon").click(function () {
-        $(".help_panel").hide();
-    });
 };
 
 // Create the events for the filter box.
 coverage.wire_up_filter = function () {
     // Cache elements.
-    var table = $("table.index");
-    var table_rows = table.find("tbody tr");
-    var table_row_names = table_rows.find("td.name a");
-    var no_rows = $("#no_rows");
-
-    // Create a duplicate table footer that we can modify with dynamic summed values.
-    var table_footer = $("table.index tfoot tr");
-    var table_dynamic_footer = table_footer.clone();
-    table_dynamic_footer.attr('class', 'total_dynamic hidden');
-    table_footer.after(table_dynamic_footer);
+    const table = document.querySelector("table.index");
+    const table_body_rows = table.querySelectorAll("tbody tr");
+    const no_rows = document.getElementById("no_rows");
 
     // Observe filter keyevents.
-    $("#filter").on("keyup change", $.debounce(150, function (event) {
-        var filter_value = $(this).val();
-
-        if (filter_value === "") {
-            // Filter box is empty, remove all filtering.
-            table_rows.removeClass("hidden");
-
-            // Show standard footer, hide dynamic footer.
-            table_footer.removeClass("hidden");
-            table_dynamic_footer.addClass("hidden");
-
-            // Hide placeholder, show table.
-            if (no_rows.length > 0) {
-                no_rows.hide();
+    document.getElementById("filter").addEventListener("input", debounce(event => {
+        // Keep running total of each metric, first index contains number of shown rows
+        const totals = new Array(table.rows[0].cells.length).fill(0);
+        // Accumulate the percentage as fraction
+        totals[totals.length - 1] = { "numer": 0, "denom": 0 };
+
+        // Hide / show elements.
+        table_body_rows.forEach(row => {
+            if (!row.cells[0].textContent.includes(event.target.value)) {
+                // hide
+                row.classList.add("hidden");
+                return;
             }
-            table.show();
 
-        }
-        else {
-            // Filter table items by value.
-            var hidden = 0;
-            var shown = 0;
-
-            // Hide / show elements.
-            $.each(table_row_names, function () {
-                var element = $(this).parents("tr");
-
-                if ($(this).text().indexOf(filter_value) === -1) {
-                    // hide
-                    element.addClass("hidden");
-                    hidden++;
-                }
-                else {
-                    // show
-                    element.removeClass("hidden");
-                    shown++;
-                }
-            });
-
-            // Show placeholder if no rows will be displayed.
-            if (no_rows.length > 0) {
-                if (shown === 0) {
-                    // Show placeholder, hide table.
-                    no_rows.show();
-                    table.hide();
-                }
-                else {
-                    // Hide placeholder, show table.
-                    no_rows.hide();
-                    table.show();
+            // show
+            row.classList.remove("hidden");
+            totals[0]++;
+
+            for (let column = 1; column < totals.length; column++) {
+                // Accumulate dynamic totals
+                cell = row.cells[column]
+                if (column === totals.length - 1) {
+                    // Last column contains percentage
+                    const [numer, denom] = cell.dataset.ratio.split(" ");
+                    totals[column]["numer"] += parseInt(numer, 10);
+                    totals[column]["denom"] += parseInt(denom, 10);
+                } else {
+                    totals[column] += parseInt(cell.textContent, 10);
                 }
             }
+        });
 
-            // Manage dynamic header:
-            if (hidden > 0) {
-                // Calculate new dynamic sum values based on visible rows.
-                for (var column = 2; column < 20; column++) {
-                    // Calculate summed value.
-                    var cells = table_rows.find('td:nth-child(' + column + ')');
-                    if (!cells.length) {
-                        // No more columns...!
-                        break;
-                    }
-
-                    var sum = 0, numer = 0, denom = 0;
-                    $.each(cells.filter(':visible'), function () {
-                        var ratio = $(this).data("ratio");
-                        if (ratio) {
-                            var splitted = ratio.split(" ");
-                            numer += parseInt(splitted[0], 10);
-                            denom += parseInt(splitted[1], 10);
-                        }
-                        else {
-                            sum += parseInt(this.innerHTML, 10);
-                        }
-                    });
-
-                    // Get footer cell element.
-                    var footer_cell = table_dynamic_footer.find('td:nth-child(' + column + ')');
-
-                    // Set value into dynamic footer cell element.
-                    if (cells[0].innerHTML.indexOf('%') > -1) {
-                        // Percentage columns use the numerator and denominator,
-                        // and adapt to the number of decimal places.
-                        var match = /\.([0-9]+)/.exec(cells[0].innerHTML);
-                        var places = 0;
-                        if (match) {
-                            places = match[1].length;
-                        }
-                        var pct = numer * 100 / denom;
-                        footer_cell.text(pct.toFixed(places) + '%');
-                    }
-                    else {
-                        footer_cell.text(sum);
-                    }
-                }
+        console.log(totals)
 
-                // Hide standard footer, show dynamic footer.
-                table_footer.addClass("hidden");
-                table_dynamic_footer.removeClass("hidden");
-            }
-            else {
-                // Show standard footer, hide dynamic footer.
-                table_footer.removeClass("hidden");
-                table_dynamic_footer.addClass("hidden");
+        // Show placeholder if no rows will be displayed.
+        if (!totals[0]) {
+            // Show placeholder, hide table.
+            no_rows.style.display = "block";
+            table.style.display = "none";
+            return;
+        }
+
+        // Hide placeholder, show table.
+        no_rows.style.display = null;
+        table.style.display = null;
+
+        const footer = table.tFoot.rows[0];
+        // Calculate new dynamic sum values based on visible rows.
+        for (let column = 1; column < totals.length; column++) {
+            // Get footer cell element.
+            const cell = footer.cells[column];
+
+            // Set value into dynamic footer cell element.
+            if (column === totals.length - 1) {
+                // Percentage column uses the numerator and denominator,
+                // and adapts to the number of decimal places.
+                const match = /\.([0-9]+)/.exec(cell.textContent);
+                const places = match ? match[1].length : 0;
+                const { numer, denom } = totals[column];
+                cell.dataset.ratio = `${numer} ${denom}`;
+                // Check denom to prevent NaN if filtered files contain no statements
+                cell.textContent = denom
+                    ? `${(numer * 100 / denom).toFixed(places)}%`
+                    : `${(100).toFixed(places)}%`;
+            } else {
+                cell.textContent = totals[column];
             }
         }
     }));
 
     // Trigger change event on setup, to force filter on page refresh
     // (filter value may still be present).
-    $("#filter").trigger("change");
+    document.getElementById("filter").dispatchEvent(new Event("change"));
 };
 
+coverage.INDEX_SORT_STORAGE = "COVERAGE_INDEX_SORT";
+
 // Loaded on index.html
-coverage.index_ready = function ($) {
+coverage.index_ready = function () {
+    coverage.assign_shortkeys();
+    coverage.wire_up_filter();
+    document.querySelectorAll("[data-sortable] th[aria-sort]").forEach(
+        th => th.addEventListener("click", e => sortColumn(e.target))
+    );
+
     // Look for a localStorage item containing previous sort settings:
-    var sort_list = [];
-    var storage_name = "COVERAGE_INDEX_SORT";
-    var stored_list = undefined;
-    try {
-        stored_list = localStorage.getItem(storage_name);
-    } catch(err) {}
+    const stored_list = localStorage.getItem(coverage.INDEX_SORT_STORAGE);
 
     if (stored_list) {
-        sort_list = JSON.parse('[[' + stored_list + ']]');
-    }
-
-    // Create a new widget which exists only to save and restore
-    // the sort order:
-    $.tablesorter.addWidget({
-        id: "persistentSort",
-
-        // Format is called by the widget before displaying:
-        format: function (table) {
-            if (table.config.sortList.length === 0 && sort_list.length > 0) {
-                // This table hasn't been sorted before - we'll use
-                // our stored settings:
-                $(table).trigger('sorton', [sort_list]);
-            }
-            else {
-                // This is not the first load - something has
-                // already defined sorting so we'll just update
-                // our stored value to match:
-                sort_list = table.config.sortList;
-            }
-        }
-    });
-
-    // Configure our tablesorter to handle the variable number of
-    // columns produced depending on report options:
-    var headers = [];
-    var col_count = $("table.index > thead > tr > th").length;
-
-    headers[0] = { sorter: 'text' };
-    for (i = 1; i < col_count-1; i++) {
-        headers[i] = { sorter: 'digit' };
+        const {column, direction} = JSON.parse(stored_list);
+        const th = document.querySelector("[data-sortable]").tHead.rows[0].cells[column];
+        th.ariaSort = direction === "ascending" ? "descending" : "ascending";
+        th.click()
     }
-    headers[col_count-1] = { sorter: 'percent' };
-
-    // Enable the table sorter:
-    $("table.index").tablesorter({
-        widgets: ['persistentSort'],
-        headers: headers
-    });
-
-    coverage.assign_shortkeys();
-    coverage.wire_up_help_panel();
-    coverage.wire_up_filter();
 
     // Watch for page unload events so we can save the final sort settings:
-    $(window).on("unload", function () {
-        try {
-            localStorage.setItem(storage_name, sort_list.toString())
-        } catch(err) {}
+    window.addEventListener("unload", function () {
+        const th = document.querySelector('[data-sortable] th[aria-sort="ascending"], [data-sortable] [aria-sort="descending"]');
+        if (!th) {
+            return;
+        }
+        localStorage.setItem(coverage.INDEX_SORT_STORAGE, JSON.stringify({
+            column: [...th.parentElement.cells].indexOf(th),
+            direction: th.ariaSort,
+        }));
     });
 };
 
@@ -235,28 +200,25 @@ coverage.index_ready = function ($) {
 
 coverage.LINE_FILTERS_STORAGE = "COVERAGE_LINE_FILTERS";
 
-coverage.pyfile_ready = function ($) {
+coverage.pyfile_ready = function () {
     // If we're directed to a particular line number, highlight the line.
     var frag = location.hash;
     if (frag.length > 2 && frag[1] === 't') {
-        $(frag).addClass('highlight');
+        document.getElementById(frag.substring(1)).classList.add("highlight");
         coverage.set_sel(parseInt(frag.substr(2), 10));
-    }
-    else {
+    } else {
         coverage.set_sel(0);
     }
 
-    $(document)
-        .bind('keydown', 'j', coverage.to_next_chunk_nicely)
-        .bind('keydown', 'k', coverage.to_prev_chunk_nicely)
-        .bind('keydown', '0', coverage.to_top)
-        .bind('keydown', '1', coverage.to_first_chunk)
-        ;
+    document.querySelector(".button_toggle_run").addEventListener("click", coverage.toggle_lines);
+    document.querySelector(".button_toggle_mis").addEventListener("click", coverage.toggle_lines);
+    document.querySelector(".button_toggle_exc").addEventListener("click", coverage.toggle_lines);
+    document.querySelector(".button_toggle_par").addEventListener("click", coverage.toggle_lines);
 
-    $(".button_toggle_run").click(function (evt) {coverage.toggle_lines(evt.target, "run");});
-    $(".button_toggle_exc").click(function (evt) {coverage.toggle_lines(evt.target, "exc");});
-    $(".button_toggle_mis").click(function (evt) {coverage.toggle_lines(evt.target, "mis");});
-    $(".button_toggle_par").click(function (evt) {coverage.toggle_lines(evt.target, "par");});
+    document.querySelector(".button_next_chunk").addEventListener("click", coverage.to_next_chunk_nicely);
+    document.querySelector(".button_prev_chunk").addEventListener("click", coverage.to_prev_chunk_nicely);
+    document.querySelector(".button_top_of_page").addEventListener("click", coverage.to_top);
+    document.querySelector(".button_first_chunk").addEventListener("click", coverage.to_first_chunk);
 
     coverage.filters = undefined;
     try {
@@ -275,40 +237,41 @@ coverage.pyfile_ready = function ($) {
     }
 
     coverage.assign_shortkeys();
-    coverage.wire_up_help_panel();
     coverage.init_scroll_markers();
     coverage.wire_up_sticky_header();
 
     // Rebuild scroll markers when the window height changes.
-    $(window).resize(coverage.build_scroll_markers);
+    window.addEventListener("resize", coverage.build_scroll_markers);
 };
 
-coverage.toggle_lines = function (btn, cls) {
-    var onoff = !$(btn).hasClass("show_" + cls);
-    coverage.set_line_visibilty(cls, onoff);
+coverage.toggle_lines = function (event) {
+    const btn = event.target;
+    const category = btn.value
+    const show = !btn.classList.contains("show_" + category);
+    coverage.set_line_visibilty(category, show);
     coverage.build_scroll_markers();
-    coverage.filters[cls] = onoff;
+    coverage.filters[category] = show;
     try {
         localStorage.setItem(coverage.LINE_FILTERS_STORAGE, JSON.stringify(coverage.filters));
     } catch(err) {}
 };
 
-coverage.set_line_visibilty = function (cls, onoff) {
-    var show = "show_" + cls;
-    var btn = $(".button_toggle_" + cls);
-    if (onoff) {
-        $("#source ." + cls).addClass(show);
-        btn.addClass(show);
+coverage.set_line_visibilty = function (category, should_show) {
+    const cls = "show_" + category;
+    const btn = document.querySelector(".button_toggle_" + category);
+    if (should_show) {
+        document.querySelectorAll("#source ." + category).forEach(e => e.classList.add(cls));
+        btn.classList.add(cls);
     }
     else {
-        $("#source ." + cls).removeClass(show);
-        btn.removeClass(show);
+        document.querySelectorAll("#source ." + category).forEach(e => e.classList.remove(cls));
+        btn.classList.remove(cls);
     }
 };
 
 // Return the nth line div.
 coverage.line_elt = function (n) {
-    return $("#t" + n);
+    return document.getElementById("t" + n);
 };
 
 // Set the selection.  b and e are line numbers.
@@ -332,25 +295,26 @@ coverage.to_first_chunk = function () {
 // Return a string indicating what kind of chunk this line belongs to,
 // or null if not a chunk.
 coverage.chunk_indicator = function (line_elt) {
-    var klass = line_elt.attr('class');
-    if (klass) {
-        var m = klass.match(/\bshow_\w+\b/);
-        if (m) {
-            return m[0];
-        }
+    const classes = line_elt.className;
+    if (!classes) {
+        return null;
     }
-    return null;
+    const match = classes.match(/\bshow_\w+\b/);
+    if (!match) {
+        return null;
+    }
+    return match[0];
 };
 
 coverage.to_next_chunk = function () {
-    var c = coverage;
+    const c = coverage;
 
     // Find the start of the next colored chunk.
     var probe = c.sel_end;
     var chunk_indicator, probe_line;
     while (true) {
         probe_line = c.line_elt(probe);
-        if (probe_line.length === 0) {
+        if (!probe_line) {
             return;
         }
         chunk_indicator = c.chunk_indicator(probe_line);
@@ -375,7 +339,7 @@ coverage.to_next_chunk = function () {
 };
 
 coverage.to_prev_chunk = function () {
-    var c = coverage;
+    const c = coverage;
 
     // Find the end of the prev colored chunk.
     var probe = c.sel_begin-1;
@@ -387,7 +351,7 @@ coverage.to_prev_chunk = function () {
     while (probe > 0 && !chunk_indicator) {
         probe--;
         probe_line = c.line_elt(probe);
-        if (probe_line.length === 0) {
+        if (!probe_line) {
             return;
         }
         chunk_indicator = c.chunk_indicator(probe_line);
@@ -407,28 +371,6 @@ coverage.to_prev_chunk = function () {
     c.show_selection();
 };
 
-// Return the line number of the line nearest pixel position pos
-coverage.line_at_pos = function (pos) {
-    var l1 = coverage.line_elt(1),
-        l2 = coverage.line_elt(2),
-        result;
-    if (l1.length && l2.length) {
-        var l1_top = l1.offset().top,
-            line_height = l2.offset().top - l1_top,
-            nlines = (pos - l1_top) / line_height;
-        if (nlines < 1) {
-            result = 1;
-        }
-        else {
-            result = Math.ceil(nlines);
-        }
-    }
-    else {
-        result = 1;
-    }
-    return result;
-};
-
 // Returns 0, 1, or 2: how many of the two ends of the selection are on
 // the screen right now?
 coverage.selection_ends_on_screen = function () {
@@ -436,31 +378,49 @@ coverage.selection_ends_on_screen = function () {
         return 0;
     }
 
-    var top = coverage.line_elt(coverage.sel_begin);
-    var next = coverage.line_elt(coverage.sel_end-1);
+    const begin = coverage.line_elt(coverage.sel_begin);
+    const end = coverage.line_elt(coverage.sel_end-1);
 
     return (
-        (top.isOnScreen() ? 1 : 0) +
-        (next.isOnScreen() ? 1 : 0)
+        (checkVisible(begin) ? 1 : 0)
+        + (checkVisible(end) ? 1 : 0)
     );
 };
 
 coverage.to_next_chunk_nicely = function () {
-    coverage.finish_scrolling();
     if (coverage.selection_ends_on_screen() === 0) {
-        // The selection is entirely off the screen: select the top line on
-        // the screen.
-        var win = $(window);
-        coverage.select_line_or_chunk(coverage.line_at_pos(win.scrollTop()));
+        // The selection is entirely off the screen:
+        // Set the top line on the screen as selection.
+
+        // This will select the top-left of the viewport
+        // As this is most likely the span with the line number we take the parent
+        const line = document.elementFromPoint(0, 0).parentElement;
+        if (line.parentElement !== document.getElementById("source")) {
+            // The element is not a source line but the header or similar
+            coverage.select_line_or_chunk(1);
+        } else {
+            // We extract the line number from the id
+            coverage.select_line_or_chunk(parseInt(line.id.substring(1), 10));
+        }
     }
     coverage.to_next_chunk();
 };
 
 coverage.to_prev_chunk_nicely = function () {
-    coverage.finish_scrolling();
     if (coverage.selection_ends_on_screen() === 0) {
-        var win = $(window);
-        coverage.select_line_or_chunk(coverage.line_at_pos(win.scrollTop() + win.height()));
+        // The selection is entirely off the screen:
+        // Set the lowest line on the screen as selection.
+
+        // This will select the bottom-left of the viewport
+        // As this is most likely the span with the line number we take the parent
+        const line = document.elementFromPoint(document.documentElement.clientHeight-1, 0).parentElement;
+        if (line.parentElement !== document.getElementById("source")) {
+            // The element is not a source line but the header or similar
+            coverage.select_line_or_chunk(coverage.lines_len);
+        } else {
+            // We extract the line number from the id
+            coverage.select_line_or_chunk(parseInt(line.id.substring(1), 10));
+        }
     }
     coverage.to_prev_chunk();
 };
@@ -506,108 +466,75 @@ coverage.select_line_or_chunk = function (lineno) {
 };
 
 coverage.show_selection = function () {
-    var c = coverage;
-
     // Highlight the lines in the chunk
-    $("#source .highlight").removeClass("highlight");
-    for (var probe = c.sel_begin; probe > 0 && probe < c.sel_end; probe++) {
-        c.line_elt(probe).addClass("highlight");
+    document.querySelectorAll("#source .highlight").forEach(e => e.classList.remove("highlight"));
+    for (let probe = coverage.sel_begin; probe < coverage.sel_end; probe++) {
+        coverage.line_elt(probe).classList.add("highlight");
     }
 
-    c.scroll_to_selection();
+    coverage.scroll_to_selection();
 };
 
 coverage.scroll_to_selection = function () {
     // Scroll the page if the chunk isn't fully visible.
     if (coverage.selection_ends_on_screen() < 2) {
-        // Need to move the page. The html,body trick makes it scroll in all
-        // browsers, got it from http://stackoverflow.com/questions/3042651
-        var top = coverage.line_elt(coverage.sel_begin);
-        var top_pos = parseInt(top.offset().top, 10);
-        coverage.scroll_window(top_pos - 30);
+        const element = coverage.line_elt(coverage.sel_begin);
+        coverage.scroll_window(element.offsetTop - 30);
     }
 };
 
 coverage.scroll_window = function (to_pos) {
-    $("html,body").animate({scrollTop: to_pos}, 200);
-};
-
-coverage.finish_scrolling = function () {
-    $("html,body").stop(true, true);
+    window.scroll({top: to_pos, behavior: "smooth"});
 };
 
 coverage.init_scroll_markers = function () {
-    var c = coverage;
     // Init some variables
-    c.lines_len = $('#source p').length;
-    c.body_h = $('body').height();
-    c.header_h = $('div#header').height();
+    coverage.lines_len = document.querySelectorAll('#source > p').length;
 
     // Build html
-    c.build_scroll_markers();
+    coverage.build_scroll_markers();
 };
 
 coverage.build_scroll_markers = function () {
-    var c = coverage,
-        min_line_height = 3,
-        max_line_height = 10,
-        visible_window_h = $(window).height();
-
-    c.lines_to_mark = $('#source').find('p.show_run, p.show_mis, p.show_exc, p.show_exc, p.show_par');
-    $('#scroll_marker').remove();
+    const temp_scroll_marker = document.getElementById('scroll_marker')
+    if (temp_scroll_marker) temp_scroll_marker.remove();
     // Don't build markers if the window has no scroll bar.
-    if (c.body_h <= visible_window_h) {
+    if (document.body.scrollHeight <= window.innerHeight) {
         return;
     }
 
-    $("body").append("<div id='scroll_marker'>&nbsp;</div>");
-    var scroll_marker = $('#scroll_marker'),
-        marker_scale = scroll_marker.height() / c.body_h,
-        line_height = scroll_marker.height() / c.lines_len;
+    const marker_scale = window.innerHeight / document.body.scrollHeight;
+    const line_height = Math.min(Math.max(3, window.innerHeight / coverage.lines_len), 10);
 
-    // Line height must be between the extremes.
-    if (line_height > min_line_height) {
-        if (line_height > max_line_height) {
-            line_height = max_line_height;
-        }
-    }
-    else {
-        line_height = min_line_height;
-    }
+    let previous_line = -99, last_mark, last_top;
 
-    var previous_line = -99,
-        last_mark,
-        last_top,
-        offsets = {};
-
-    // Calculate line offsets outside loop to prevent relayouts
-    c.lines_to_mark.each(function() {
-        offsets[this.id] = $(this).offset().top;
-    });
-    c.lines_to_mark.each(function () {
-        var id_name = $(this).attr('id'),
-            line_top = Math.round(offsets[id_name] * marker_scale),
-            line_number = parseInt(id_name.substring(1, id_name.length));
+    const scroll_marker = document.createElement("div");
+    scroll_marker.id = "scroll_marker";
+    document.getElementById('source').querySelectorAll(
+        'p.show_run, p.show_mis, p.show_exc, p.show_exc, p.show_par'
+    ).forEach(element => {
+        const line_top = Math.floor(element.offsetTop * marker_scale);
+        const line_number = parseInt(element.id.substr(1));
 
         if (line_number === previous_line + 1) {
             // If this solid missed block just make previous mark higher.
-            last_mark.css({
-                'height': line_top + line_height - last_top
-            });
-        }
-        else {
+            last_mark.style.height = `${line_top + line_height - last_top}px`;
+        } else {
             // Add colored line in scroll_marker block.
-            scroll_marker.append('<div id="m' + line_number + '" class="marker"></div>');
-            last_mark = $('#m' + line_number);
-            last_mark.css({
-                'height': line_height,
-                'top': line_top
-            });
+            last_mark = document.createElement("div");
+            last_mark.id = `m${line_number}`;
+            last_mark.classList.add("marker");
+            last_mark.style.height = `${line_height}px`;
+            last_mark.style.top = `${line_top}px`;
+            scroll_marker.append(last_mark);
             last_top = line_top;
         }
 
         previous_line = line_number;
     });
+
+    // Append last to prevent layout calculation
+    document.body.append(scroll_marker);
 };
 
 coverage.wire_up_sticky_header = function () {
@@ -628,3 +555,11 @@ coverage.wire_up_sticky_header = function () {
     window.addEventListener('scroll', updateHeader);
     updateHeader();
 };
+
+document.addEventListener("DOMContentLoaded", () => {
+    if (document.body.classList.contains("indexfile")) {
+        coverage.index_ready();
+    } else {
+        coverage.pyfile_ready();
+    }
+});
diff --git a/coverage/htmlfiles/index.html b/coverage/htmlfiles/index.html
index b5d2bcd1e..e1d3e9b59 100644
--- a/coverage/htmlfiles/index.html
+++ b/coverage/htmlfiles/index.html
@@ -11,14 +11,7 @@
     {% if extra_css %}
         <link rel="stylesheet" href="{{ extra_css }}" type="text/css">
     {% endif %}
-    <script type="text/javascript" src="jquery.min.js"></script>
-    <script type="text/javascript" src="jquery.ba-throttle-debounce.min.js"></script>
-    <script type="text/javascript" src="jquery.tablesorter.min.js"></script>
-    <script type="text/javascript" src="jquery.hotkeys.js"></script>
-    <script type="text/javascript" src="coverage_html.js"></script>
-    <script type="text/javascript">
-        jQuery(document).ready(coverage.index_ready);
-    </script>
+    <script type="text/javascript" src="coverage_html.js" defer></script>
 </head>
 <body class="indexfile">
 
@@ -28,7 +21,28 @@ <h1>{{ title|escape }}:
             <span class="pc_cov">{{totals.pc_covered_str}}%</span>
         </h1>
 
-        <img id="keyboard_icon" src="keybd_closed.png" alt="Show keyboard shortcuts" />
+        <div id="help_panel_wrapper">
+            <input id="help_panel_state" type="checkbox">
+            <label for="help_panel_state">
+                <img id="keyboard_icon" src="keybd_closed.png" alt="Show/hide keyboard shortcuts" />
+            </label>
+            <div id="help_panel">
+                <p class="legend">Shortcuts on this page</p>
+                <div>
+                    <p class="keyhelp">
+                        <kbd>n</kbd>
+                        <kbd>s</kbd>
+                        <kbd>m</kbd>
+                        <kbd>x</kbd>
+                        {% if has_arcs %}
+                        <kbd>b</kbd>
+                        <kbd>p</kbd>
+                        {% endif %}
+                        <kbd>c</kbd> &nbsp; change column sorting
+                    </p>
+                </div>
+            </div>
+        </div>
 
         <form id="filter_container">
             <input id="filter" type="text" value="" placeholder="filter..." />
@@ -36,54 +50,22 @@ <h1>{{ title|escape }}:
     </div>
 </header>
 
-<aside class="help_panel">
-    <img id="panel_icon" src="keybd_open.png" alt="Hide keyboard shortcuts" />
-    <p class="legend">Hot-keys on this page</p>
-    <div>
-    <p class="keyhelp">
-        <span class="key">n</span>
-        <span class="key">s</span>
-        <span class="key">m</span>
-        <span class="key">x</span>
-        {% if has_arcs %}
-        <span class="key">b</span>
-        <span class="key">p</span>
-        {% endif %}
-        <span class="key">c</span> &nbsp; change column sorting
-    </p>
-    </div>
-</aside>
-
 <main id="index">
-    <table class="index">
+    <table class="index" data-sortable>
         <thead>
             {# The title="" attr doesn"t work in Safari. #}
             <tr class="tablehead" title="Click to sort">
-                <th class="name left headerSortDown shortkey_n">Module</th>
-                <th class="shortkey_s">statements</th>
-                <th class="shortkey_m">missing</th>
-                <th class="shortkey_x">excluded</th>
+                <th class="name left" aria-sort="none" data-shortcut="n">Module</th>
+                <th aria-sort="none" data-default-sort-order="descending" data-shortcut="s">statements</th>
+                <th aria-sort="none" data-default-sort-order="descending" data-shortcut="m">missing</th>
+                <th aria-sort="none" data-default-sort-order="descending" data-shortcut="x">excluded</th>
                 {% if has_arcs %}
-                <th class="shortkey_b">branches</th>
-                <th class="shortkey_p">partial</th>
+                <th aria-sort="none" data-default-sort-order="descending" data-shortcut="b">branches</th>
+                <th aria-sort="none" data-default-sort-order="descending" data-shortcut="p">partial</th>
                 {% endif %}
-                <th class="right shortkey_c">coverage</th>
+                <th class="right" aria-sort="none" data-shortcut="c">coverage</th>
             </tr>
         </thead>
-        {# HTML syntax requires thead, tfoot, tbody #}
-        <tfoot>
-            <tr class="total">
-                <td class="name left">Total</td>
-                <td>{{totals.n_statements}}</td>
-                <td>{{totals.n_missing}}</td>
-                <td>{{totals.n_excluded}}</td>
-                {% if has_arcs %}
-                <td>{{totals.n_branches}}</td>
-                <td>{{totals.n_partial_branches}}</td>
-                {% endif %}
-                <td class="right" data-ratio="{{totals.ratio_covered|pair}}">{{totals.pc_covered_str}}%</td>
-            </tr>
-        </tfoot>
         <tbody>
             {% for file in files %}
             <tr class="file">
@@ -99,6 +81,19 @@ <h1>{{ title|escape }}:
             </tr>
             {% endfor %}
         </tbody>
+        <tfoot>
+            <tr class="total">
+                <td class="name left">Total</td>
+                <td>{{totals.n_statements}}</td>
+                <td>{{totals.n_missing}}</td>
+                <td>{{totals.n_excluded}}</td>
+                {% if has_arcs %}
+                <td>{{totals.n_branches}}</td>
+                <td>{{totals.n_partial_branches}}</td>
+                {% endif %}
+                <td class="right" data-ratio="{{totals.ratio_covered|pair}}">{{totals.pc_covered_str}}%</td>
+            </tr>
+        </tfoot>
     </table>
 
     <p id="no_rows">
diff --git a/coverage/htmlfiles/jquery.ba-throttle-debounce.min.js b/coverage/htmlfiles/jquery.ba-throttle-debounce.min.js
deleted file mode 100644
index 648fe5d3c..000000000
--- a/coverage/htmlfiles/jquery.ba-throttle-debounce.min.js
+++ /dev/null
@@ -1,9 +0,0 @@
-/*
- * jQuery throttle / debounce - v1.1 - 3/7/2010
- * http://benalman.com/projects/jquery-throttle-debounce-plugin/
- *
- * Copyright (c) 2010 "Cowboy" Ben Alman
- * Dual licensed under the MIT and GPL licenses.
- * http://benalman.com/about/license/
- */
-(function(b,c){var $=b.jQuery||b.Cowboy||(b.Cowboy={}),a;$.throttle=a=function(e,f,j,i){var h,d=0;if(typeof f!=="boolean"){i=j;j=f;f=c}function g(){var o=this,m=+new Date()-d,n=arguments;function l(){d=+new Date();j.apply(o,n)}function k(){h=c}if(i&&!h){l()}h&&clearTimeout(h);if(i===c&&m>e){l()}else{if(f!==true){h=setTimeout(i?k:l,i===c?e-m:e)}}}if($.guid){g.guid=j.guid=j.guid||$.guid++}return g};$.debounce=function(d,e,f){return f===c?a(d,e,false):a(d,f,e!==false)}})(this);
diff --git a/coverage/htmlfiles/jquery.hotkeys.js b/coverage/htmlfiles/jquery.hotkeys.js
deleted file mode 100644
index 09b21e03c..000000000
--- a/coverage/htmlfiles/jquery.hotkeys.js
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
- * jQuery Hotkeys Plugin
- * Copyright 2010, John Resig
- * Dual licensed under the MIT or GPL Version 2 licenses.
- *
- * Based upon the plugin by Tzury Bar Yochay:
- * http://github.com/tzuryby/hotkeys
- *
- * Original idea by:
- * Binny V A, http://www.openjs.com/scripts/events/keyboard_shortcuts/
-*/
-
-(function(jQuery){
-
-	jQuery.hotkeys = {
-		version: "0.8",
-
-		specialKeys: {
-			8: "backspace", 9: "tab", 13: "return", 16: "shift", 17: "ctrl", 18: "alt", 19: "pause",
-			20: "capslock", 27: "esc", 32: "space", 33: "pageup", 34: "pagedown", 35: "end", 36: "home",
-			37: "left", 38: "up", 39: "right", 40: "down", 45: "insert", 46: "del",
-			96: "0", 97: "1", 98: "2", 99: "3", 100: "4", 101: "5", 102: "6", 103: "7",
-			104: "8", 105: "9", 106: "*", 107: "+", 109: "-", 110: ".", 111 : "/",
-			112: "f1", 113: "f2", 114: "f3", 115: "f4", 116: "f5", 117: "f6", 118: "f7", 119: "f8",
-			120: "f9", 121: "f10", 122: "f11", 123: "f12", 144: "numlock", 145: "scroll", 191: "/", 224: "meta"
-		},
-
-		shiftNums: {
-			"`": "~", "1": "!", "2": "@", "3": "#", "4": "$", "5": "%", "6": "^", "7": "&",
-			"8": "*", "9": "(", "0": ")", "-": "_", "=": "+", ";": ": ", "'": "\"", ",": "<",
-			".": ">",  "/": "?",  "\\": "|"
-		}
-	};
-
-	function keyHandler( handleObj ) {
-		// Only care when a possible input has been specified
-		if ( typeof handleObj.data !== "string" ) {
-			return;
-		}
-
-		var origHandler = handleObj.handler,
-			keys = handleObj.data.toLowerCase().split(" ");
-
-		handleObj.handler = function( event ) {
-			// Don't fire in text-accepting inputs that we didn't directly bind to
-			if ( this !== event.target && (/textarea|select/i.test( event.target.nodeName ) ||
-				 event.target.type === "text") ) {
-				return;
-			}
-
-			// Keypress represents characters, not special keys
-			var special = event.type !== "keypress" && jQuery.hotkeys.specialKeys[ event.which ],
-				character = String.fromCharCode( event.which ).toLowerCase(),
-				key, modif = "", possible = {};
-
-			// check combinations (alt|ctrl|shift+anything)
-			if ( event.altKey && special !== "alt" ) {
-				modif += "alt+";
-			}
-
-			if ( event.ctrlKey && special !== "ctrl" ) {
-				modif += "ctrl+";
-			}
-
-			// TODO: Need to make sure this works consistently across platforms
-			if ( event.metaKey && !event.ctrlKey && special !== "meta" ) {
-				modif += "meta+";
-			}
-
-			if ( event.shiftKey && special !== "shift" ) {
-				modif += "shift+";
-			}
-
-			if ( special ) {
-				possible[ modif + special ] = true;
-
-			} else {
-				possible[ modif + character ] = true;
-				possible[ modif + jQuery.hotkeys.shiftNums[ character ] ] = true;
-
-				// "$" can be triggered as "Shift+4" or "Shift+$" or just "$"
-				if ( modif === "shift+" ) {
-					possible[ jQuery.hotkeys.shiftNums[ character ] ] = true;
-				}
-			}
-
-			for ( var i = 0, l = keys.length; i < l; i++ ) {
-				if ( possible[ keys[i] ] ) {
-					return origHandler.apply( this, arguments );
-				}
-			}
-		};
-	}
-
-	jQuery.each([ "keydown", "keyup", "keypress" ], function() {
-		jQuery.event.special[ this ] = { add: keyHandler };
-	});
-
-})( jQuery );
diff --git a/coverage/htmlfiles/jquery.isonscreen.js b/coverage/htmlfiles/jquery.isonscreen.js
deleted file mode 100644
index 28fb99bc6..000000000
--- a/coverage/htmlfiles/jquery.isonscreen.js
+++ /dev/null
@@ -1,53 +0,0 @@
-/* Copyright (c) 2010
- * @author Laurence Wheway
- * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
- * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
- *
- * @version 1.2.0
- */
-(function($) {
-	jQuery.extend({
-		isOnScreen: function(box, container) {
-			//ensure numbers come in as integers (not strings) and remove 'px' is it's there
-			for(var i in box){box[i] = parseFloat(box[i])};
-			for(var i in container){container[i] = parseFloat(container[i])};
-
-			if(!container){
-				container = {
-					left: $(window).scrollLeft(),
-					top: $(window).scrollTop(),
-					width: $(window).width(),
-					height: $(window).height()
-				}
-			}
-
-			if(	box.left+box.width-container.left > 0 &&
-				box.left < container.width+container.left &&
-				box.top+box.height-container.top > 0 &&
-				box.top < container.height+container.top
-			) return true;
-			return false;
-		}
-	})
-
-
-	jQuery.fn.isOnScreen = function (container) {
-		for(var i in container){container[i] = parseFloat(container[i])};
-
-		if(!container){
-			container = {
-				left: $(window).scrollLeft(),
-				top: $(window).scrollTop(),
-				width: $(window).width(),
-				height: $(window).height()
-			}
-		}
-
-		if(	$(this).offset().left+$(this).width()-container.left > 0 &&
-			$(this).offset().left < container.width+container.left &&
-			$(this).offset().top+$(this).height()-container.top > 0 &&
-			$(this).offset().top < container.height+container.top
-		) return true;
-		return false;
-	}
-})(jQuery);
diff --git a/coverage/htmlfiles/jquery.min.js b/coverage/htmlfiles/jquery.min.js
deleted file mode 100644
index c4c6022f2..000000000
--- a/coverage/htmlfiles/jquery.min.js
+++ /dev/null
@@ -1,2 +0,0 @@
-/*! jQuery v3.6.0 | (c) OpenJS Foundation and other contributors | jquery.org/license */
-!function(e,t){"use strict";"object"==typeof module&&"object"==typeof module.exports?module.exports=e.document?t(e,!0):function(e){if(!e.document)throw new Error("jQuery requires a window with a document");return t(e)}:t(e)}("undefined"!=typeof window?window:this,function(C,e){"use strict";var t=[],r=Object.getPrototypeOf,s=t.slice,g=t.flat?function(e){return t.flat.call(e)}:function(e){return t.concat.apply([],e)},u=t.push,i=t.indexOf,n={},o=n.toString,v=n.hasOwnProperty,a=v.toString,l=a.call(Object),y={},m=function(e){return"function"==typeof e&&"number"!=typeof e.nodeType&&"function"!=typeof e.item},x=function(e){return null!=e&&e===e.window},E=C.document,c={type:!0,src:!0,nonce:!0,noModule:!0};function b(e,t,n){var r,i,o=(n=n||E).createElement("script");if(o.text=e,t)for(r in c)(i=t[r]||t.getAttribute&&t.getAttribute(r))&&o.setAttribute(r,i);n.head.appendChild(o).parentNode.removeChild(o)}function w(e){return null==e?e+"":"object"==typeof e||"function"==typeof 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diff --git a/coverage/htmlfiles/jquery.tablesorter.min.js b/coverage/htmlfiles/jquery.tablesorter.min.js
deleted file mode 100644
index 64c700712..000000000
--- a/coverage/htmlfiles/jquery.tablesorter.min.js
+++ /dev/null
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td",table.tBodies[0]).each(function(){colgroup.append($('<col>').css('width',$(this).width()));});$(table).prepend(colgroup);};}function updateHeaderSortCount(table,sortList){var c=table.config,l=sortList.length;for(var i=0;i<l;i++){var s=sortList[i],o=c.headerList[s[0]];o.count=s[1];o.count++;}}function multisort(table,sortList,cache){if(table.config.debug){var sortTime=new Date();}var dynamicExp="var sortWrapper = function(a,b) {",l=sortList.length;for(var i=0;i<l;i++){var c=sortList[i][0];var order=sortList[i][1];var s=(getCachedSortType(table.config.parsers,c)=="text")?((order==0)?"sortText":"sortTextDesc"):((order==0)?"sortNumeric":"sortNumericDesc");var e="e"+i;dynamicExp+="var "+e+" = "+s+"(a["+c+"],b["+c+"]); ";dynamicExp+="if("+e+") { return "+e+"; } ";dynamicExp+="else { ";}var orgOrderCol=cache.normalized[0].length-1;dynamicExp+="return a["+orgOrderCol+"]-b["+orgOrderCol+"];";for(var i=0;i<l;i++){dynamicExp+="}; ";}dynamicExp+="return 0; ";dynamicExp+="}; ";eval(dynamicExp);cache.normalized.sort(sortWrapper);if(table.config.debug){benchmark("Sorting on "+sortList.toString()+" and dir "+order+" time:",sortTime);}return cache;};function sortText(a,b){return((a<b)?-1:((a>b)?1:0));};function sortTextDesc(a,b){return((b<a)?-1:((b>a)?1:0));};function sortNumeric(a,b){return a-b;};function sortNumericDesc(a,b){return b-a;};function getCachedSortType(parsers,i){return parsers[i].type;};this.construct=function(settings){return this.each(function(){if(!this.tHead||!this.tBodies)return;var $this,$document,$headers,cache,config,shiftDown=0,sortOrder;this.config={};config=$.extend(this.config,$.tablesorter.defaults,settings);$this=$(this);$headers=buildHeaders(this);this.config.parsers=buildParserCache(this,$headers);cache=buildCache(this);var sortCSS=[config.cssDesc,config.cssAsc];fixColumnWidth(this);$headers.click(function(e){$this.trigger("sortStart");var totalRows=($this[0].tBodies[0]&&$this[0].tBodies[0].rows.length)||0;if(!this.sortDisabled&&totalRows>0){var $cell=$(this);var i=this.column;this.order=this.count++%2;if(!e[config.sortMultiSortKey]){config.sortList=[];if(config.sortForce!=null){var a=config.sortForce;for(var j=0;j<a.length;j++){if(a[j][0]!=i){config.sortList.push(a[j]);}}}config.sortList.push([i,this.order]);}else{if(isValueInArray(i,config.sortList)){for(var j=0;j<config.sortList.length;j++){var s=config.sortList[j],o=config.headerList[s[0]];if(s[0]==i){o.count=s[1];o.count++;s[1]=o.count%2;}}}else{config.sortList.push([i,this.order]);}};setTimeout(function(){setHeadersCss($this[0],$headers,config.sortList,sortCSS);appendToTable($this[0],multisort($this[0],config.sortList,cache));},1);return false;}}).mousedown(function(){if(config.cancelSelection){this.onselectstart=function(){return false};return false;}});$this.bind("update",function(){this.config.parsers=buildParserCache(this,$headers);cache=buildCache(this);}).bind("sorton",function(e,list){$(this).trigger("sortStart");config.sortList=list;var sortList=config.sortList;updateHeaderSortCount(this,sortList);setHeadersCss(this,$headers,sortList,sortCSS);appendToTable(this,multisort(this,sortList,cache));}).bind("appendCache",function(){appendToTable(this,cache);}).bind("applyWidgetId",function(e,id){getWidgetById(id).format(this);}).bind("applyWidgets",function(){applyWidget(this);});if($.metadata&&($(this).metadata()&&$(this).metadata().sortlist)){config.sortList=$(this).metadata().sortlist;}if(config.sortList.length>0){$this.trigger("sorton",[config.sortList]);}applyWidget(this);});};this.addParser=function(parser){var l=parsers.length,a=true;for(var i=0;i<l;i++){if(parsers[i].id.toLowerCase()==parser.id.toLowerCase()){a=false;}}if(a){parsers.push(parser);};};this.addWidget=function(widget){widgets.push(widget);};this.formatFloat=function(s){var i=parseFloat(s);return(isNaN(i))?0:i;};this.formatInt=function(s){var i=parseInt(s);return(isNaN(i))?0:i;};this.isDigit=function(s,config){var DECIMAL='\\'+config.decimal;var exp='/(^[+]?0('+DECIMAL+'0+)?$)|(^([-+]?[1-9][0-9]*)$)|(^([-+]?((0?|[1-9][0-9]*)'+DECIMAL+'(0*[1-9][0-9]*)))$)|(^[-+]?[1-9]+[0-9]*'+DECIMAL+'0+$)/';return RegExp(exp).test($.trim(s));};this.clearTableBody=function(table){if($.browser.msie){function empty(){while(this.firstChild)this.removeChild(this.firstChild);}empty.apply(table.tBodies[0]);}else{table.tBodies[0].innerHTML="";}};}});$.fn.extend({tablesorter:$.tablesorter.construct});var ts=$.tablesorter;ts.addParser({id:"text",is:function(s){return true;},format:function(s){return $.trim(s.toLowerCase());},type:"text"});ts.addParser({id:"digit",is:function(s,table){var c=table.config;return $.tablesorter.isDigit(s,c);},format:function(s){return $.tablesorter.formatFloat(s);},type:"numeric"});ts.addParser({id:"currency",is:function(s){return/^[£$€?.]/.test(s);},format:function(s){return $.tablesorter.formatFloat(s.replace(new RegExp(/[^0-9.]/g),""));},type:"numeric"});ts.addParser({id:"ipAddress",is:function(s){return/^\d{2,3}[\.]\d{2,3}[\.]\d{2,3}[\.]\d{2,3}$/.test(s);},format:function(s){var a=s.split("."),r="",l=a.length;for(var i=0;i<l;i++){var item=a[i];if(item.length==2){r+="0"+item;}else{r+=item;}}return $.tablesorter.formatFloat(r);},type:"numeric"});ts.addParser({id:"url",is:function(s){return/^(https?|ftp|file):\/\/$/.test(s);},format:function(s){return jQuery.trim(s.replace(new RegExp(/(https?|ftp|file):\/\//),''));},type:"text"});ts.addParser({id:"isoDate",is:function(s){return/^\d{4}[\/-]\d{1,2}[\/-]\d{1,2}$/.test(s);},format:function(s){return $.tablesorter.formatFloat((s!="")?new Date(s.replace(new RegExp(/-/g),"/")).getTime():"0");},type:"numeric"});ts.addParser({id:"percent",is:function(s){return/\%$/.test($.trim(s));},format:function(s){return $.tablesorter.formatFloat(s.replace(new RegExp(/%/g),""));},type:"numeric"});ts.addParser({id:"usLongDate",is:function(s){return s.match(new RegExp(/^[A-Za-z]{3,10}\.? [0-9]{1,2}, ([0-9]{4}|'?[0-9]{2}) (([0-2]?[0-9]:[0-5][0-9])|([0-1]?[0-9]:[0-5][0-9]\s(AM|PM)))$/));},format:function(s){return $.tablesorter.formatFloat(new Date(s).getTime());},type:"numeric"});ts.addParser({id:"shortDate",is:function(s){return/\d{1,2}[\/\-]\d{1,2}[\/\-]\d{2,4}/.test(s);},format:function(s,table){var c=table.config;s=s.replace(/\-/g,"/");if(c.dateFormat=="us"){s=s.replace(/(\d{1,2})[\/\-](\d{1,2})[\/\-](\d{4})/,"$3/$1/$2");}else if(c.dateFormat=="uk"){s=s.replace(/(\d{1,2})[\/\-](\d{1,2})[\/\-](\d{4})/,"$3/$2/$1");}else if(c.dateFormat=="dd/mm/yy"||c.dateFormat=="dd-mm-yy"){s=s.replace(/(\d{1,2})[\/\-](\d{1,2})[\/\-](\d{2})/,"$1/$2/$3");}return $.tablesorter.formatFloat(new Date(s).getTime());},type:"numeric"});ts.addParser({id:"time",is:function(s){return/^(([0-2]?[0-9]:[0-5][0-9])|([0-1]?[0-9]:[0-5][0-9]\s(am|pm)))$/.test(s);},format:function(s){return $.tablesorter.formatFloat(new Date("2000/01/01 "+s).getTime());},type:"numeric"});ts.addParser({id:"metadata",is:function(s){return false;},format:function(s,table,cell){var c=table.config,p=(!c.parserMetadataName)?'sortValue':c.parserMetadataName;return $(cell).metadata()[p];},type:"numeric"});ts.addWidget({id:"zebra",format:function(table){if(table.config.debug){var time=new Date();}$("tr:visible",table.tBodies[0]).filter(':even').removeClass(table.config.widgetZebra.css[1]).addClass(table.config.widgetZebra.css[0]).end().filter(':odd').removeClass(table.config.widgetZebra.css[0]).addClass(table.config.widgetZebra.css[1]);if(table.config.debug){$.tablesorter.benchmark("Applying Zebra widget",time);}}});})(jQuery);
\ No newline at end of file
diff --git a/coverage/htmlfiles/pyfile.html b/coverage/htmlfiles/pyfile.html
index 54e21708f..523f84839 100644
--- a/coverage/htmlfiles/pyfile.html
+++ b/coverage/htmlfiles/pyfile.html
@@ -14,59 +14,63 @@
     {% if extra_css %}
         <link rel="stylesheet" href="{{ extra_css }}" type="text/css">
     {% endif %}
-    <script type="text/javascript" src="jquery.min.js"></script>
-    <script type="text/javascript" src="jquery.hotkeys.js"></script>
-    <script type="text/javascript" src="jquery.isonscreen.js"></script>
-    <script type="text/javascript" src="coverage_html.js"></script>
-    <script type="text/javascript">
-        jQuery(document).ready(coverage.pyfile_ready);
-    </script>
+    <script type="text/javascript" src="coverage_html.js" defer></script>
 </head>
 <body class="pyfile">
 
 <header>
     <div class="content">
         <h1>
-            <span class="text">Coverage for </span><b>{{relative_filename|escape}}</b> :
+            <span class="text">Coverage for </span><b>{{relative_filename|escape}}</b>:
             <span class="pc_cov">{{nums.pc_covered_str}}%</span>
         </h1>
 
-        <img id="keyboard_icon" src="keybd_closed.png" alt="Show keyboard shortcuts" />
+        <div id="help_panel_wrapper">
+            <input id="help_panel_state" type="checkbox">
+            <label for="help_panel_state">
+                <img id="keyboard_icon" src="keybd_closed.png" alt="Show/hide keyboard shortcuts" />
+            </label>
+            <div id="help_panel">
+                <p class="legend">Shortcuts on this page</p>
+                <div>
+                    <p class="keyhelp">
+                        <kbd>r</kbd>
+                        <kbd>m</kbd>
+                        <kbd>x</kbd>
+                        <kbd>p</kbd> &nbsp; toggle line displays
+                    </p>
+                    <p class="keyhelp">
+                        <kbd>j</kbd>
+                        <kbd>k</kbd> &nbsp; next/prev highlighted chunk
+                    </p>
+                    <p class="keyhelp">
+                        <kbd>0</kbd> &nbsp; (zero) top of page
+                    </p>
+                    <p class="keyhelp">
+                        <kbd>1</kbd> &nbsp; (one) first highlighted chunk
+                    </p>
+                </div>
+            </div>
+        </div>
 
         <h2>
             <span class="text">{{nums.n_statements}} statements &nbsp;</span>
-            <button type="button" class="{{category.run}} shortkey_r button_toggle_run" title="Toggle lines run">{{nums.n_executed}}<span class="text"> run</span></button>
-            <button type="button" class="{{category.mis}} shortkey_m button_toggle_mis" title="Toggle lines missing">{{nums.n_missing}}<span class="text"> missing</span></button>
-            <button type="button" class="{{category.exc}} shortkey_x button_toggle_exc" title="Toggle lines excluded">{{nums.n_excluded}}<span class="text"> excluded</span></button>
+            <button type="button" class="{{category.run}} button_toggle_run" value="run" data-shortcut="r" title="Toggle lines run">{{nums.n_executed}}<span class="text"> run</span></button>
+            <button type="button" class="{{category.mis}} button_toggle_mis" value="mis" data-shortcut="m" title="Toggle lines missing">{{nums.n_missing}}<span class="text"> missing</span></button>
+            <button type="button" class="{{category.exc}} button_toggle_exc" value="exc" data-shortcut="x" title="Toggle lines excluded">{{nums.n_excluded}}<span class="text"> excluded</span></button>
             {% if has_arcs %}
-            <button type="button" class="{{category.par}} shortkey_p button_toggle_par" title="Toggle lines partially run">{{nums.n_partial_branches}}<span class="text"> partial</span></button>
+            <button type="button" class="{{category.par}} button_toggle_par" value="par" data-shortcut="p" title="Toggle lines partially run">{{nums.n_partial_branches}}<span class="text"> partial</span></button>
             {% endif %}
         </h2>
-    </div>
-</header>
 
-<aside class="help_panel">
-    <img id="panel_icon" src="keybd_open.png" alt="Hide keyboard shortcuts" />
-    <p class="legend">Hot-keys on this page</p>
-    <div>
-    <p class="keyhelp">
-        <span class="key">r</span>
-        <span class="key">m</span>
-        <span class="key">x</span>
-        <span class="key">p</span> &nbsp; toggle line displays
-    </p>
-    <p class="keyhelp">
-        <span class="key">j</span>
-        <span class="key">k</span> &nbsp; next/prev highlighted chunk
-    </p>
-    <p class="keyhelp">
-        <span class="key">0</span> &nbsp; (zero) top of page
-    </p>
-    <p class="keyhelp">
-        <span class="key">1</span> &nbsp; (one) first highlighted chunk
-    </p>
+        <div style="display: none;">
+            <button type="button" class="button_next_chunk" data-shortcut="j">Next highlighted chunk</button>
+            <button type="button" class="button_prev_chunk" data-shortcut="k">Previous highlighted chunk</button>
+            <button type="button" class="button_top_of_page" data-shortcut="0">Goto top of page</button>
+            <button type="button" class="button_first_chunk" data-shortcut="1">Goto first highlighted chunk</button>
+        </div>
     </div>
-</aside>
+</header>
 
 <main id="source">
     {% for line in lines -%}
diff --git a/coverage/htmlfiles/style.css b/coverage/htmlfiles/style.css
index 793f0bd27..2cabc74c9 100644
--- a/coverage/htmlfiles/style.css
+++ b/coverage/htmlfiles/style.css
@@ -114,25 +114,29 @@ header button.par.show_par { background: #ffa; border: 2px solid #bbbb00; margin
 
 @media (prefers-color-scheme: dark) { header button.par.show_par { background: #650; } }
 
-.help_panel, #source p .annotate.long { display: none; position: absolute; z-index: 999; background: #ffffcc; border: 1px solid #888; border-radius: .2em; color: #333; padding: .25em .5em; }
+#help_panel, #source p .annotate.long { display: none; position: absolute; z-index: 999; background: #ffffcc; border: 1px solid #888; border-radius: .2em; color: #333; padding: .25em .5em; }
 
 #source p .annotate.long { white-space: normal; float: right; top: 1.75em; right: 1em; height: auto; }
 
-#keyboard_icon { float: right; margin: 5px; cursor: pointer; }
+#help_panel_wrapper { float: right; position: relative; }
 
-.help_panel { padding: .75em; border: 1px solid #883; }
+#keyboard_icon { margin: 5px; }
 
-.help_panel .legend { font-style: italic; margin-bottom: 1em; }
+#help_panel_state { display: none; }
 
-.indexfile .help_panel { width: 25em; }
+#help_panel { top: 25px; right: 0; padding: .75em; border: 1px solid #883; }
 
-.pyfile .help_panel { width: 18em; }
+#help_panel .legend { font-style: italic; margin-bottom: 1em; }
 
-#panel_icon { float: right; cursor: pointer; }
+.indexfile #help_panel { width: 25em; }
+
+.pyfile #help_panel { width: 18em; }
+
+#help_panel_state:checked ~ #help_panel { display: block; }
 
 .keyhelp { margin-top: .75em; }
 
-.keyhelp .key { border: 1px solid black; border-color: #888 #333 #333 #888; padding: .1em .35em; font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-weight: bold; background: #eee; }
+kbd { border: 1px solid black; border-color: #888 #333 #333 #888; padding: .1em .35em; font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-weight: bold; background: #eee; border-radius: 3px; }
 
 #source { padding: 1em 0 1em 3.5rem; font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; }
 
@@ -274,13 +278,13 @@ header button.par.show_par { background: #ffa; border: 2px solid #bbbb00; margin
 
 @media (prefers-color-scheme: dark) { #index th:hover { background: #333; } }
 
-#index th.headerSortDown, #index th.headerSortUp { white-space: nowrap; background: #eee; }
+#index th[aria-sort="ascending"], #index th[aria-sort="descending"] { white-space: nowrap; background: #eee; padding-left: .5em; }
 
-@media (prefers-color-scheme: dark) { #index th.headerSortDown, #index th.headerSortUp { background: #333; } }
+@media (prefers-color-scheme: dark) { #index th[aria-sort="ascending"], #index th[aria-sort="descending"] { background: #333; } }
 
-#index th.headerSortDown:after { content: " ↑"; }
+#index th[aria-sort="ascending"]::after { content: "↑"; }
 
-#index th.headerSortUp:after { content: " ↓"; }
+#index th[aria-sort="descending"]::after { content: "↓"; }
 
 #index td.name a { text-decoration: none; color: inherit; }
 
diff --git a/coverage/htmlfiles/style.scss b/coverage/htmlfiles/style.scss
index 95511e706..775cdcb6c 100644
--- a/coverage/htmlfiles/style.scss
+++ b/coverage/htmlfiles/style.scss
@@ -331,14 +331,23 @@ header button {
 }
 
 // Help panel
-#keyboard_icon {
+#help_panel_wrapper {
     float: right;
+    position: relative;
+}
+
+#keyboard_icon {
     margin: 5px;
-    cursor: pointer;
 }
 
-.help_panel {
+#help_panel_state {
+    display: none;
+}
+
+#help_panel {
     @extend %popup;
+    top: 25px;
+    right: 0;
     padding: .75em;
     border: 1px solid #883;
 
@@ -356,24 +365,24 @@ header button {
         width: 18em;
         //min-height: 8em;
     }
-}
 
-#panel_icon {
-    float: right;
-    cursor: pointer;
+    #help_panel_state:checked ~ & {
+        display: block;
+    }
 }
 
 .keyhelp {
     margin-top: .75em;
+}
 
-    .key {
-        border: 1px solid black;
-        border-color: #888 #333 #333 #888;
-        padding: .1em .35em;
-        font-family: $font-code;
-        font-weight: bold;
-        background: #eee;
-    }
+kbd {
+    border: 1px solid black;
+    border-color: #888 #333 #333 #888;
+    padding: .1em .35em;
+    font-family: $font-code;
+    font-weight: bold;
+    background: #eee;
+    border-radius: 3px;
 }
 
 // Source file styles
@@ -643,16 +652,17 @@ $border-indicator-width: .2em;
             background: $light-gray2;
             @include background-dark($dark-gray2);
         }
-        &.headerSortDown, &.headerSortUp {
+        &[aria-sort="ascending"], &[aria-sort="descending"] {
             white-space: nowrap;
             background: $light-gray2;
             @include background-dark($dark-gray2);
+            padding-left: .5em;
         }
-        &.headerSortDown:after {
-            content: " ↑";
+        &[aria-sort="ascending"]::after {
+            content: "↑";
         }
-        &.headerSortUp:after {
-            content: " ↓";
+        &[aria-sort="descending"]::after {
+            content: "↓";
         }
     }
     td.name a {
diff --git a/tests/gold/html/styled/style.css b/tests/gold/html/styled/style.css
index 793f0bd27..9cbe5fadf 100644
--- a/tests/gold/html/styled/style.css
+++ b/tests/gold/html/styled/style.css
@@ -114,25 +114,29 @@ header button.par.show_par { background: #ffa; border: 2px solid #bbbb00; margin
 
 @media (prefers-color-scheme: dark) { header button.par.show_par { background: #650; } }
 
-.help_panel, #source p .annotate.long { display: none; position: absolute; z-index: 999; background: #ffffcc; border: 1px solid #888; border-radius: .2em; color: #333; padding: .25em .5em; }
+#help_panel, #source p .annotate.long { display: none; position: absolute; z-index: 999; background: #ffffcc; border: 1px solid #888; border-radius: .2em; color: #333; padding: .25em .5em; }
 
 #source p .annotate.long { white-space: normal; float: right; top: 1.75em; right: 1em; height: auto; }
 
-#keyboard_icon { float: right; margin: 5px; cursor: pointer; }
+#help_panel_wrapper { float: right; position: relative; }
 
-.help_panel { padding: .75em; border: 1px solid #883; }
+#keyboard_icon { margin: 5px; }
 
-.help_panel .legend { font-style: italic; margin-bottom: 1em; }
+#help_panel_state { display: none; }
 
-.indexfile .help_panel { width: 25em; }
+#help_panel { top: 25px; right: 0; padding: .75em; border: 1px solid #883; }
 
-.pyfile .help_panel { width: 18em; }
+#help_panel .legend { font-style: italic; margin-bottom: 1em; }
 
-#panel_icon { float: right; cursor: pointer; }
+.indexfile #help_panel { width: 25em; }
+
+.pyfile #help_panel { width: 18em; }
+
+#help_panel_state:checked ~ #help_panel { display: block; }
 
 .keyhelp { margin-top: .75em; }
 
-.keyhelp .key { border: 1px solid black; border-color: #888 #333 #333 #888; padding: .1em .35em; font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-weight: bold; background: #eee; }
+kbd { border: 1px solid black; border-color: #888 #333 #333 #888; padding: .1em .35em; font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-weight: bold; background: #eee; border-radius: 3px; }
 
 #source { padding: 1em 0 1em 3.5rem; font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; }