diff --git a/files/en-us/learn/server-side/express_nodejs/mongoose/index.md b/files/en-us/learn/server-side/express_nodejs/mongoose/index.md
index aa393e6bdb7fdd5..024ad2050ed610c 100644
--- a/files/en-us/learn/server-side/express_nodejs/mongoose/index.md
+++ b/files/en-us/learn/server-side/express_nodejs/mongoose/index.md
@@ -402,7 +402,7 @@ You can search for records using query methods, specifying the query conditions
 ```js
 const Athlete = mongoose.model("Athlete", yourSchema);
 
-// find all athletes who play tennis, selecting the 'name' and 'age' fields
+// find all athletes who play tennis, returning the 'name' and 'age' fields
 const tennisPlayers = await Athlete.find(
   { sport: "Tennis" },
   "name age",
diff --git a/files/en-us/mozilla/add-ons/webextensions/api/action/index.md b/files/en-us/mozilla/add-ons/webextensions/api/action/index.md
index bfb64fd15e1f1e8..60671ce41bc7696 100644
--- a/files/en-us/mozilla/add-ons/webextensions/api/action/index.md
+++ b/files/en-us/mozilla/add-ons/webextensions/api/action/index.md
@@ -9,7 +9,7 @@ browser-compat: webextensions.api.action
 
 Adds a button to the browser's toolbar.
 
-> **Note:** This API is available in Manifest V3 or higher.
+> **Note:** This API is available in Manifest V3 or higher. It replaces the Manifest V2 APIs {{WebExtAPIRef("browserAction")}} and, in Chrome and Safari, {{WebExtAPIRef("pageAction")}}.
 
 A [browser action](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Toolbar_button) is a button in the browser's toolbar.
 
@@ -19,7 +19,7 @@ If you specify a popup, it is shown — and the content loaded — when the user
 
 The button also has a context menu, and you can add items to this menu with the {{WebExtAPIRef("menus")}} API using the `action` {{WebExtAPIRef("menus.ContextType")}}.
 
-You can define most of a browser action's properties declaratively using the [`browser_action`](/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_action) key in the manifest.json.
+You can define most of a browser action's properties declaratively using the [`action`](/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/action) key in the manifest.json.
 
 With the `action` API, you can:
 
@@ -79,7 +79,7 @@ With the `action` API, you can:
 
 {{Compat}}
 
-> **Note:** This API is based on Chromium's [`chrome.action`](https://developer.chrome.com/docs/extensions/reference/action/) API. This documentation is derived from [`browser_action.json`](https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/browser_action.json) in the Chromium code.
+> **Note:** This API is based on Chromium's [`chrome.action`](https://developer.chrome.com/docs/extensions/reference/action/) API. This documentation is derived from [`action.json`](https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/action.json) in the Chromium code.
 
 <!--
 // Copyright 2015 The Chromium Authors. All rights reserved.
diff --git a/files/en-us/web/accessibility/keyboard-navigable_javascript_widgets/index.md b/files/en-us/web/accessibility/keyboard-navigable_javascript_widgets/index.md
index 0e6cf399abea13b..51df8f220b0b233 100644
--- a/files/en-us/web/accessibility/keyboard-navigable_javascript_widgets/index.md
+++ b/files/en-us/web/accessibility/keyboard-navigable_javascript_widgets/index.md
@@ -126,7 +126,7 @@ Here's an example of a [WAI-ARIA tree view](https://files.paciellogroup.com/trai
 
 Do not use `createEvent()`, `initEvent()` and `dispatchEvent()` to send focus to an element. DOM focus events are considered informational only: generated by the system after something is focused, but not actually used to set focus. Use `element.focus()` instead.
 
-#### Use onfocus to track the current focus</h6>
+#### Use onfocus to track the current focus
 
 Don't assume that all focus changes will come via key and mouse events: assistive technologies such as screen readers can set the focus to any focusable element. Track focus using `onfocus` and `onblur` instead.
 
diff --git a/files/en-us/web/api/canvas_api/tutorial/basic_animations/index.md b/files/en-us/web/api/canvas_api/tutorial/basic_animations/index.md
index 6ac46f99519ca9d..d25ece17b7c11c3 100644
--- a/files/en-us/web/api/canvas_api/tutorial/basic_animations/index.md
+++ b/files/en-us/web/api/canvas_api/tutorial/basic_animations/index.md
@@ -169,6 +169,8 @@ function clock() {
   ctx.restore();
 
   const sec = now.getSeconds();
+  // To display a clock with a sweeping second hand, use:
+  // const sec = now.getSeconds() + now.getMilliseconds() / 1000;
   const min = now.getMinutes();
   const hr = now.getHours() % 12;
 
@@ -236,6 +238,9 @@ window.requestAnimationFrame(clock);
 
 ### Result
 
+> **Note:** Although the clock updates only once every second, the animated image is updated at 60 frames per second (or at the display refresh rate of your web browser).
+> To display the clock with a sweeping second hand, replace the definition of `const sec` above with the version that has been commented out.
+
 {{EmbedLiveSample("An_animated_clock", "180", "200")}}
 
 ## A looping panorama
diff --git a/files/en-us/web/css/_colon_visited/index.md b/files/en-us/web/css/_colon_visited/index.md
index cebcaf17fb49103..25229ee465a2764 100644
--- a/files/en-us/web/css/_colon_visited/index.md
+++ b/files/en-us/web/css/_colon_visited/index.md
@@ -7,7 +7,7 @@ browser-compat: css.selectors.visited
 
 {{CSSRef}}
 
-The **`:visited`** [CSS](/en-US/docs/Web/CSS) [pseudo-class](/en-US/docs/Web/CSS/Pseudo-classes) applies once the link has been visited by the user. For privacy reasons, the styles that can be modified using this selector are very limited. The `:visited` pseudo-class applies only {{htmlelement("a")}} and {{htmlelement("area")}} elements that have an `href` attribute.
+The **`:visited`** [CSS](/en-US/docs/Web/CSS) [pseudo-class](/en-US/docs/Web/CSS/Pseudo-classes) applies once the link has been visited by the user. For privacy reasons, the styles that can be modified using this selector are very limited. The `:visited` pseudo-class applies only to {{htmlelement("a")}} and {{htmlelement("area")}} elements that have an `href` attribute.
 
 {{EmbedInteractiveExample("pages/tabbed/pseudo-class-visited.html", "tabbed-shorter")}}
 
diff --git a/files/en-us/web/css/_doublecolon_first-letter/index.md b/files/en-us/web/css/_doublecolon_first-letter/index.md
index 7fe87575dca1288..0c4763cd9311500 100644
--- a/files/en-us/web/css/_doublecolon_first-letter/index.md
+++ b/files/en-us/web/css/_doublecolon_first-letter/index.md
@@ -7,7 +7,7 @@ browser-compat: css.selectors.first-letter
 
 {{CSSRef}}
 
-The **`::first-letter`** [CSS](/en-US/docs/Web/CSS) [pseudo-element](/en-US/docs/Web/CSS/Pseudo-elements) applies styles to the first letter of the first line of a [block-level element](/en-US/docs/Web/CSS/Visual_formatting_model#block-level_elements_and_block_boxes), but only when not preceded by other content (such as images or inline tables).
+The **`::first-letter`** [CSS](/en-US/docs/Web/CSS) [pseudo-element](/en-US/docs/Web/CSS/Pseudo-elements) applies styles to the first letter of the first line of a [block container](/en-US/docs/Web/CSS/Visual_formatting_model#block_containers), but only when not preceded by other content (such as images or inline tables).
 
 {{EmbedInteractiveExample("pages/tabbed/pseudo-element-first-letter.html", "tabbed-shorter")}}
 
diff --git a/files/en-us/web/css/_doublecolon_first-line/index.md b/files/en-us/web/css/_doublecolon_first-line/index.md
index d43218722aa5f53..df0edc887f10322 100644
--- a/files/en-us/web/css/_doublecolon_first-line/index.md
+++ b/files/en-us/web/css/_doublecolon_first-line/index.md
@@ -7,7 +7,7 @@ browser-compat: css.selectors.first-line
 
 {{CSSRef}}
 
-The **`::first-line`** [CSS](/en-US/docs/Web/CSS) [pseudo-element](/en-US/docs/Web/CSS/Pseudo-elements) applies styles to the first line of a [block-level element](/en-US/docs/Web/CSS/Visual_formatting_model#block-level_elements_and_block_boxes).
+The **`::first-line`** [CSS](/en-US/docs/Web/CSS) [pseudo-element](/en-US/docs/Web/CSS/Pseudo-elements) applies styles to the first line of a [block container](/en-US/docs/Web/CSS/Visual_formatting_model#block_containers).
 
 {{EmbedInteractiveExample("pages/tabbed/pseudo-element-first-line.html", "tabbed-shorter")}}