index.rst

Tips

General

Screenshots:

• Entire page: Click the screenshot button ( needs to be enabled <tools-toolbox-extra-tools> first).
• Viewport: Click the screenshot button () in Responsive Design Mode <responsive-design-mode-camera-button>.
• Node: Right-click a node within the Inspector and click "Screenshot Node" <taking-screenshots-of-an-element>.
• Via Web Console command <../web_console/helpers/index>: screenshot <filename.png> --fullpage.

Settings:

• Choose between a light and a dark theme <settings-themes> for the developer tools.
• Change the keyboard bindings <settings-editor-preferences> to Vim, Emacs or Sublime Text if you're used to different shortcuts.
• Check or uncheck the different tools to enable or disable them. (There are more than the default tools!)

Page Inspector

In the markup view <page_inspector_ui_tour_html_pane>:

• Press H with a node selected to hide/show it.
• Press Backspace or Del with a node selected to delete it.
• Alt + click on a node to expand or collapse it and all its descendants.
• Click on the last breadcrumb button <page-inspector-how-to-examine-and-edit-html-breadcrumbs> to scroll the selection into view in the inspector.
• Click the "ev" icon besides a node to see all event listeners attached to it <../page_inspector/examine_event_listeners/index>.
• Press S with a node selected to see it in the page (same as right-click a node and click Scroll Into View <page_inspector_how_to_examine_and_edit_scroll_into_view>).
• Right-click a node and click Use in Console<page_inspector_how_to_examine_and_edit_html_use_in_console> to command line <../web_console/the_command_line_interpreter/index> as tempN variable.

When selecting elements <page_inspector_select_element_button>:

• Shift + click to select an element but keep selecting (picker mode doesn't disengage).
• Use ←/→ to navigate to parents/children elements (if they're hard to select).

In the rules view <page_inspector_ui_tour_rules_view>:

• Click the inspector icon next to any selector to highlight all elements that match it.
• Click the inspector icon next to the element{} rule to lock the highlighter on the current element.
• Right-click any property and select "Show MDN Docs" to view the MDN docs for this property.
• Click on the filter icon next to an overridden property to find which other property overrides it <page-inspector-how-to-examine-and-edit-css-overridden-declarations>.
• Right-click on a name, value, or rule to copy anything from the name, the value, the declaration or the whole rule to your clipboard.

Web Console

In all panels:

• Esc opens the split console <../web_console/split_console/index>; useful when debugging, or inspecting nodes

In the command line <../web_console/the_command_line_interpreter/index>:

• $0 <web_console_helpers_$0> references the currently selected node.
• $() <web_console_helpers_$> is a shortcut to document.querySelector()
• $$() <web_console_helpers_$$> returns an array with the results from document.querySelector().
• copy <web_console_helpers_copy> copies anything as a string.
• Right-click a node in the Inspector and click Use in Console <page_inspector_how_to_examine_and_edit_html_use_in_console> to create a temp*N* <web_console_helpers_tempn> variable for it.
• console.table() displays tabular data as table.
• help <web_console_helpers_help> opens the MDN page describing the available commands.
• :screenshot <filename.png> --fullpage saves a screenshot to your downloads directory using the optional file name. If no filename is included, the file name will be in this format:

Screen Shot date at time.png

The --fullpage parameter is optional. If you include it, the screenshot will be of the whole page, not just the section visible in the browser windows. The file name will have -fullpage appended to it as well. See Web Console Helpers <../web_console/helpers/index> for all parameters.

In the console output:

• Click on the inspector icon next to an element in the output to select it within the Inspector <web_console_rich_output_highlighting_and_inspecting_dom_nodes>.
• Check "Enable persistent logs" <settings-common-preferences> in the settings to keep logged messages from before even after navigation.
• Check "Enable timestamps" <settings-web-console> in the settings to show timestamps besides the logged messages.

Debugger

• Skip JavaScript libraries in debugging sessions via the black box icon .
• Press Ctrl + Alt + F to search in all scripts.
• Press Ctrl + D to search for a function definition.
• Press Ctrl + L to go to a specific line.

Style Editor

• The black box icon in the style sheet pane toggles the visibility of a style sheet.
• Click an @media rule <style-editor-the-at-rules-sidebar> to apply it in Responsive Design Mode <../responsive_design_mode/index>.
• Click the import button to import a style sheet or the create button to create a new one.
• Click the options button in the style sheet pane <style-editor-the-style-sheet-pane> and click "Show original sources" <style-editor-source-map-support> to toggle the display of CSS preprocessor files.

Network Monitor

• Click the request summary to compare performance of cache vs. no-cache page loading <../network_monitor/performance_analysis/index>.
• When a request is selected click "Edit and Resend" <network-monitor-request-list-edit-and-resend> to modify its headers and send it again.
• Check "enable persistent logs" <settings-common-preferences> in the settings to keep requests from before even after navigation.
• Hover the "js" icon within the "Cause" column <request-list-requst-list-cause-column> to see the JavaScript stack trace, which caused the request.
• Check "Disable HTTP Cache (when toolbox is open)" <settings_advanced_settings> in the settings to disable the network cache while debugging network issues.

Storage Inspector

• Right-click the column headers to open a menu allowing to toggle the display of the columns.
• Right-click an entry and click "Delete name" to delete it or "Delete All" to delete all entries.
• Select an entry to see the parsed value of it in the sidebar.