In addition, Firefox indicates which DOM nodes have handlers attached with an event icon. node removal to monitor when the element is removed from the DOM.Ī breakpoint is automatically activated in the Sources panel when such an event occurs.įirefox DevTools offer an identical feature in the Inspector pane.attribute modifications to monitor when the element’s attributes, such as class, are changed, or. ![]() subtree modifications to monitor when the element or any child element is changed.To locate a process, right-click any HTML element in the Elements panel and select one of the options from the Break on sub-menu: It can be difficult to determine which function is responsible for updating a specific HTML DOM element when an event occurs. ![]() This is a great tool to understand how much of an external depednencies are you using in your code, if you’re importing a 100kb library and only using 1% of it, you’ll clearly see it here too. However, be wary that coverage information is reset when you reload or navigate to a new page. If you are testing a Single Page App, you can navigate around and use features to update the unused code indicators. Reload the page and the panel will show the percentage of unused code with a bar chart:Ĭlick any JavaScript file and unused code is highlighted with a red bar in the line number gutter. To start, open Coverage from the More tools sub-menu in the DevTools menu. Find unused JavaScriptĬhrome’s Coverage panel allows you to quickly locate JavaScript (and CSS) code that has - and has not - been used. From any DevTools panel, press Ctrl | Cmd Shift P then search for an option by name:ĭelete the > prompt to search for a loaded file by its name.
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