Browser developer tools

Modern web browsers include more than just the ability to display the contents of a webpage. Many browsers include tools that you can use to evaluate a website’s HTML, do performance tests, or even modify the contents of a page to view changes in context.

In most cases, you can display a browser’s developer tools by pressing F12 in Windows or Command-Option-I in macOS, or by right-clicking the item that you want to examine and then clicking Inspect Element.

Available browser developer tools

The following browsers either include developer tools for your use or have separate plugins that integrate with the browser for that purpose:

Browser Tool Availability Info
Google Chrome DevTools Integrated product link
Mozilla Firefox Developer Tools Integrated product link
Mozilla Firefox Firebug Plugin product link
Microsoft Edge F12 devtools Integrated product link
Microsoft Internet Explorer Developer Toolbar Integrated product link
Apple Safari Developer Tools Integrated product link

Note for Apple Safari users

To enable the integrated developer options in Safari, go to Safari > Preferences, and in the Advanced tab, select the Show Develop menu in the menu bar check box.

The integrated developer features are now displayed in the Develop menu.

Developer tools for iOS browsers

If you are developing for an iPhone or iPad, you can use a Safari browser on macOS to view webpages as presented on iOS devices. For information about this process, see Viewing the Source Code on iPhone and iPads using Safari Webkit Development Tools.

Other useful tools

There are many useful tools that are available beyond the general inspection tools offered by most browsers. For example, here are several tools for two of the most popular, current browsers:

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