Troubleshooting
With the rising popularity of web development tools for browsers, your browser is the best tool for troubleshooting styling issues on a page. Mozilla Firefox initially had the most advanced inspection tools using a free third-party add-on called Firebug. Later, Chrome released its own development tools, while Firefox and Internet Explorer eventually built and improved their own. All modern desktop browsers now provide advanced JavaScript and CSS information for desktop and mobile devices.
Most browser developer tools can be opened using the same keyboard shortcuts. Internet Explorer responds to the F12 key as far back as version 8. Chrome and Firefox also respond to F12, with the keyboard combination of Ctrl + Shift + I (Cmd + ...
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