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Debugging and Troubleshooting Your Webpage

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F12 developer tools is built into every installation of Windows Internet Explorer 9. This on-demand tool is available anytime, on any page, and enables website developers to quickly debug JavaScript, HTML, and Cascading Style Sheets (CSS), as well track down performance problems on a webpage or network.

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How to use F12 Developer Tools to Debug your Webpages

The F12 tools is a suite of on-demand tools that is built into every installation of Internet Explorer 9. F12 tools is available anytime, on any page, and enables website developers to quickly debug JavaScript, HTML, and CSS, as well track down performance problems on a webpage or network.