To debug the page, open it in Internet Explorer 11. Pressing F12 or Ctrl+Shift+I opens a blank instance of the Microsoft Edge DevTools and displays the following message: Developer Tools aren't available in Internet Explorer mode. Right-clicking and then selecting View Source launches Notepad. Inspect Element isn't visible on the right-click menu. Some DevTools panels don't work, such as Network and Performance, because the rendering engine switches from Chromium to Internet Explorer 11. If a tab uses IE mode, the tab has the following limitations: To view the document mode of a website in IE mode, select the IE mode indicator icon in the address bar. The IE mode indicator icon appears in the address bar if the Enterprise admin has configured the website to appear in IE mode. IE mode is available on Windows 10 Version 1903 (May 2019 Update), and is coming to all supported Windows platforms. When a tab renders in IE mode, the IE mode indicator icon appears in the address bar for the specific tab. The rendering process is constrained to the lifetime of the tab for a specific site (or app). The Microsoft Edge process manager handles the lifetime of the rendering process. In IE mode, the rendering process is based on Internet Explorer 11. Support for the following technologies is included in IE mode: IE mode allows enterprises to manage compatibility with technologies that are currently not compatible with any modern web browsers. When you navigate to these websites in Microsoft Edge, an instance of Internet Explorer 11 runs and renders the site in a tab. IE mode allows enterprises to specify a list of websites that only work in Internet Explorer 11. Internet Explorer mode (IE mode) integrates with Microsoft Edge DevTools.

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