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How effective is user agent redefinition for Chrome developers when emulating other browsers?

The Chrome developer tools have a feature for changing the user agent for server spoofing, which allows developers to test applications for other devices and browsers, without leaving the convenience of the Chrome browser on the desktop terminal. I assume that Chrome imitates these other browsers, and not them practically. How compatible are Chrome standards for JavaScript, CSS, and other browser technical differences? For example, did someone do a comprehensive test to determine if Chrome emulation Internet Explorer 7 and the actual Internet Explorer 7 display the same page, pixel for pixel?

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Chrome does not attempt to emulate other browsers at all when changing the user agent string.
To test this statement, simply use special Internet Explorer features such as conditional compilation, conditional comments, ActiveX, VB Script, ... None of these features in Chrome.

If you want Chrome to display pages such as Internet Explorer, install the IE Tab Chrome extension. However, an existing installation of Internet Explorer is required, which means that operating systems other than Windows, such as Linux and Mac, are not supported.

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