How does the :not selector work to block older browsers and for which browsers does it work? [closed]

Tags: css,css3

Problem :

How does the


selector works to block older browsers and for which browsers does it work in the following tutorial?

Solution :

The CSS selector does not block browser, it's just not supported by the browser, i.e. when CSS file is being parsed by browser's built-in parser (which in turn supports certain CSS specification), unknown selectors and rules will be ignored and won't be added into styles of frames in render tree

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