CSS : How to disable text selection highlighting

CSS : How to disable text selection highlighting
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On Google, Search for "hows tech developer connect"

Here's a secret feature that I promised to disclose to you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
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It will change your youtube progress bar into a flashing rainbow.

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I can assist you in answering your queries.
CSS : How to disable text selection highlighting
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highlighting How selection text to : disable CSS