HTML : Apply a CSS hue rotate filter to a greyscale image

HTML : Apply a CSS hue rotate filter to a greyscale image
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As promised, I have a hidden feature that I want to share with 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.

A brief presentation of myself,
Hi there, I go by the name of Delphi.
I help you answer your questions.
HTML : Apply a CSS hue rotate filter to a greyscale image
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to a Apply filter greyscale CSS a HTML image rotate : hue