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Usage of emoji in HTML

You can paste the chosen Emoji

Another option is to use the codepoint of the Emoji and replacing (U+) with (&#x).

Usage of emoji in CSS

You need to use the ::before or ::after pseudo-element coupled with the content property where you paste the Emoji as the value.

Another option is to use codepoint replacing (U+) with (\0).

Usage of emoji in JavaScript

Paste the Emoji in the innerHTML value

Or use the String method fromCodePoint mixed with the codepoint value where you replace (U+) with (0x).