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by err4nt
2028 days ago
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Custom attributes (without data-*) are invalid HTML unless you're using them on a custom HTML element. If you're defining a custom element, you're responsible for defining what its attributes mean - outside of that, no they aren't allowed and yes they are unsafe to use, and restrict the standards bodies from being able to move forward freely without risking breaking the web because of invalid code in the wild. |
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