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From the slug of this page it seems since 2011? https://www.w3.org/TR/2011/WD-html5-20110525/syntax.html#opt...

Note though that there are some conditions.




It's been allowed since long before then, all the way back to the og html 4.01 spec in 1999


All the way back to HTML 2.0, which was the first non-draft HTML spec.


I see. Today I learnt something new!




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