> If document is declared as strict or transitional it must validate
> against corresponding DTD's in order to be valid. When there's no
> declaration, there's nothing to validate against. If quirks mode is
> triggered by lack of doctype declaration, then validity does not even
> apply, since there's no declaration to validate against. Am I missing
> something?

But if I decleared strict or transitional and then add a custom
attribute to an element - the browser swithes to quirck mode or Iam

> > > It is indeed useful. HTML5 even introduced custom data-* attributes
> > > [1]
> > When will it the standard?
> 2022

Huh? we have enough time to fell free )))))
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