Re: [whatwg/dom] Web reality: DOMTokenList's toggle() cannot always update the corresponding attribute (#451)

But the8472 solution would not be better? For  [update steps](https://dom.spec.whatwg.org/#concept-dtl-update) we can check if [ordered set parser](https://dom.spec.whatwg.org/#concept-ordered-set-parser) is the same ass attr.value, and if yes then return, if no then set attr.value. This will cover all other methods that which unnecessarily set the attribute again (and potentially invoke an observer).


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