Re: [dom] DOMTokenList#toggle: don't treat everything non-undefined as true (#64)

I guess we can close the issue since the spec is OK and non-Firefox browsers should update their behavior? Or do we want to first check if this is mobile-web-compatible or something?

(BTW, after today I can recognize each of Chrome, Firefox, Safari, Edge & IE 11 just by checking results of various classList/className-related tests...)

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