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

https://jsfiddle.net/4d8ja9yw/1/

Firefox outputs 1, like the old spec, not normalizing on a no-op.  Edge and Chrome don't appear to support replace() at all.  I wasn't able to test in WebKit right now (have to recompile it).

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