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

But for this, Firefox outputs 1, which means that `replace("a", "a")` does run the update steps if "a" is in the token list, even though it's a no-op: https://jsfiddle.net/4d8ja9yw/2/  What does WebKit do?  (I'm still trying to compile WebKit myself, but I can't find non-ancient binaries for Linux, so until I succeed I can't test it.)

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