Re: [dom] DOMSettableTokenList needs an associated content attribute (#81)

@bzbarsky: have another question, you wrote "HTMLTableCellElement.headers -- implemented as a string, not a DOMSettableTokenList" << but this string type is correct or not? I ask because test ping variant in Chrome and Firefox (HTMLAnchorElement, HTMLAnchorElement) and they both return string (not DOMSettableTokenList object), but you wrote that "So my take on it is that Chrome has correct implementations of this for various places (e.g. sandbox/ping)". Per IDL [PutForwards=value] should not only affect setting, not getting?

And Anne today make changes for DOMSettableTokenList:
"Setting the value attribute must set an attribute value for the associated element using associated attribute’s local name and the given value."
So this must only change asociated content attribute (without touching internal set, removing duplicate or unnecessary white space from setting string)?



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