Re: [whatwg/dom] Standardize certain Microsoft event extensions (#334)

do we know how often assigning the return value from true to false occurs?

I'd prefer if the implementation was essentially pollyfill-able;

For example:
bool legacyReturnValue() const { return !defaultPrevented(); }
void setLegacyReturnValue(bool returnValue) { if (returnValue) preventDefault(); }

Which specifically disallows the true->false transition. (much like the setCancelBubble debate)


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