As a side-note, it may be interesting to warn also that synchronous XHR has different semantics between browsers so is not a good choice anyway.
Cheers, David On 2/7/14 6:18 PM, Jonas Sicking wrote: > Agreed. I think for this to be effective we need to get multiple browser > vendors being willing to add such a warning. We would also need to add > text to the various versions of the spec (whatwg and w3c). > > Which browsers are game? (I think mozilla is). Which spec editors are? > > / Jonas > -- David Rajchenbach-Teller, PhD Performance Team, Mozilla