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http://html5.org/tools/web-apps-tracker?from=8239&to=8240#diff [[ + <p>If the resource is <span data-x="the link is an alternative stylesheet">an alternative + stylesheet</span> then the user agent may defer obtaining the resource until it is part of the + <span>preferred style sheet set</span>. <a href="#refsCSSOM">[CSSOM]</a></p> <!-- what about DOM + access of alt style sheets? --> ]] I think this part is wrong, alternate stylesheets can't be deferred. (CSSOM is also wrong on that part, currently.)
Yeah, hence the comment. (This is old text I haven't looked at in a while.) So we're sure that we can't defer alt style sheets for Web compat?
Deferring would make the API basically not work, and it seems people are more interested in keeping the API working than exposing alternate stylesheets in the UI. The Web compat situation isn't super clear but there was basically no interest in killing alternative stylesheets.
Roger. I've removed that paragraph for now.
Checked in as WHATWG revision r8244. Check-in comment: Browsers can't delay alt style sheets and remain Web compatible, apparently. http://html5.org/tools/web-apps-tracker?from=8243&to=8244