[whatwg] Link.onload

[Boris Zbarsky]

Jonas Sicking wrote:
> This sounds like a good idea to me. Seems useful for dynamically added
> stylesheets too, and possibly for stylesheets where the href attribute
> is dynamically changed.
> 
> Same thing goes for the <style> element since an inline stylesheet can
> have @import rules.

Indeed, and there are some things that need specifying around this.  See 
https://bugzilla.mozilla.org/show_bug.cgi?id=185236#c12 and 
https://bugzilla.mozilla.org/show_bug.cgi?id=185236#c15 for example.

Note that image onload events do fire asynchronously in Gecko even if 
the data is synchronously available, so I have no problem with defining 
that all the load events, including for inline <style> with no imports, 
fire async.

Note that inline scripts do not fire load events, by the way.  Inline 
sheets with @import really should, though, no matter what happens for 
inline sheets without @import.

-Boris