On Tue, Apr 16, 2013 at 2:48 AM, Glenn Maynard <gl...@zewt.org> wrote: > The solution I propose is the same as it's always been. Have a synchronous > algorithm, eg. "parse and capture the URL", which is invoked at the time > (eg.) .src is set. This 1: invokes the URL spec's parser; 2: if the result > is a blob URL, grabs the associated blob data and puts a reference to it in > the resulting parsed URL; then 3: returns the result. Assigning .src would > then synchronously invoke this, so the blob is always captured immediately, > even if the fetch isn't. This way, we can synchronously resolve all this > stuff, even if the fetch won't happen for a while.
As Ian pointed out (see WHATWG IRC reference above) you don't always want to parse synchronously as the base URL might change at a later stage. This also does not work for CSS where when parsing happens is even less defined (which might benefit projects such as Servo). > This would also fix https://www.w3.org/Bugs/Public/show_bug.cgi?id=21058, > because URLs would be resolved against <base href> synchronously. That would make <img> behave differently from e.g. <a download>. Pretty sure <a> needs to resolve at the point it is actually clicked. -- http://annevankesteren.nl/
