Some elements, like HTMLMediaElement, must have a unique task sources
for every instance of that element that is created. Support this with a
simple wrapper around IDAllocator.
Grid and flex containers have their own rules for abspos items, so we
shouldn't try to be clever and put them in the "current" anonymous
wrapper block. That behavior is primarily for the benefit of block &
inline layout.
When calculating the intrinsic width of a block-level box, we now ignore
the preferred width entirely, and not just when the preferred width
should be treated as auto.
The condition for this was both confused and wrong, as it looked at the
available width around the box, but didn't check for a width constraint
on the box itself.
Just because the available width has an intrinsic sizing constraint
doesn't mean that the box is undergoing intrinsic sizing. It could also
be the box's containing block!
If we fail to set the response type to an error, calling code will think
the fetch was successful. We also should not default to an error code of
200, which would also indicate success.
This fixes multi-layer backgrounds with background positions. This
is a little awkard, so maybe it would be better to refactor the
parsing code to make these lists directly, but right now this is
the simplest fix.
Rather than the very C-like API we currently have, accepting a void* and
a length, let's take a Bytes object instead. In almost all existing
cases, the compiler figures out the length.
This parses the new background-position-x/y longhands and properly
hooks up them up. This requires converting PositionStyleValue to
just contain two EdgeStyleValues so that it can be easily expanded
into the longhands.
This is something we're supposed to do according to the HTML spec.
Note that image loading is currently completely ad-hoc, and this just
adds a simple DocumentLoadEventDelayer to the existing implementation.
This will allow us to use images in layout tests, which rely on the
document load event firing at a predictable time.
This now uses the current font (rather than the painter's default)
and scales it correctly. This is not perfect though as just naviely
doing .draw_text() here does not follow the proper text layout logic
so this is misaligned (by a pixel or two) with the text in the <li>.
At the end of HTML::EventLoop::process(), the loop reschedules itself if
there are more runnable tasks available.
However, the condition was flawed: we would reschedule if there were any
microtasks queued, but those tasks will not be processed if we're
currently within the scope of a microtask checkpoint.
To fix this, we now only reschedule the HTML event loop for microtask
processing *if* we're not already in a microtask checkpoint.
This fixes the 100% CPU churn seen when looking at PRs on GitHub. :^)
