This avoids looking at every single installed typeface to see if there's
a family name match.
Fixes a large performance regression introduced when making
StyleComputer consider system fonts in CSS font fallback.
Regressed with 69a81243f5.
As it turns out, there are popular User-Agent blacklists out there with
the string "LibWeb" in them. Such entries have been added long before
our LibWeb existed, so "LibWeb" has presumably been used by some bot
that people got tired of.
Trying to chase down everyone who has installed these blacklists is
obviously a losing battle, so this patch simply removes the engine part
of our default UA string.
We were relying on the table fixup algorithm to insert the missing table
row, which fails to do so when we only have an image in the button.
While that might be a problem with the table fixup algorithm, we should
build a correct layout tree explicitly anyway.
Fixes crashes on GitHub.
With this change, elements that want to receive viewport rect updates
will need to register on document instead of the browsing context.
This change solves the problem where a browsing context for a document
is guaranteed to exist only while the document is active so browsing
context might not exit by the time DOM node that want to register is
constructed.
This is a part of preparation work before switching to navigables where
this issue becomes more visible.
Fixes stack-use-after-return bug found by ASAN that happens when
`response` reference captured by `process_response` is modified
after navigation has been canceled.
Fixes bug when "clip" property does not affect abspos children.
This change makes "clip" property to be applied together with
"overflow: hidden" in `apply_clip_overflow_rect()` that already
handles abspos children correctly.
Instead of calling to_lowercase() on two strings for every step while
iterating over the HTMLCollection returned by getElementsByTagName(),
we now cache the lowercased tag name beforehand and reuse it.
2.4x speed-up on WebKit/PerformanceTests/DOM/DOMDivWalk.html
User styles are applied after the UserAgent's built-in styles, and
before the Author styles that are part of the web page.
Because they're neither part of the page, but can still be modified
while the page is open, caching is a little tricky. The approach here
is to piggy-back on the StyleComputer's rule caches, which already get
rebuilt whenever the styles change. This is not the smartest approach,
since it means re-parsing the style sheet more often than is necessary,
but it's simple and works. :^)
This matches if the element has a placeholder, and that placeholder is
currently visible. This applies to `<input>` and `<textarea>` elements,
but our `<textarea>` is very limited so does not support placeholders.
As noted in a9620d8784 we don't currently
set the target element so this does not function, so no tests. But it
should work once we have a fleshed out Navigables implementation. :^)
Grid specification https://www.w3.org/TR/css-grid-2/#z-order defines
special painting order for grid items which should be the same as for
defined for inline-blocks in CSS2.
Check the width of the next token after white space to decide line
breaks. The next width can also be the total width of multiple tokens.
This better follows the CSS Text specification and matches behavior of
other browsers.
Fixes#20388.
We still don't know how to resolve font-relative lengths in <img sizes>
since we don't always have font size information available at this stage
in the pipeline, but we can at least handle viewport-relative lengths.
This fixes an issue on many websites where low-resolution images were
loaded (appropriate for a small viewport) even when the viewport is big.
