Before this patch, we would build full computed style for these pseudo
elements, for every DOM element, even if no ::before/::after selector
actually matched.
This was a colossal waste of time, and we can also just not do that.
Instead, just abort pseudo element style resolution early if no relevant
selectors matched. :^)
The name "initial containing block" was wrong for this, as it doesn't
correspond to the HTML element, and that's specifically what it's
supposed to do! :^)
The shadowRoot property getter that will be added in subsequent commits
has an additional check that checks whether the shadow root is opened.
I didn't update the function logic to match with the IDL interface,
because it's very likely we don't want that check in the existing code,
so that for example closed shadow root elements can still be updated.
Introduce `TableWrapper` type so table wrappers could be
distinguished from block containers and override width
calculation for table wrappers (CSS 2.2 spec, section 17.5.2)
inside BFCs in the way that their width should be equal to
width of table box they wrap.
According to table fixup algorithm:
https://www.w3.org/TR/css-tables-3/#fixup-algorithm
around every table-root should be generated anonymous
box wrapper.
Also this patch implements important part of CSS 2.2
spec that is currently not present in CSS Tables 3
spec draft: https://www.w3.org/TR/CSS22/tables.html#model
that portion of computed properties should be moved
from table-root to table wrapper box. Without having
this part implemented height of absolutely positioned
table with `height: auto` won't be computed correctly.
- Wrapped sequence should be inserted before first non-match
node instead of next sibling of first non-match node
- If sequence is not empty after sibling traversal it should be
wrapped
Currently placing floating blocks in anonymous nodes makes
https://stackoverflow.com/ hang so let's leave it to try
to place only absolute blocks in anonymous nodes for now.
Also it breaks flex formatting when element with floating is
flex child.
This adds support for parsing the ::placeholder pseudo-element and
injecting an anonymous layout node with that element when the input
element's data is empty.
This change makes out-of-flow blocks to be considered for joining
only to anonymous blocks that have inline children. It finally
solved the problem that out-of-flow break anonymous blocks into
chunks causing wrong layout without regressing Acid2.
Making floats to join anonymous block caused regressions in
Acid2 Test so let's leave it to be only absolute blocks who
might be joined into anonymous block when possible.
We now layout foreign objects as if they form a nested block formatting
context. This probably isn't the most correct way to do this, but it's
a start.
This removes a set of complex reference cycles between DOM, layout tree
and browsing context.
It also makes lifetimes much easier to reason about, as the DOM and
layout trees are now free to keep each other alive.
Yet another legacy "is inline-block?" condition was causing us to insert
inline nodes directly as children of inline-flex containers (instead of
wrapping them in anonymous blocks, which would then cause them to become
flex items.)
We were skipping over inline flex containers when looking for an
insertion parent. This made us not generate flex items in those cases.
This commit changes the behavior, so that non-inline-level items can
get inserted into an inline-outside parent, as long as the parent isn't
just flow-inside.
Now that we don't have to deal with the ad-hoc "inline" flag on layout
nodes anymore, we're free to simply obey the inline-outside flag from
the CSS display value when choosing whether to insert as an inline-level
node or not.
This is one of many small steps towards being able to remove the ad-hoc
Layout::Node::is_inline() in favor of honoring the CSS display value
everywhere instead.
I couldn't find anything in the specs about this, but GMail uses
empty generated boxes (`::before` and `::after` with `content: ""`)
inside a flexbox container in order to vertically center things.
The flexbox spec tells us to not generate flex items for empty
*anonymous* boxes, so we continue not doing that, but generated boxes
(any pseudo-element box) now always produce a flex item. This probably
isn't perfect either, and we'll have to revisit it for stuff like
`::first-letter`.
This is a monster patch that turns all EventTargets into GC-allocated
PlatformObjects. Their C++ wrapper classes are removed, and the LibJS
garbage collector is now responsible for their lifetimes.
There's a fair amount of hacks and band-aids in this patch, and we'll
have a lot of cleanup to do after this.
This disables this system progress bar, and instead creates one
out of pseudo elements, that can be selected and styled with the
::-webkit-progress-bar/value selectors.
Due to a missing `return` statement, we were creating two anonymous
wrapper blocks around each piece of inline content inside a flex
container.
This had no visual impact, since they ended up with 0x0 dimensions,
but we were wasting a fair bit of time running layout on them.
Make sure we use the create_anonymous_wrapper() helper function whenever
wrapping inline content in anonymous wrapper blocks. We were forgetting
to do this in one case, which led to some wrapper blocks having 0px
font-size and line-height.
This was implemented too rigidly, which made it impossible to place
floats correctly when they occurred in inline flow.
The new invariant is "all in-flow children must be either inline or
block". Out-of-flow children like floating and absolutely positioned
boxes are ignored when deciding when to generate anonymous boxes.
This makes SVG-in-HTML behave quite a bit better by following general
replaced layout rules. It also turns <svg> elements into inline-level
boxes instead of block-level boxes.
TreeBuilder wasn't taking advantage of the fact that we already have
computed style cached on each DOM::Element by the time we're
constructing a layout tree.
So instead of using the cached style, we recomputed it from scratch for
every element. This was done because invalidation was broken in many
places, but now that it's more or less trustworthy, stop recomputing
style on the fly in TreeBuilder and use what the preceding style update
pass gave us instead.
This basically cuts style computation work in half. :^)
