`play_or_cancel_animations_after_display_property_change` is called
whenever an element is inserted or removed, or it's display property
changes, but it is only required to run if we actually have animations
to play or cancel.
Reduces time spent in the aforementioned function from ~2% to ~0.03%
when loading https://en.wikipedia.org/wiki/2023_in_American_television
We don't need to iterate every property in start_needed_transitions,
only those that appear in transition-property or have an existing
transition
Reduces the time spent in start_needed_transitions from ~5% to ~0.03%
when loading https://en.wikipedia.org/wiki/2023_in_American_television
By doing this in computed properties rather than InlineLevelIterator we
only do it once per element rather than once per text fragment.
Reduces runtime of this process from ~15% to ~0.2% when loading
https://en.wikipedia.org/wiki/2023_in_American_television
We simplify these at style computation time so there is no need to
maintain them as {Number|Length}OrCalculated
Reduces the time spent in `Length::ResolutionContext::for_layout_node`
from 3.3% to 0.4% when loading
https://en.wikipedia.org/wiki/2023_in_American_television
Prevents observably calling Trusted Types, which can run arbitrary JS,
cause crashes due to use of MUST and allow arbitrary JS to modify
internal elements.
The majority of time in `compute_font()` was spent in
`font_matching_algorithm()` repeatedly computing the same values. We
now cache these values to avoid unnecessary work.
Makes the `compute_font_variation_settings` function match other
`compute_font_*` by absolutizing values passed into them. It resolves a
crash related to using `siblings-count` inside `font-variation-settings`
Co-authored-by: Sam Atkins <sam@ladybird.org>
Integrates the new `FontVariationSettings` from LibGfx into LibWeb to
enable initial variable font functionality. Currently, only the `wght`
(weight) axis is fully supported and tested. This update also introduces
support for the CSS `font-variation-settings` property.
This algorithm is used by Typed-OM for producing a list of internal
style values from a single one, for properties that take a list. We
will probably need to implement this for more StyleValues later.
Now that we don't remove whitespace when parsing, we don't need to
artificially insert it back in again when serializing. We do now need
to trim leading and trailing whitespace from UnresolvedStyleValues, as
this previously was done as part of the whitespace insertion.
This makes our serialization of UnresolvedStyleValues more correct and
gets us a few WPT passes for each property in the Typed OM tests.
Now that we don't strip out whitespace, this method was copying the
input TokenStream into a Vector, and then creating new TokenStreams
from that. So, stop doing that and use the input TokenStream instead.
