This is an implementation of the `prevent_scroll` feature in the focus
transaction system. It allows to control whether focusing an element
should prevent scrolling or not.
Spec:
https://html.spec.whatwg.org/multipage/interaction.html#dom-focusoptions-preventscroll
Testing: Existing WPT tests
Signed-off-by: abdelrahman1234567 <abdelrahman.hossameldin.awadalla@huawei.com>
This is an implementation for `scrollIntoView`. For now, it is called
when a certain element gains focus.
Testing: Existing WPT tests
Fixes: #24059
Signed-off-by: abdelrahman1234567 <abdelrahman.hossameldin.awadalla@huawei.com>
Most tests were only being run for layout-2013, not for layout-2020.
This wasn't great since layout-2020 is now the default.
So this patch unifies the lists of included tests for both layouts.
For layout-2013 this implies adding css/css-content/, css/css-logical/
and css/css-masking/clip/.
For layout-2020 this implies adding several additional css tests, and
also tests like dom/, js/, html/, etc.
