This spec is very early on, and likely to change. However, it still
feels preferable to use these rather than the prefixed -webkit ones.
Plus, as we have a `::fill` on range inputs, we can use that for styling
the bar instead of inserting CSS from C++.
In conformance with the requirements of the spec PR at
https://github.com/whatwg/html/pull/9546, this change adds support for
the “switch” attribute for type=checkbox “input” elements — which is
shipping in Safari (since Safari 17.4). This change also implements
support for exposing it to AT users with role=switch.
Parse out the font-family, font-size and font-weight values from CSS
and use them to perform a kinda-best-effort lookup against the system
font library.
We also now handle standard font names like "sans-serif", "monospace"
and others.
Base/res/fonts/CsillaThin7x10.font was renamed to
Base/res/fonts/CsillaRegular10.font in 5abc03d, breaking the default
styles of <code> and <pre>.
The font lookup should still find a font variant when a non-existent
weight is specified, but that's another issue for another day.
To get the expected behavior for <center>, we needed a special text
alignment mode that centers block-level elements (and not just line
box fragments.)
