Sam Atkins 4065eb169c LibWeb: Implement CSS parsing convenience functions ...

These mostly match the API in `DeprecatedCSSParser.h`. The exception is
that `parse_selector()` returns a `SelectorList` instead of just one
`Selector`. The only uses of that are in
`ParentNode::query_selector[_all]()` which should be matching against a
list, according to the spec.

`parse_html_length()` is an odd case. It's used for `width="200"` cases
in HTML, so is not really CSS related, but does produce a StyleValue.
The values allowed in `width/height` in HTML vary per element, but they
are a lot more restricted than in CSS, so it's slightly inappropriate to
use the CSS parser for them, even though it's convenient.

We also ignore a few functions:

- `parse_line_width()`
- `parse_line_style()`
- `parse_color()`

These are all only used in `StyleResolver`, when it is given a property
value as a String. That won't happen once the old parser is removed.

2021-08-02 19:01:25 +04:30

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