[selectors] Relax `|=` to also match value parts separated by spaces

[css-properties-values] CSSOM for multi-name `@property`

[css-values-5] Feedback on `<size-keyword>` for `calc-size()`

Isue#14201

[css-inline-3] Add `hanging` value to `text-box-edge`

[css-forms-1] Should `select:not(:open)::picker(select)` use `display: none !important`?

[css-color-4] Use the phrase "prepare both colors for conversion" seems wrong in color interpolation algorithm

[css-color-4] Clarify how `hue` interacts with hue interpolation when both `hue` components are missing

[mediaqueries-5] Introduce `prefers-reduced-ai` media feature and `PreferenceManager` integration

[css-flexbox-1] Flex container intrinsic sizing should disregard flex items with 'visibility:collapse'