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LibWeb/CSS: Add flags for element-backed & tree-abiding pseudo-elements

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Generate a couple of functions for checking if a pseudo-element fits
these categories.
This commit is contained in:
Sam Atkins
2026-03-31 16:48:28 +01:00
parent b23aa38546
commit 492cfc58d9
Notes: github-actions[bot] 2026-04-08 09:38:21 +00:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/LadybirdBrowser/ladybird/commit/492cfc58d9e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8728
3 changed files with 80 additions and 7 deletions
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Documentation/CSSGeneratedFiles.md
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@@ -262,7 +262,9 @@ Each entry has the following properties:
| `alias-for` | No | Nothing | Use to specify that this should be treated as an alias for the named pseudo-element. |
| `function-syntax` | No | Nothing | Syntax for the function arguments if this is a function-type pseudo-element. Copied directly from the spec. |
| `is-allowed-in-has` | No | `false` | Whether this is a [`:has`-allowed pseudo-element](https://drafts.csswg.org/selectors/#has-allowed-pseudo-element). |
| `is-element-backed` | No | `false` | Whether this is an [element-backed pseudo-element](https://drafts.csswg.org/css-pseudo-4/#element-backed). |
| `is-pseudo-root` | No | `false` | Whether this is a [pseudo-element root](https://drafts.csswg.org/css-view-transitions/#pseudo-element-root). |
| `is-tree-abiding` | No | `false` | Whether this is a [tree-abiding pseudo-element](https://drafts.csswg.org/css-pseudo-4/#tree-abiding). |
| `property-whitelist` | No | Nothing | Some pseudo-elements only permit certain properties. If so, name them in an array here. Some special values are allowed here for categories of properties - see below. |
| `spec` | No | Nothing | Link to the spec definition, for reference. Not used in generated code. |
| `type` | No | `"identifier"` | What type of pseudo-element is this. Either "identifier", "function", or "both". |
@@ -273,6 +275,8 @@ The generated code provides:
- `Optional<PseudoElement> aliased_pseudo_element_from_string(StringView)` is similar, but returns the `PseudoElement` this name is an alias for
- `StringView pseudo_element_name(PseudoElement)` to convert a `PseudoElement` back into a string
- `bool is_has_allowed_pseudo_element(PseudoElement)` returns whether the pseudo-element is valid inside `:has()`
- `bool is_element_backed_pseudo_element(PseudoElement)` returns whether the pseudo-element is element-backed
- `bool is_tree_abiding_pseudo_element(PseudoElement)` returns whether the pseudo-element is tree-abiding
- `bool is_pseudo_element_root(PseudoElement)` returns whether the pseudo-element is a [pseudo-element root](https://drafts.csswg.org/css-view-transitions/#pseudo-element-root)
- `bool pseudo_element_supports_property(PseudoElement, PropertyID)` returns whether the property can be applied to this pseudo-element