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LibWeb: Don't treat "--" as a valid custom property name

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This is reserved for future use by CSS.
This commit is contained in:
Tim Ledbetter 2025-06-25 11:43:14 +01:00 • committed by Sam Atkins
commit bf37f3400e
Notes: github-actions[bot] 2025-06-25 16:10:47 +00:00
3 changed files with 28 additions and 1 deletions
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10
Libraries/LibWeb/CSS/PropertyName.h
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@ -11,11 +11,19 @@
namespace Web::CSS {
static bool is_invalid_custom_property_name_string(StringView string)
{
// https://drafts.csswg.org/css-variables-2/#typedef-custom-property-name
// The <custom-property-name> production corresponds to this: it’s defined as any <dashed-ident>
// (a valid identifier that starts with two dashes), except -- itself, which is reserved for future use by CSS.
return string == "--"sv;
}
// https://drafts.css-houdini.org/css-typed-om-1/#custom-property-name-string
static bool is_a_custom_property_name_string(StringView string)
{
// A string is a custom property name string if it starts with two dashes (U+002D HYPHEN-MINUS), like --foo.
return string.starts_with("--"sv);
return string.starts_with("--"sv) && !is_invalid_custom_property_name_string(string);
}
}