parse_attribute_value

style::custom_properties

Function parse_attribute_value 

Source 
fn parse_attribute_value(
    name: &Atom,
    attribute_data: &AttributeData,
    url_data: &UrlExtraData,
    attribute_tracker: &mut AttributeTracker<'_>,
) -> Result<ComputedValue, ()>
Expand description

Attribute values may reference other substitution functions we may need to process. See step 6: https://drafts.csswg.org/css-values-5/#attr-substitution