Function apply_inline_declaration 

pub fn apply_inline_declaration(
    name: &str,
    value: &str,
    attrs: &mut Attributes,
) -> Result<bool, ParseError>

Apply one inline-style declaration (element.style layer) onto attrs, overriding whatever the stylesheet cascade resolved. A restyle passes these to RestyleWalk after the markup’s own, so an inline value beats every author / UA rule, mirroring DOM inline-style precedence. Returns Ok(true) when the property was recognized and applied, Ok(false) for an unknown property (ignored), Err for an unparseable value.