Function style::stylesheets::supports_rule::parse_condition_or_declaration

pub fn parse_condition_or_declaration<'i, 't>(
    input: &mut Parser<'i, 't>
) -> Result<SupportsCondition, ParseError<'i>>

supports_condition | declaration https://drafts.csswg.org/css-conditional/#dom-css-supports-conditiontext-conditiontext