CSSConditionRule.conditionText
Previously @media rule conditions could be updated by assigning to `conditionText`. This change aligns our implementation with the CSSOM specification, which says `CSSConditionRule.conditionText` should be read-only.
CSSStyleSheet.addRule()
remove_rule()
CSSStyleSheet.replace()
CSSStyleSheet.replaceSync()
src: local(...)
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math-depth