Per bug 591737 comment comment 220, this is a follow-up to investigate whether the first summary element should be cached in HTMLDetalisElement so that HTMLDetailsElement::GetFirstSummary() is O(1).
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Per bug 591737 comment comment 220, this is a follow-up to investigate whether the first summary element should be cached in HTMLDetailsElement so that HTMLDetailsElement::GetFirstSummary() is O(1).