Per bug 556743 comment #47 and comment #51, we can use [Cached] in .webidl for lablable elements that would keep accessing the property fast.
Moving to p3 because no activity for at least 1 year(s). See https://github.com/mozilla/bug-handling/blob/master/policy/triage-bugzilla.md#how-do-you-triage for more information
Priority: P2 → P3
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