[whatwg] Proposal: Adding methods like getElementById and getElementsByTagName to DocumentFragments

[Boris Zbarsky]

On 10/22/13 2:42 PM, Ryosuke Niwa wrote:
> Because of HTMLCollection's name getter, all major browsers must be capable of a id+name lookup at every element (since Element has getElementsByTagName that returns a HTMLCollection).

While true, in practice pretty much no one uses the name getter on that 
object, so nothing right now forces browsers to implement it in a 
particularly efficient (as opposed to simple) way.

-Boris