- From: Tab Atkins Jr. <jackalmage@gmail.com>
- Date: Fri, 18 Oct 2013 12:11:15 -0700
- To: James Greene <james.m.greene@gmail.com>
- Cc: Glenn Maynard <glenn@zewt.org>, Ryosuke Niwa <rniwa@apple.com>, whatwg <whatwg@lists.whatwg.org>, Tim Streater <tim@clothears.org.uk>, Boris Zbarsky <bzbarsky@mit.edu>, Ian Hickson <ian@hixie.ch>
On Fri, Oct 18, 2013 at 11:09 AM, James Greene <james.m.greene@gmail.com> wrote: > I would also love to see `getElementById` added to the HTMLElement/Element > interface. It would be nice to capitalize on that potential perf boost in > jQuery as well. There's no perf boost available for searching by id on an arbitrary element. The reason you may get a better perf for the normal functions is that documents cache a map from id->element on themselves, so you just have to do a fast hash-lookup. Arbitrary elements don't have this map (it would be way too much memory cost), so it'll fall back to a standard tree search, exactly as a querySelector would. ~TJ
Received on Friday, 18 October 2013 19:11:59 UTC