On Tue, Feb 24, 2015 at 12:34 AM, Tab Atkins Jr. <jackalm...@gmail.com> wrote:
> On Mon, Feb 23, 2015 at 8:16 PM, Ryosuke Niwa <rn...@apple.com> wrote: > >> On Feb 23, 2015, at 5:40 PM, Dean Jackson <d...@apple.com> wrote: > >> At the recent Houdini meeting there was a vague agreement between the > browser engines on adding a way for elements to be notified when their size > changes. We've run into a number of scenarios where this is extremely > useful, and is otherwise difficult or annoying (e.g. checking your size on > a timer). > >> > >> The idea was to allow the resize event on elements. I don't really care > what the solution is, so maybe someone here can come up with a better idea > (size observers?). And of course there are a lot of details to be worked > out. > > > > I would like it be an async event on an element although we might want > it to fire earlier than setTimeout(~, 0) to avoid FOC (maybe the same > timing as rAF?). I don't think end-of-microtask makes sense as that may > force too many layouts. > > Yeah, you almost certainly want to tie it to rAF timing. > To support this without missing a frame we'd have to force an extra layout before rAF to queue the event. That does mean we'd do one extra layout per frame if your resize handler changed anything. - E
