Re: Home for viewport-related issues

Sorry for the delayed response - this somehow missed my inbox.

Agree that we should specify explicitly what coordinate space each relevant
API is in. And great to hear VisualViewport is coming to Safari :). I don't
think anyone is actively working on @viewport any more and the prevailing
opinion in Chromium is it would hurt loading performance so it would be out
of scope. There's some useful spec text in device-adaptation related to
viewport meta though which might be useful to formalize.

+simonp@opera.com, who is the CSSOM View editor, for thoughts. Do you agree
this makes sense to go into CSSOM View? If so, should we just patch it into
the latest draft or a level 2? Or do you think it'd make sense to iterate
on it in a separate repo and merge it in when it's closer to a complete
spec?

On Tue, Jan 22, 2019 at 7:54 PM Simon Fraser <smfr@me.com> wrote:

>
> On Jan 22, 2019, at 7:44 AM, David Bokan <bokan@chromium.org> wrote:
>
> Hi www-style,
>
> I've collected some viewport-related interop research in an explainer I
> wrote a while back[1]. This doc tracked issues like how we decide what page
> scale to load a page at, how position: fixed elements and overflow: hidden
> work in the presence of pinch-zoom, etc.
>
> bballo@mozilla.com has been working on squashing some of these interop
> issues and so far we've been using my GitHub as a place to collect issues
> and discussion. I think it'd be beneficial to move the discussion into a
> more official+public place, perhaps a WICG GitHub repo. I was wondering if
> anyone had thoughts on where this might belong or if there's an existing
> spec/repo viewport work might fit well into.
>
> I think these kind of issues are closely aligned with the
> device-adaptation spec [2]. There's also the question of the visualViewport
> API spec [3]. This is currently a WICG draft but I believe others are now
> implementing it so we could probably start moving it out of "incubation".
> That's also closely related to these discussions.
>
> WDYT?
>
> Thanks,
> David
>
> [1]
> https://github.com/bokand/bokand.github.io/blob/master/web_viewports_explainer.md
> [2] https://www.w3.org/TR/css-device-adapt-1/
> [3] https://wicg.github.io/visual-viewport/index.html
>
>
> It would be great to have a spec for viewports (basically covering the
> stuff the explainer[1] talks about). That spec also needs to define what
> coordinate systems are used for ALL THE THINGS (events,
> getBoundingClientRect etc etc), as well as talking about what triggers the
> firing of scroll events. This spec feels related to CSS OM View, so I'm not
> sure if it would go into a level 2 of that spec, be its own spec.
>
> WebKIt has recently enabled the Visual Viewport API by default, so we
> support that proposal.
>
> I don't think we're as keen on the CSS @viewport rule.
>
> Simon
>
>