[whatwg] Fullscreen CSS

[Tab Atkins Jr.]

On Mon, Nov 14, 2011 at 3:10 PM, Robert O'Callahan <robert at ocallahan.org> wrote:
> On Tue, Nov 15, 2011 at 10:54 AM, Tab Atkins Jr. <jackalmage at gmail.com>
> wrote:
>>
>> I think we should go the route that the <dialog> element did in Ted's
>> change proposal and have a pseudo-element that gets created when an
>> element is fullscreened.  Simple and easy, and trivial for the author
>> to manipulate to get most effects they could want.
>
> Interesting. I did not know about that.
>
> That proposal requires layout engine changes --- specially, at least one new
> rule for CSS stacking contexts in the infamous "appendix E". Also, it
> doesn't address situations where an ancestor of the <dialog> or fullscreen
> element has 'opacity', 'transform', 'filter', 'mask' or 'clip-path' (and
> maybe other things I've forgotten).

Hm, why would it require stacking-level changes?  One obvious way to
get it to act "correctly" is to make it wrap around the element, like
the old ::outside pseudo-element proposal.  Then it's trivial.

> I think we should probably define a unified mechanism that can be used for
> the fullscreen element and the <dialog> element and anything else like it we
> need. And figure out what happens if you make part of a page fullscreen and
> that uses <dialog>. Or if you have nested <dialog>s mixed with fullscreen...
> Hmm.

Yes, we should give some thought to how these combine.

~TJ