Re: [css3-values] Interaction of vw/vh and scrollbars

On Tue, Dec 4, 2012 at 9:01 AM, Sylvain Galineau <sylvaing@microsoft.com>wrote:

>
> [Boris Zbarsky:]
> >
> > On 12/3/12 6:02 PM, Tab Atkins Jr. wrote:
> > > In the two browsers that currently support vw/vh, Chrome and IE,
> > > neither one pays any attention to scrollbars.
> >
> > Neither does Gecko (which has vh/vw on the Aurora channel at this point),
> > fwiw.
> >
> Wouldn't such a requirement also make implicit assumptions about
> scrollbars'
> UI model? On many touch devices scrollbars are overlaid on top of the
> content
> only when the user is touching/panning the screen. Recalculating viewport
> units
> and reflowing when that happens would clearly be horrible; preventing the
> app
> from using that part of the viewport would also be sub-optimal, if only
> because
> these scrollbar designs were at least partly motivated by the desire to
> avoid
> wasting precious screen real estate. I wouldn't expect such
> implementations to
> bother fixing the testcase fails they would get from this requirement.
>
>
Overlay style scrollbars do not change the layout width/height of the page
and so should be excluded from vw/vh, IMO.

- James