Re: Styling form control elements

On Tue, Dec 10, 2013 at 8:24 PM, Tab Atkins Jr. <> wrote:
> On Wed, Dec 11, 2013 at 2:46 PM, Boris Zbarsky <> wrote:
>> On 12/10/13 6:30 PM, Jonas Sicking wrote:
>>> I would also think that you need properties to position the ::popout.
>> Oh, yes.  The extra fun here is:
>> 1)  Should the popout be able to paint outside the browser window? Right
>> now, comboboxes (select size=1) can but normal CSS boxes cannot.
>> 2)  The popout needs to pop out in different directions (up or down)
>> depending on the screen position of the anchor, the popout dimensions, and
>> the screen dimensions.
>> 3)  The size of the popout needs to be capped in some way.
>> Maybe all that logic should just live in the UA and the page just needs a
>> way of saying "here is a popout thingie, anchor it here".
> Yes, the "popout thingy" probably needs to be a specialized 'display'
> value that is only valid on the popout pseudo, so we can bottle the
> magic precisely.

Allowing the popout thingy to go outside of the browser window, while
at the same time allowing it to be heavily customized, scares me a
lot. At some it allows click-jacking parent windows. Or even rendering
input controls in the parent window and steal data that the user
thinks he's entering into the parent.

Even just detecting where in the parent window the user is hovering
the mouse or clicking could leak critical data if the user is unaware.

Can we define a subset of styles that are safe?

I had imagined that we pretty quickly would fall back to rendering the
popout only inside the same window. Sadly.

/ Jonas

Received on Wednesday, 11 December 2013 23:04:55 UTC