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FW: Defining safe areas for media devices and set top boxes

From: Belov, Charles <Charles.Belov@sfmta.com>
Date: Fri, 10 Dec 2010 10:13:23 -0800
Message-ID: <E17F75B6E86AE842A57B4534F82D03769C33E1@MTAMAIL.muni.sfgov.org>
To: <www-style@w3.org>
Cc: <rocallahan@gmail.com>, "Joao Eiras" <joao-c-eiras@telecom.pt>, "Robert O'Callahan" <robert@ocallahan.org>
Robert O'Callahan wrote on Thursday, December 09, 2010 6:58 PM
> On Fri, Dec 10, 2010 at 1:39 PM, Belov, Charles
<Charles.Belov@sfmta.com> wrote:

>>	Border images might be used to ensure that the unsafe area
doesn't contain any 
>>black space.  If one resizes the viewport, then there will be black
space around the
>> page, which may not fit in with the rest of the page's design.
	
> OK, that is easily done if the browser displays the page background
outside the bounds
>of the viewport. For example, an author could write:

>html {
>  background: url(top.png) top -20px center,
>                       url(left.png) left -20px center,
>                       url(right.png) right -20px center,
>                       url(bottom.png) bottom -20px center; }

>If top.png and bottom.png are 20px high, and left.png and right.png are
20px wide, this >would draw the four images in the unsafe area, assuming
the browser has set the CSS 
>viewport to the safe area.

>>	In any case, it would be the consumer who would have to resize
their viewport
	
> Why? Why can't a TV browser just set the CSS viewport to the safe area
of the TV?

The TV browser has no way of knowing whether the TV set it is displaying
on needs a safe area.  But if you mean, why can't TV browsers be
programmed to always allow for a safe area whether a safe area is needed
on a particular set or not, they probably can be.

http://en.wikipedia.org/wiki/Safe_area	


Hope this helps,
Charles Belov
SFMTA Webmaster
Received on Friday, 10 December 2010 18:17:23 GMT

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