W3C home > Mailing lists > Public > www-style@w3.org > May 2010

Re: [css-3 colors] Transparent backgrounds

From: Brad Kemper <brad.kemper@gmail.com>
Date: Mon, 24 May 2010 09:57:21 -0700
Cc: Alberto Lepe <dev@alepe.com>, www-style@w3.org
Message-Id: <FBC1CCB6-B94D-4F79-ABB0-0B985EFD0C5B@gmail.com>
To: David Singer <singer@apple.com>
Yes, I agree. This is not a CSS issue; it is a "what's behind the viewport" issue. Webkit can render transparent viewport backgrounds, as it does in Dashboard, but it doesn't need to have the Safari background be transparent to show other tabs or other apps. I would be kind of cool to show the appropriate slice of the desktop picture, but that actually is likely to cause more problems than anything else (for existing content that might have transparent set on the background), and it is truly a UA design choice, not CSS issue. 

The main thing I have wanted to use transparent viewport backgrounds for is iframe viewports, to blend with the content that holds the iframe.


On May 24, 2010, at 9:44 AM, David Singer wrote:

> Surely the question of what is 'behind' a transparent background is platform and UA dependent?  Photoshop, for example, gives you a checkerboard, which I doubt many would like :-(.
> 
> On May 23, 2010, at 22:48 , Alberto Lepe wrote:
> 
>> On 13 May 2010 15:22, timeless <timeless@gmail.com> wrote:
>> On Thu, May 13, 2010 at 3:35 AM, Simon Fraser <smfr@me.com> wrote:
>> > You really want the browser throwing up dialogs because someone used a CSS
>> > rule in a web page?
>> 
>> I really really don't :)
>> 
>> 
>> 
>> I also agree that any message to allow/prevent background transparency may be strange for common users.
>> 
>> These are some of the situations in which I think it may be problematic to allow background transparency (In which it shows your own desktop and not other web pages):
>> 
>> If a 100% transparent background is used in full screen without any element could confuse the user  preventing the user to do anything until they realize its a webpage (however, usually the browser ask you if you want to open that page in full screen mode).
>> 
>> An error message (simulating the OS) could be presented to the user in many fake situations. However, even without transparency it is possible to create fake alert messages (so I'm not sure if this is a valid case).
>> 
>> Could someone comment other cases in which it may present a security risk or problem of  using background transparency? (It could help to show if a message or setting should be specify for this matter). 
> 
> David Singer
> Multimedia and Software Standards, Apple Inc.
> 




Received on Monday, 24 May 2010 16:57:57 GMT

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