Re: [css3-ui]? Proposal for ::error pseudoelement

Tab Atkins Jr. wrote:
 > There's currently no way to change the display of the the error
 > message, but Lachlan reported yesterday that they have received a lot
 > of feedback that authors want to control this.  The display of the
 > Opera error messages is pretty simple - it's just a text string in a
 > box - so this should be fairly easy to spec up.
 >
 > I propose adding an ::error pseudoelement to the CSS3 UI spec.  You
 > can style the error message for a specific element by attaching it to
 > that element, like "input[type=email]::error {}".

How would this work if the error message is NOT "just a text string in a 
box"?

 > With one exception, the ::error pseudoelement is treated exactly like
 > an abspos box inserted into the markup via scripting.  It accepts all
 > CSS properties.

Including "content"?  What's the use case?

In any case, this seems needlessly constraining in terms of the UI a 
browser can present (e.g. what you just described would prevent a single 
notification bar that one can then use to look at all the errors).

Given that this is fundamentally browser UI, I don't think we should be 
specifying it in that level of detail.

-Boris