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Re: Selectors, vendor prefixes (again...) and IE9

From: L. David Baron <dbaron@dbaron.org>
Date: Tue, 18 May 2010 07:40:17 -0700
To: Alan Gresley <alan@css-class.com>
Cc: Daniel Glazman <daniel.glazman@disruptive-innovations.com>, Sylvain Galineau <sylvaing@microsoft.com>, "www-style@w3.org" <www-style@w3.org>
Message-ID: <20100518144017.GA11859@pickering.dbaron.org>
On Tuesday 2010-05-18 18:11 +1000, Alan Gresley wrote:
> And this is what I am questioning. A pseudo element is a
> manipulation of the DOM by CSS. ::first-letter creates a pseudo line
> box (much like span) and ::first-line changes the formatting of a
> series of line boxes. ::before or ::after generates pseudo element.
> 
> To select (highlight) content of any part of a web document is a
> user action. I can either select, hover, click or bring into focus
> various elements via a mouse, keyboard or other device that acts
> with a UA.
> 
> With the default selection of UA (using Windows), the background
> becomes a opaque or transparent blue (seen with images) and black
> text is changed to white. Why is this considered so different from
> :hover, :active, :focus?

::selection is a pseudo-element for a very simple reason:  it has to
apply to *part* of an element (the part that's selected).
Pseudo-classes either match an element or not; they can't apply to
part.

-David

-- 
L. David Baron                                 http://dbaron.org/
Mozilla Corporation                       http://www.mozilla.com/
Received on Tuesday, 18 May 2010 14:40:49 GMT

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