Michael A. Puls II schrieb:
On Wed, 04 Nov 2009 05:03:49 -0500, Markus Ernst <[email protected]> wrote:
Tab Atkins Jr. schrieb:
On Tue, Nov 3, 2009 at 8:21 PM, Michael A. Puls II
<[email protected]> wrote:
On Tue, 03 Nov 2009 21:05:26 -0500, Curtiss Grymala <[email protected]>
wrote:
For instance, if I create a level 1 header that looks like:
<h1 src="/example.png">This is a header</h1>
The text "This is a header" would be replaced with the image that's
located at /example.png. However, if /example.png returns a 404 error,
the text would be displayed instead.
Opera supports this with css extensions.
This is supported in the CSS specs properly, via the content property.
*[src] {
content: attr(src,url);
}
If I understand things correctly, your example seems a little bit
confusing to me. The *[src] selector selects elements with a src
attribute specified, which does not apply to <h1> (if valid HTML5)
*[data-my-src] {}
<h1 data-my-src="">
While experimenting with the validator (at validator.w3.org), I found
that it does actually not complain about <h1 src="whatever.gif">. Thus,
Tab's example would be perfectly valid. The validator even seems to
accept any custom attribute name on any element - this is said to be
valid HTML5:
<!doctype html>
<html>
<body>
<h1 foo="bar">Huhu</h1>
</body>
</html>
I tried to find info about this in the spec, but only found:
3.2.1: Authors must not use elements, attributes, and attribute values
that are not permitted by this specification or other applicable
specifications.
3.2.3: Custom data attributes (e.g. data-foldername or data-msgid) can
be specified on any HTML element, to store custom data specific to the page.
According to 3.2.3.8 custom data attribute names must begin with
"data-". I did not find anything on other custom attributes allowed.
Is this a mistake in the validator, due to its experimental state, or is
there something missing in the spec?
