On Tue, 11 Jan 2011 17:06:33 -0800
Jeff <codedr...@gmail.com> wrote:
> Doesn't HTML5 microdata use the <meta> element for this purpose?
That doesn't really work outside XHTML.
The problem is that the HTML5 parsing algorithm hoists <meta> elements
into the document head. In other words:
<!doctype html>
<head><title>Example</title></head>
<body>
<meta name="foo" content="bar">
<script>
var heads = document.getElementsByTagName('head');
var metas = heads[0].getElementsByTagName('meta');
window.alert(metas[0].name + metas[0].content);
</script>
</body>
Will alert "foobar". The browser assumes that you really meant to put
the <meta> element in the head. This behaviour is inherited from legacy
browsers who made this assumption because <meta> has never been allowed
in the <body>.
RDFa's content attribute is a nice solution for hiding a machine
readable value, and somewhat less of a hack:
e.g.
<p about="#i" rel="foaf:based_near">
I live in <span property="geo:lat_long"
content="50.875627;0.017855">Lewes (50°52′N, 0°1′E)</span>
</p>
--
Toby A Inkster
<mailto:m...@tobyinkster.co.uk>
<http://tobyinkster.co.uk>
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