Re: [xml-dev] Boolean attributes in XHTML/HTML5

[David Carlisle <davidc@nag.co.uk>]

On 10/02/2012 10:26, Jesper Tverskov wrote:
 > Is there an explanation why we ended up with the awkward 
disabled="disabled"?

yes it's the SGML heritage. in the short form

<foo disabled>

it is not the attribute _name_ that is given it is the _value_, if there 
is one attribute with that value allowed in the schema, you don't need 
to give the attribute name. most html parsers though didn't implement 
sgml rules and took it as an attribute name (with a value being omitted 
or ignored)  so disabled="disabled" makes both views work, html5 cut the 
ties with sgml so can relax the rules.

David

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