Am Sonntag, 27. April 2014 15:56:26 UTC+2 schrieb Jeremy Ruston:
>
>
> The spec doesn't allow digits in HTML attribute names, but in practice it 
> seems that most browsers are quite happy with them.
>

Which specs are you referring to?

For HTML5 I found:

Attributes have a name and a value. Attribute names must consist of one or 
> more characters other than the space 
> characters<http://www.w3.org/TR/html5/infrastructure.html#space-character>, 
> U+0000 NULL, U+0022 QUOTATION MARK ("), U+0027 APOSTROPHE ('), ">" 
> (U+003E), "/" (U+002F), and "=" (U+003D) characters, the control 
> characters<http://www.w3.org/TR/html5/infrastructure.html#control-characters>,
>  
> and any characters that are not defined by Unicode. In the HTML syntax, 
> attribute names, even those for foreign 
> elements<http://www.w3.org/TR/html5/syntax.html#foreign-elements>, 
> may be written with any mix of lower- and uppercase letters that are an ASCII 
> case-insensitive<http://www.w3.org/TR/html5/infrastructure.html#ascii-case-insensitive>match
>  for the attribute's name.


http://www.w3.org/TR/html5/syntax.html#attributes-0 

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