Cierto, pase por alto ese detalle. Aqui lo que el validador devuelve:
Cita:
Iniciado por validator.w3.org Error Line 32 column 82:
the name and VI delimiter can be omitted from an attribute specification only if SHORTTAG YES is specified.
... value="Valor por default" readonly /
>
"VI delimiter" is a technical term for the equal sign. This error message means that the name of an attribute and the equal sign cannot be omitted when specifying an attribute. A common cause for this error message is the use of "Attribute Minimization" in document types where it is not allowed, in
XHTML for instance.
How to fix: For attributes such as compact, checked or selected, do not write e.g <option selected ... but rather <option selected="selected" ...
Gracias por la correccion
Un saludo,
