When the attribute value can remain unquoted in HTML5
When the attribute value can remain unquoted in HTML5?
HTML4.01 was a SGML application. So in HTML4 quotes can be omitted if the only characters used in the value are ones currently declared as name characters: alphan开发者_Go百科umeric character, full stop, -, :, _.
Well, from the W3C working draft (13 January 2011):
The attribute value can remain unquoted if it doesn't contain spaces or any of " ' ` = < or >.
But if I put in the attribute value any other character than alphanumeric character, full stop, -, :, _ and remain it unquoted validator.w3.org doesn't validate my html document as valid HTML5 document.
So the question is still open. Is it a mistake of HTML5 working draft or is it a mistake on validate.w3.org?
No, the working draft is fine and the validator is working correctly.
Try this
<!DOCTYPE html>
<title>test</title>
<div class=%test$></div>
at http://validator.w3.org/#validate_by_input
The validator is happy with both the % and $ characters. So what exactly are you testing?
This article on unquoted attribute values in HTML and CSS will answer your question. There’s also a tool: http://mothereff.in/unquoted-attributes
Unless you are sticking in the xmlns attribute to your html element, rendering your document as XHTML 5 (the XML serialization of HTML 5), using unquoted values with appropriate characters validates as proper HTML 5.
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