Correctly format boolean tag attributes with tinymce editor plugin

Question

i am building a plugin for tinymce editor which adds some microdata to selected text, and i want to make sure the final markup will be valid. as specified by the draft microdata spec, a new item is indicated by adding the attribute itemscope to an element, for example:

<section itemscope itemtype="http://example.com/vocab/someobject" itemid="someid" >
<meta itemprop="topic" content="something very interesting" />
  ....
  other microdata stuff
</section> 

i have extended the configuration parameters of tinymce to recognize these microdata attributes:

tinyMCE.init({
    ...
    schema: "html5",
    extended_valid_elements:"@[itemscope|itemtype|itemid|itemprop|content],div,span,time[datetime]"
    ...
});

and things are generally working. however, when i use the plugin, tiny mce is still "correcting" my markup by adding an empty value to the itemscope attribute, like so: itemscope="". but the itemscope attribute is a boolean element, which AFAIU means that it should have no value.

so the question is, a) is it still valid markup if the itemscope attribute has a value? and b) if not, (how) can i configure tinymce to leave itemscope as a proper boolean attribute, and not append the ="" bit?

thanks!

Answer 1

The value of a boolean attribute must either be the empty string, or the name of the attribute itself. So, <div itemscope>, <div itemscope="">, and <div itemscope="itemscope"> are all equivalent.