Return type: Boolean
Returns:       

True when the attribute or data attribute has no value set, and false otherwise. Replacing is with isnt will reverse the results.

  attribute attribute-name element-qualifier*
     (indexer")? (is | isnt) implied

An attribute test that succeeds when:

• the reference element attribute has no value set, either in the start tag or in the element declaration
• the data attribute has no value set, either in the start tag or in the element declaration

Related Syntax    data-attribute

Related Concepts    Attribute tests on items of the "attributes" shelf    Attributes: type tests

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