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operator   is implied    

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.



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


Purpose

An attribute test that succeeds when:

    Related Syntax
   data-attribute
 
Related Concepts
   Attribute tests on items of the "attributes" shelf
   Attributes: type tests
 
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