Syntax

  attribute attribute-name element-qualifier* (is | isnt ) defaulted. 

An operator for testing where the value of an attribute is set. It is always available, and no error is generated if the specified attribute doesn't exist or was not given a value.

The test succeeds when:

• an element attribute has a default value given in the element declaration, but has no value set in the start tag of the element.
• a data attribute has a default value given in the declaration for the external entity's notation, but has no value set in the entity declaration.

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

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