truewhen the attribute has no set value, and
isntreverses the result.
attribute attribute-name (of element-expression)? (is | isnt) implied
is implied attribute type test succeeds when the referenced element or data attribute has no set
value, either in the start tag or in the element declaration. Otherwise, the test fails. Using
is reverses the results.
repeat over attributes as a output key of attribute a || "=%"%v(a)5"%n" when attribute a isnt implied again
Unlike most other attribute references, no error occurs if the specified attribute doesn't exist, or was not given a value, since the test does not actually use the value.
If the element-expression references an element that does not exist, or the specified attribute
is not declared, the
is form of the test always fails, and the
isnt form always