The following CSS fragment is incorrectly reported as invalid. (under selected grammar=css2.1)

test case 1:

[attr=val ] {}


(note: whitespace before ] ).

Other tests with whitespace inserted in other possible positions show correct behaviour.


The following test cases all fail similarly

test case 2:

[attr~=val ] {}


test case 3:

[attr|=val ] {}

etc for other operators


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Notes: This bug is confined to the (attr OP ident) cases. The case of (attr OP string) is not affected. (See test case 4 below.)



Suggest adding additional test cases:

test case 4:

[attr = "val" ] {}

test case 4 is correctly reported as valid.


--
test case 5:

[attr=val/**/] {}

test case 5 is correctly reported as valid.
--

test case 6:

[attr ] {}

(attribute existence test, whitespace before ]) test case 6 is correctly reported as valid.