Tests various selector combinations, containing unknown pseudo element selectors.

Basic selector tests:
::-webkit-slider-thumb should match: PASS
::-webkit-slider-thumb, where HTML is not default namespace should not match: PASS
*|::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
html|::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
#foo::-webkit-slider-thumb should match: PASS
.bar::-webkit-slider-thumb should match: PASS
#foo::-webkit-slider-thumb, where HTML is not default namespace should not match: PASS
.bar::-webkit-slider-thumb, where HTML is not default namespace should not match: PASS
html|#foo::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
html|.bar::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
*|#foo::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
input::-webkit-slider-thumb should match: PASS
input#foo::-webkit-slider-thumb should match: PASS
input.bar::-webkit-slider-thumb should match: PASS
input::-webkit-slider-thumb, where HTML is not default namespace should not match: PASS
input#foo::-webkit-slider-thumb, where HTML is not default namespace should not match: PASS
input.bar::-webkit-slider-thumb, where HTML is not default namespace should not match: PASS
html|input::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
html|input#foo::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
html|input.bar::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
*|input#foo::-webkit-slider-thumb, where HTML is not default namespace should match: PASS
input[type=range]::-webkit-slider-thumb should match: PASS
input#foo[type=range]::-webkit-slider-thumb should match: PASS
input.bar[type=range]::-webkit-slider-thumb should match: PASS

Shouldn't ignore selector after the unknown pseudo element:
::-webkit-slider-thumb:disabled should not match: PASS
input::-webkit-slider-thumb:disabled should not match: PASS
#foo::-webkit-slider-thumb:disabled should not match: PASS
input#foo::-webkit-slider-thumb:disabled should not match: PASS
input.bar::-webkit-slider-thumb:disabled should not match: PASS
input[type=range]::-webkit-slider-thumb:disabled should not match: PASS

Should not match disabled input, because the disabled state is on the input, not the thumb:
::-webkit-slider-thumb:disabled should not match: PASS
input::-webkit-slider-thumb:disabled should not match: PASS
#foo::-webkit-slider-thumb:disabled should not match: PASS
input#foo::-webkit-slider-thumb:disabled should not match: PASS
input.bar::-webkit-slider-thumb:disabled should not match: PASS
input[type=range]::-webkit-slider-thumb:disabled should not match: PASS

Should match :hover when the mouse is over the slider thumb:
::-webkit-slider-thumb:hover should match: PASS
input::-webkit-slider-thumb:hover should match: PASS
#foo::-webkit-slider-thumb:hover should match: PASS
input#foo::-webkit-slider-thumb:hover should match: PASS
input.bar::-webkit-slider-thumb:hover should match: PASS
input[type=range]::-webkit-slider-thumb:hover should match: PASS

Should match when combined with descendant selectors:
#baz input::-webkit-slider-thumb should match: PASS
#baz #foo::-webkit-slider-thumb should match: PASS
#baz input#foo::-webkit-slider-thumb should match: PASS
#baz input.bar::-webkit-slider-thumb should match: PASS
#baz input[type=range]::-webkit-slider-thumb should match: PASS
.qux input::-webkit-slider-thumb should match: PASS
.qux #foo::-webkit-slider-thumb should match: PASS
.qux input#foo::-webkit-slider-thumb should match: PASS
.qux input.bar::-webkit-slider-thumb should match: PASS
.qux input[type=range]::-webkit-slider-thumb should match: PASS