Document selectors with pseudo classes generate incorrect styles

[dfreedm]

Copied from Polymer/polymer#4885

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Selectors of the form
html:not([foo]) *
will generate
html:not([foo]):not(.style-scope).not([style-scope]) *
instead of
html:not([foo]) *:not(.style-scope):not([style-scope])

[mrkingnigg]

What is it of