Summary: When loading a page, CSS selectors of the form ".class_one:hover .class_two" match class_two elements inside non-hovered class_one elements. Matching appears to be random. To reproduce: Open the testcase. Reload. Repeat. Expected: Nothing to be red. Actual: Apparently at random, on some lines (about 50% in average), "or I will turn red" is red.
Created attachment 3155 [details] testcase