Consider merging https://chromium.googlesource.com/chromium/blink/+/86556ca5bbb8c21887df53d01becdd6daef96774 We were not setting needsRecalc on sibling selectors after the first one. Instead, keep a count of the max number of sibling selectors we see in any stylesheet and setNeedsRecalc on that number of siblings. http://crbug.com/304139
Fixed that already, and in a better way too :)
<rdar://problem/18846930>