The following tests imported in the bug 148805 fail due to 1px differences: imported/w3c/css/css-multicol-1/multicol-basic-001.html imported/w3c/css/css-multicol-1/multicol-basic-002.html imported/w3c/css/css-multicol-1/multicol-basic-003.html imported/w3c/css/css-multicol-1/multicol-basic-004.html imported/w3c/css/css-multicol-1/multicol-count-large-001.xht imported/w3c/css/css-multicol-1/multicol-count-large-002.xht imported/w3c/css/css-multicol-1/multicol-rule-002.xht imported/w3c/css/css-multicol-1/multicol-rule-px-001.xht imported/w3c/css/css-multicol-1/multicol-rule-stacking-001.xht imported/w3c/css/css-multicol-1/multicol-shorthand-001.xht imported/w3c/css/css-multicol-1/multicol-span-all-block-sibling-003.xht imported/w3c/css/css-multicol-1/multicol-rule-fraction-003.xht imported/w3c/css/css-multicol-1/multicol-span-all-margin-nested-firstchild-001.xht
<rdar://problem/22580076>
imported/w3c/css/css-multicol-1/multicol-count-computed-002.xht has the same problem.