126646 2014-01-08 10:46:06 -0800 Subpixel layout: desiredColumnWidth in RenderBlock::calcColumnWidth() needs flooring. 2014-01-14 16:39:33 -0800 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED INVALID P2 Normal --- 126283 1 zalan zalan jonlee simon.fraser webkit-bug-importer oldest_to_newest 965545 0 zalan 2014-01-08 10:46:06 -0800 LayoutUnit desiredColumnWidth = std::max<LayoutUnit>(0, ((availWidth - ((desiredColumnCount - 1) * colGap)) / desiredColumnCount)) produces different CSS pixel results when subpixel is off. failed case: fast/events/document-elementFromPoint.html fast/multicol/break-properties.html fast/multicol/column-break-with-balancing.html fast/multicol/float-paginate-complex.html fast/multicol/layers-in-multicol.html fast/multicol/overflow-across-columns-percent-height.html fast/multicol/overflow-across-columns.html fast/multicol/overflow-unsplittable.html fast/multicol/scrolling-overflow.html fast/multicol/span/clone-flexbox.html fast/multicol/span/clone-summary.html fast/multicol/table-vertical-align.html fast/multicol/vertical-lr/break-properties.html fast/multicol/vertical-lr/column-break-with-balancing.html fast/multicol/vertical-lr/float-multicol.html fast/multicol/vertical-rl/break-properties.html fast/multicol/vertical-rl/column-break-with-balancing.html fast/multicol/vertical-rl/float-multicol.html fast/multicol/newmulticol/column-rules-fixed-height.html fast/multicol/newmulticol/columns-shorthand-parsing.html fast/multicol/newmulticol/layers-in-multicol.html 965561 1 zalan 2014-01-08 11:17:28 -0800 If we start snapping columns widths to CSS pixels, we lose subpixels while layouting the columns content. 965654 2 simon.fraser 2014-01-08 15:22:04 -0800 Need to talk to Dave Hyatt. 968095 3 zalan 2014-01-14 16:39:33 -0800 Matches FF(v26) rendering.