Steps to reproduce: 1. Load <http://xhva.net/work/css3/>. Observe the number of columns initially (3 for me). 2. Zoom in as much as possible. 3. Restore zoom level (Cmd+0). After step 3, I only get two columns, and a large empty area to the right of it. The number of columns should be the same as the computed value when first loading the page.
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