This bug report spun from the 2nd example of attachment 386881 [details] from bug 266122. When a block-level element has 2 or more inline boxes of different line-height values (which are greater than the line-height set on that block-level element), then an outline border should encompass around the inline boxes which will make it non-rectangular. " Outlines may be non-rectangular. For example, if the element is broken across several lines, the outline is the minimum outline that encloses all the element's boxes. " http://www.w3.org/TR/CSS21/ui.html#dynamic-outlines IE9, IE10, Opera 12.12 and Opera 12.50 pass this test. Gérard