User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ja-KS; rv:188.8.131.52) Gecko/2008070208 Firefox/3.0.1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1a2pre) Gecko/20080829063055 Minefield/3.1a2pre Calculation of width of float uses font metrics of :first-letter for all letters off its content. caclulation of width other than :first-letter should use float's font metrics. Reproducible: Always Steps to Reproduce: 1.Show testcase 2. Actual Results: All lines that has same text should be displayed widh same width. Expected Results: Red boxed line and Blue boxed line has incorrect width. But, at red boxed line, when after applying :hover, its width will be correct. Green boxed lines uses only float, not using :first-letter Red boxed lines uses float and :first-letter. And, additionally it uses :hover that causes reflow of text. Blue boxed lines also uses float and :first-letter, but not uses :hover.