Created attachment 61325 [details] screenshot of testcase When text-rendering: optimizeLegibility; is specified, Safari 5 cannot render opentype downloadable fonts correctly. Truetype fonts work correctly. @font-face { font-family: 'Graublau Web'; src: url(./GraublauWeb.otf) format("opentype"); } html {text-rendering: optimizeLegibility;} test case in URL field - this works correctly on Windows Vista and Windows 7. - Google Chrome apppears not to be affected (not unexpected, different code path for those fonts). In the attached screenshot: Safari 5 vs Minefield (gecko) recent nightly (background window).