IETester is a tool that runs the rendering and javascript engines from IE8b1, IE7, IE6, and IE5.5 in a single process so you can see how each one mangles your site in it’s own unique way (currently in beta).
While investigating line-height Eric Meyer used font-family: Webdings to display “Oy!” (Webdings doesn’t contain ‘O’, ‘y’, or ‘!’). Firefox 3 unexpectedly displayed “Oy!”, which, it seems, is technically correct, leaving him asking “which is less correc
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