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<html xmlns="http://www.w3.org/1999/xhtml"> <head> <script> function boom() { var p = document.getElementById("p"); window.getComputedStyle(p, null).getPropertyValue("right"); } </script> </head> <body onload="boom();"> <p id="p" style="position: relative; left: 3ch;">foo</p> </body> </html>