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Test Info:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<!-- The div's border should hide the select's button -->
<!-- z-index:1 works around an unrelated bug in B2G -->
<div style="position:absolute; z-index:1; box-sizing:border-box; width:402px; height:202px; border-right:50px solid black;"></div>
<div><select style="background:transparent; border-radius:0; box-sizing:content-box; padding:50px; width:300px; height:100px; border:1px solid black; direction:ltr"></select></div>
<div style="position:absolute; z-index:1; box-sizing:border-box; width:402px; height:202px; border-left:50px solid black;"></div>
<div><select style="background:transparent; border-radius:0; box-sizing:content-box; padding:50px; width:300px; height:100px; border:1px solid black; direction:rtl"></select></div>
</body>
</html>