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<!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>