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diff --git a/layout/reftests/bugs/315920-28c.html b/layout/reftests/bugs/315920-28c.html
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+<!DOCTYPE html>
+<html>
+ <head>
+ <style>
+ optgroup {color: red}
+ option {color: red}
+ optgroup[disabled]:disabled {color: green}
+ optgroup[disabled]:disabled + optgroup:not([disabled]):not(:disabled) {color: blue}
+ optgroup[disabled]:disabled > option{color: green}
+ optgroup:not([disabled]):not(:disabled) > option {color: blue}
+ </style>
+ </head>
+ <body onload='document.getElementById("ogtwo").removeAttribute("disabled");
+ document.getElementById("ogone").setAttribute("disabled", "disabled");'>
+ <select size="7">
+ <optgroup id="ogone" label="opt group 1">
+ <option id="one">Should be no red</option>
+ <option id="two">Should be no red</option>
+ </optgroup>
+ <optgroup id="ogtwo" label="opt group 2" disabled="disabled">
+ <option id=three>Should be no red</option>
+ <option id=four>Should be no red</option>
+ </optgroup>
+ </select>
+ </body>
+</html>