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+<!DOCTYPE html>
+<html>
+ <head>
+ <style>
+ option {color: green}
+ optgroup {color: red}
+ optgroup:disabled {color: green}
+ optgroup[disabled]:disabled + optgroup {color: green}
+ optgroup:not(:disabled) {color: red}
+ optgroup[disabled]:disabled > option:default {color:blue}
+ optgroup:disabled > option:default ~ option {color:blue}
+ </style>
+ </head>
+ <body onload='document.getElementById("ogone").setAttribute("disabled", "disabled");
+ document.getElementById("one").setAttribute("selected", "selected");'>
+ <select size="7">
+ <optgroup id="ogone" label="There should be no red">
+ <option id="one">This should be blue</option>
+ <option id="two">This should be blue</option>
+ </optgroup>
+ <optgroup id="ogtwo" label="There should be no red">
+ <option id="three">There should be no red</option>
+ <option id="four">There should be no red</option>
+ </optgroup>
+ </select>
+ </body>
+</html>