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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>
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