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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
img:-moz-broken ~ label {color: green}
label {color: red}
img { display: none; }
</style>
</head>
<body>
<img src="no-such-scheme:nothing" id="ffximage"/>
<label for="ffximage">Text should be green</label>
</body>
</html>