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<!DOCTYPE html>
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<html>
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<head>
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<style>
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input { -moz-appearance: textfield; }
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</style>
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<script>
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function boom()
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{
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window.getComputedStyle(x, "::-moz-number-spin-down").getPropertyValue("color");
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}
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</script>
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<body onload="boom();">
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<input type="number" id="x">
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</body>
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</html>
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