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<!DOCTYPE html>
<html>
<head>
<style>
input:-moz-read-only { /* For Firefox */
    background-color: yellow;
}

input:read-only {
    background-color: yellow;
}
</style>

<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "//hm.baidu.com/hm.js?73c27e26f610eb3c9f3feb0c75b03925";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
</head>
<body>

<h3>A demonstration of the :read-only selector.</h3>

<p>A normal input element:<br><input value="hello"></p>

<p>A readonly input element:<br><input readonly value="hello"></p>

<p>The :read-only selector selects form elements with a "readonly" attribute.</p>

<p><strong>Note:</strong> The :read-only selector is not supported in Internet Explorer.</p>

<p><strong>Note:</strong> Firefox supports an alternative, the :-moz-read-only property.</p>

</body>
</html>