<html>
<head>
<style>
input:read-write {
background-color: yellow;
}
</style>
</head>
<body>
<h1>Demo of the :read-write selector</h1>
<p>The :read-write selector selects form elements with no "readonly" attribute:</p>
<p>A normal input element:<br><input value="hello"></p>
<p>A readonly input element:<br><input readonly value="hello"></p>
</body>
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</html>