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<!DOCTYPE html>
<html>
<head>
<style>
input:optional {
  background-color: yellow;
}
</style>
</head>
<body>
​
<h3>A demonstration of the :optional selector.</h3>
​
<p>An optional input element:<br><input></p>
​
<p>A required input element:<br><input required></p>
​
<p>The :optional selector selects form elements with no "required" attribute.</p>
​
<p><strong>Note:</strong> The :optional selector is not supported in Internet Explorer 9 or earlier versions.</p>
​
</body>
​
<!-- Mirrored from www.w3schools.com/cssref/tryit.asp?filename=trycss_sel_optional by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:11:41 GMT -->
</html>
​
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