CloseTag | الشروحات | CSS | تحديد العناصر عن طريق الحالة في لغة CSS | CSS Pseudo Classes

<!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>
</html>