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<!DOCTYPE html> <html> <head> <style> input:optional { background-color: yellow; } </style> </head> <body> <h1>Demo of the :optional selector</h1> <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> </body> <!-- Mirrored from www.w3schools.com/cssref/tryit.php?filename=trycss_sel_optional by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:38:45 GMT --> </html>
