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<html><head><style>p#demo { text-decoration: underline;}</style></head><body><p id="demo">Hello world!</p><p>Click the "Try it" button to change the color of the underline.</p><button onclick="myFunction()">Try it</button><script>function myFunction() { document.getElementById("demo").style.textDecorationColor = "red";}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_style_textdecorationcolor by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:53 GMT --></html>