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<html><head><style> #myDIV { margin: auto; border: 1px solid black; outline: coral solid 5px; width: 300px; height: 300px; animation: mymove 5s infinite;}@keyframes mymove { 50% {outline-width: 50px;}}</style></head><body><h1>Animation of outline-width</h1><p>Gradually change the outline-width property from 5px to 50px, and back to 5px:<p><div id="myDIV"></div></body><!-- Mirrored from www.w3schools.com/cssref/tryit.php?filename=trycss_anim_outline-width by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 16:50:31 GMT --></html>