x
<html><head><style> #main { border: 15px solid transparent; padding: 15px; border-image: url(border.png); border-image-slice: 30; border-image-width: 10px; border-image-repeat: round;}</style></head><body><h1>Change border-image-width with JavaScript</h1><p id="main">This element uses an image as a border.</p><p>Click the "Try it" button to change the value of the borderImageWidth property.</p><button onclick="myFunction()">Try it</button><script>function myFunction() { document.getElementById("main").style.borderImageWidth = "20px 30px";}</script></body></html>