HTML exercises

CSS Properties: How to set the border-width is animatable?

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HTML Code:

<!DOCTYPE html>
<title>How to set the border-width is animatable</title>
<style type="text/css"> 
#xyzdiv {
width: 200px;
height: 150px;
border: 1px solid black;
-webkit-animation: mymove 5s infinite;
animation: mymove 5s infinite;
@keyframes mymove {
50% {border-width: 20px;
border-color: #22CF64;
<p>w3resource Tutorial</p>
<div id="xyzdiv">Animatable border</div>
<p><b>Note:</b> The border-width property does not work alone.</p>

Live Demo:

See the Pen border-animatable-width-answer by w3resource (@w3resource) on CodePen.

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