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

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HTML Code:

<!DOCTYPE html><!-- Declares the document type as HTML -->
<html><!-- Root element of the HTML document -->
<head><!-- Contains metadata about the HTML document -->
<title>How to set the border-right-width animatable</title><!-- Sets the title of the HTML document -->
<style type="text/css"> /* Begins a CSS style block */
#mydiv { /* Defines a CSS rule for an element with the ID 'mydiv' */
width: 200px; /* Sets the width of the element to 200 pixels */
height: 150px; /* Sets the height of the element to 150 pixels */
border: 1px solid #22CF64; /* Sets the border of the element to a 1-pixel solid line with the color #22CF64 */
-webkit-animation: mymove 5s infinite; /* Applies a WebKit animation named 'mymove' to the element, lasting for 5 seconds and repeating infinitely */
animation: mymove 5s infinite; /* Applies an animation named 'mymove' to the element, lasting for 5 seconds and repeating infinitely */
@keyframes mymove { /* Defines a keyframe animation named 'mymove' */
50% {border-right-width: 15px;} /* Specifies the CSS properties for the element at the 50% mark of the animation, setting the width of the right border to 15 pixels */
</style><!-- Ends the CSS style block -->
</head><!-- Ends the head section of the HTML document -->
<body><!-- Contains the content of the HTML document -->
<p>w3resource Tutorial</p><!-- Displays the text 'w3resource Tutorial' within a paragraph element -->
<div id="mydiv">Border right width animatable</div><!-- Displays the text 'Border right width animatable' within a div element with the ID 'mydiv' -->
</body><!-- Ends the body section of the HTML document -->
</html><!-- Ends the HTML document -->


  • The HTML document structure includes essential elements such as html, head, title, style, and body.
  • CSS styling is applied to an element with the ID 'mydiv', setting its width, height, and border properties.
  • An animation named 'mymove' is defined using keyframes, specifying changes to the right border width property at the 50% mark of the animation.
  • The paragraph element <p> displays the text "w3resource Tutorial".
  • A <div> element with the ID 'mydiv' displays the text "Border right width animatable". This text is animated, causing its right border width to change during the animation.

Live Demo:

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

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