CSS Properties: How to set the border top-left radius is animatable?

Last update on February 19 2024 13:01:51 (UTC/GMT +8 hours)

Solution:

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 top-left radius is 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: 100px; /* Sets the width of the element to 100 pixels */
height: 150px; /* Sets the height of the element to 150 pixels */
border: 3px solid #FF0000; /* Sets a 3-pixel solid border with the color #FF0000 */
padding: 10px 40px; /* Sets the padding inside the element to 10 pixels on the top and bottom, and 40 pixels on the left and right */
background: #00CCCC; /* Sets the background color of the element to #00CCCC */
-webkit-animation: mymove 5s infinite; /* Specifies a WebKit-specific animation named 'mymove' to run infinitely for 5 seconds */
animation: mymove 5s infinite; /* Specifies an animation named 'mymove' to run infinitely for 5 seconds */
}
@keyframes mymove { /* Defines a keyframe animation named 'mymove' */
50% {border-top-left-radius: 50px;} /* At 50% of the animation duration, sets the border-top-left-radius property to 50 pixels, creating rounded corners */
}  
</style><!-- Ends the CSS style block -->
</head><!-- Ends the head section of the HTML document -->
<body><!-- Contains the content of the HTML document -->
<h1>w3resource Tutorial</h1><!-- Displays the text 'w3resource Tutorial' within an h1 element -->
<div id="mydiv">The border-radius property allows adding rounded corners and is animatable</div><!-- Displays a div element with text and rounded corners on the top-left corner that animates during the specified keyframe animation -->
</body><!-- Ends the body section of the HTML document -->
</html><!-- Ends the HTML document -->

Explanation:

The HTML document structure includes essential elements such as html, head, title, style, and body.
A CSS rule is defined for an element with the ID mydiv, specifying its width, height, border, padding, background color, and animation properties.
An animation named mymove is defined using keyframes, which changes the border-top-left-radius property to 50 pixels at the 50% mark of the animation.
The text "w3resource Tutorial" is displayed within an h1 element.
A div element with text and rounded corners on the top-left corner, which animates during the specified keyframe animation, is displayed.
No comments were added below the code line as requested.

Live Demo:

See the Pen border-top-left-radius-animatable-answer by w3resource (@w3resource) on CodePen.

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