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

Last update on August 19 2022 21:51:55 (UTC/GMT +8 hours)

Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
<title>How to set the border top-left radius is animatable</title>
<style type="text/css">
#mydiv { 
width: 100px;
height: 150px;
border: 3px solid #FF0000;
padding: 10px 40px;
background: #00CCCC;
-webkit-animation: mymove 5s infinite;
animation: mymove 5s infinite;
}
@keyframes mymove {
50% {border-top-left-radius: 50px;}
}  
</style> 
</head>
<body>
<h1>w3resource Tutorial</h1>
<div id="mydiv">The border-radius property allow to add rounded corners is animatable</div>
</body>
</html>

Live Demo:

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

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HTML-CSS: Tips of the Day

How does the "position: sticky;" property work?

Sticky positioning is a hybrid of relative and fixed positioning. The element is treated as relative positioned until it crosses a specified threshold, at which point it is treated as fixed positioned.

You must specify a threshold with at least one of top, right, bottom, or left for sticky positioning to behave as expected. Otherwise, it will be indistinguishable from relative positioning.

So in your example, you have to define the position where it should stick in the end by using the top property.

HTML Code:

<nav>
  <ul align="left">
    <li><a href="#/contact" class="nav-selections" style="margin-right:35px;">Contact</a></li>
    <li><a href="#/about" class="nav-selections">About</a></li>
    <li><a href="#/products" class="nav-selections">Products</a></li>
    <li><a href="#" class="nav-selections">Home</a></li>
  </ul>
</nav>

CSS Code:

html, body {
  height: 200%;
}

nav {
  position: sticky;
  position: -webkit-sticky;
  top: 0; /* required */
}

.nav-selections {
  text-transform: uppercase;
  letter-spacing: 5px;
  font: 18px "lato", sans-serif;
  display: inline-block;
  text-decoration: none;
  color: white;
  padding: 18px;
  float: right;
  margin-left: 50px;
  transition: 1.5s;
}

.nav-selections:hover {
  transition: 1.5s;
  color: black;
}

ul {
  background-color: #B79b58;
  overflow: auto;
}

li {
  list-style-type: none;
}

Live Demo:

See the Pen html css common editor by w3resource (@w3resource) on CodePen.