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HTML-CSS: Pulse loader

HTML-CSS : Exercise-12 with Solution

Using HTML, CSS create a pulse effect loader animation using the animation-delay property.

  • Use @keyframes to define an animation at two points in the cycle. At the start (0%), the two <div> elements have no width or height and are positioned at the center. At the end (100%), both <div> elements have increased width and height, but their position is reset to 0.
  • Use opacity to transition from 1 to 0 when animating to give the <div> elements a disappearing effect as they expand.
  • Set a predefined width and height for the parent container, .ripple-loader and use position: relative to position its children.
  • Use animation-delay on the second <div> element, so that each element starts its animation at a different time.

HTML Code:

<!--License: https://bit.ly/3GjrtVF-->
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Using HTML, CSS create a pulse effect loader animation using the animation-delay property</title>
</head>
<body>
<strong>Preview:</strong><br>
<div class="ripple-loader">
  <div>w3r</div>
  <div>w3r</div>
</div>
</body>
</html>

CSS Code:

<style> 

.ripple-loader {
  position: relative;
  width: 64px;
  height: 64px;
}

.ripple-loader div {
  position: absolute;
  border: 4px solid #AA4A44;
  border-radius: 50%;
  animation: ripple-loader 1s ease-out infinite;
}

.ripple-loader div:nth-child(2) {
  animation-delay: -0.5s;
}

@keyframes ripple-loader {
  0% {
    top: 32px;
    left: 32px;
    width: 0;
    height: 0;
    opacity: 1;
  }
  100% {
    top: 0;
    left: 0;
    width: 64px;
    height: 64px;
    opacity: 0;
  }
}

</style>

HTML-CSS Editor:

See the Pen html-css-practical-exercises by w3resource (@w3resource) on CodePen.


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HTML-CSS: Tips of the Day

Two divs side by side - Fluid display

#sides{
margin:0;
}
#left{
float:left;
width:75%;
overflow:hidden;
}
#right{
float:left;
width:25%;
overflow:hidden;
}

Ref: https://bit.ly/3EN8QKy