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+---
+title: Pulse loader
+tags: animation
+---
+
+Creates a pulse effect loader animation using `animation-delay` property.
+
+```html
+<div class="ripple-loader">
+    <div></div>
+    <div></div>
+</div>
+```
+
+```css
+    .ripple-loader {
+        position: relative;
+        width: 64px;
+        height: 64px;
+    }
+    .ripple-loader div {
+        position: absolute;
+        border: 4px solid #76ff03;
+        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;
+        }
+    }
+```
+
+
+#### Explanation
+
+Note: `1rem` is usually `16px`.
+
+1. `@keyframes` defines an animation at two points in the cycle, Start(0%), where the `div`s neither have width nor height and are positioned at the center & End(100%), where the `div`s have increased `height` & `width` but `position` is reset to 0.
+2. The `div`s seem to disappear as they expand. This is achieved using `opacity` property, which transitions from 1 to 0 in the animation.
+3. `.ripple-loader` is the parent container of the ripples and has a definite width and height. It uses `position: relative` to position child divs.
+4. `.ripple > div`, targets the two child `div`s of the parent to be styled. The `div`s are given a border of `4px` & `border-radius: 50%` to turn them from squares to circles.
+5. `animation` is a shorthand property for the various animation properties: `animation-name`, `animation-duration`, `animation-direction`, `animation-iteration-count` are used. 
+6. `nth-child(n)` targets the element which is the nth child of its parent.
+7. `animation-delay` is used on the second `div`, so that each element does not start the animation at the same time.
+
+#### Browser support
+
+- https://caniuse.com/#feat=css-animation
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