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Animate background-blend-mode

A Pen By yoksel

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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML

            
              <div class="demo demo--luminosity demo--trans" data-name="Simple transition"></div>

<div class="demo demo--luminosity demo--before" data-name="With :before"></div>
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CSS

            
              BODY {
  padding-top: 1em;
  text-align: center;
  font: 16px/1.4 Arial, sans-serif;
  }

.demo {
  display: inline-block;
  position: relative;
  width: 300px;
  height: 185px;
  margin: 1.5em .5em 0;
  background: url(https://img-fotki.yandex.ru/get/5307/5091629.65/0_567ab_b8a9692a_L.jpg);
  border-radius: 1em;  
  text-align: left;
  transition: all .5s;
  
  &--before:before {
    content: '';
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: url(https://img-fotki.yandex.ru/get/5307/5091629.65/0_567ab_b8a9692a_L.jpg);
    border-radius: inherit; 
    opacity: 0;
    transition: all .5s;
    }
    
  &:after {
    content: attr(data-name);
    position: absolute;
    top: -1.5em;
    left: .5em;
    }
  }

.demo--luminosity {
  background-color: steelblue;
  background-blend-mode: luminosity;
  }

.demo--trans:hover {
  background-blend-mode: normal;
  }
.demo--before:hover:before {
  opacity: 1;
  }
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JS
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