animations and transparency code example

Example 1: css transition opacity

/* Answer to: "css transition opacity" */

/*
  CSS transitions allows you to change property values smoothly,
  over a given duration.
*/

.myClass {
  vertical-align: top;
  transition: opacity 0.3s; /* Transition should take 0.3s */
  -webkit-transition: opacity 0.3s; /* Transition should take 0.3s */
  opacity: 1; /* Set opacity to 1 */
}

.myClass:hover {
  opacity: 0.5; /* On hover, set opacity to 2 */
}

/* 
  From `opacity: 1;` to `opacity: 0.5;`, the transition time should
  take 0.3 seconds as soon as the client starts to hover over the
  element.
*/

Example 2: trasition opacity

.fade {
   opacity: 1;
   transition: opacity .25s ease-in-out;
   -moz-transition: opacity .25s ease-in-out;
   -webkit-transition: opacity .25s ease-in-out;
   }

   .fade:hover {
      opacity: 0.5;
      }

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Css Example