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Applies styles to an element when in fullscreen mode.

<div class="container">
  <p><em>Click the button below to enter the element into fullscreen mode. </em></p>
  <div class="element" id="element"><p>I change color in fullscreen mode!</p></div>
  <br />
  <button onclick="var el = document.getElementById('element'); el.requestFullscreen();">
    Go Full Screen!
.container {
  margin: 40px auto;
  max-width: 700px;

.element {
  padding: 20px;
  height: 300px;
  width: 100%;
  background-color: skyblue;
  box-sizing: border-box;

.element p {
  text-align: center;
  color: white;
  font-size: 3em;

.element:-ms-fullscreen p {
  visibility: visible;

.element:fullscreen {
  background-color: #e4708a;
  width: 100vw;
  height: 100vh;

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