Why CSS3 Animation is not working?

You are calling fadein animation in your code but you haven't defined it anywhere.

CSS3 animations are defined with @keyframes rule. More Information about CSS3 animations is Here.

Add following css:

@keyframes fadein {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}


#hero h5 {
  animation: fadein 2s;
  -moz-animation: fadein 2s; /* Firefox */
  -webkit-animation: fadein 2s; /* Safari and Chrome */
  -o-animation: fadein 2s; /* Opera */
  font-weight: strong;
  font-size: 28px; 
}

@keyframes fadein {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<section id="hero">
  <div class="content">
    <div class="container">
      <div class="row">
        <h5>Lorem Ipsum Demo Title</h5>
      </div><!-- row -->
    </div> <!-- container -->
  </div> <!-- content -->
</section><!-- section -->

Tags:

Html

Css

Css Animations

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