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<!DOCTYPE html> <html> <head> <title>The title of the document</title> <style> .element { width: 200px; height: 200px; background: #1c87c9; color: #8ebf42; backface-visibility: hidden; -webkit-animation: element 2s infinite linear alternate; animation: element 2s infinite linear alternate; } @-webkit-keyframes element { to { -webkit-transform: rotateY(180deg); } } </style> </head> <body> <h2>An example with hidden value</h2> <div class="element"> <h2>Hello world!</h2> </div> </body> </html>