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<!DOCTYPE html> <html lang="en-US"> <head> <style> div{ width: 200px; height: 200px; border: 10px solid green; animation: myAnimation 5s infinite; -webkit-animation: myAnimation 5s infinite; /* Safari 4.0 - 8.0 */ } @keyframes myAnimation { 50% {border-left-color: red;} } /* Safari 4.0 - 8.0 */ @-webkit-keyframes myAnimation { 50% {border-left-color: red;} } </style> </head> <body> <h1>CSS Animatable border-left-color</h1> <div></div> </body> </html>
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