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chromium/third_party/blink/web_tests/animations/animations-csstext.html 

<!doctype html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>
test(function(){
    var div = document.createElement('div');
    div.style.animationName = 'anim';
    assert_equals(div.style.cssText, 'animation-name: anim;');
    div.style.animationName = "\\ ";
    assert_equals(div.style.cssText, 'animation-name: \\ ;');
    div.style.animation = 'hello 2s';
    assert_equals(div.style.cssText, 'animation: 2s ease 0s 1 normal none running hello;');
}, 'cssText serializes animation properties sanely');
</script>