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chromium/third_party/blink/web_tests/external/wpt/css/css-animations/parsing/animation-valid.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Animations: parsing animation with valid values</title>
<link rel="help" href="https://drafts.csswg.org/css-animations/#propdef-animation">
<meta name="assert" content="animation supports the full grammar '<single-animation> #'.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
</head>
<body>
<script>
// <single-animation> = <time> || <easing-function> || <time> ||
// <single-animation-iteration-count> || <single-animation-direction> ||
// <single-animation-fill-mode> || <single-animation-play-state> ||
// [ none | <keyframes-name> ]
test_valid_value("animation", "1s", ["1s", "1s ease 0s 1 normal none running none"]);
test_valid_value("animation", "cubic-bezier(0, -2, 1, 3)", ["cubic-bezier(0, -2, 1, 3)", "auto cubic-bezier(0, -2, 1, 3) 0s 1 normal none running none"]);
test_valid_value("animation", "cubic-bezier( 0, -2, 1, 3 )", ["cubic-bezier(0, -2, 1, 3)", "auto cubic-bezier(0, -2, 1, 3) 0s 1 normal none running none"]);
test_valid_value("animation", "1s -3s", ["1s -3s", "1s ease -3s 1 normal none running none"]);
test_valid_value("animation", "4", ["4", "auto ease 0s 4 normal none running none"]);
test_valid_value("animation", "reverse", ["reverse", "auto ease 0s 1 reverse none running none"]);
test_valid_value("animation", "both", ["both", "auto ease 0s 1 normal both running none"]);
test_valid_value("animation", "paused", ["paused", "auto ease 0s 1 normal none paused none"]);
test_valid_value("animation", "none", ["auto", "none", "auto ease 0s 1 normal none running none"]);
test_valid_value("animation", "anim", ["anim", "auto ease 0s 1 normal none running anim"]);

test_valid_value("animation", "anim paused both reverse 4 1s -3s cubic-bezier(0, -2, 1, 3)",
  "1s cubic-bezier(0, -2, 1, 3) -3s 4 reverse both paused anim");

test_valid_value("animation", "anim paused both reverse, 4 1s -3s cubic-bezier(0, -2, 1, 3)",
  ["reverse both paused anim, 1s cubic-bezier(0, -2, 1, 3) -3s 4", "auto ease 0s 1 reverse both paused anim, 1s cubic-bezier(0, -2, 1, 3) -3s 4 normal none running none"]);

// TODO: Add test with a single negative time.
// TODO: Add test with a single timing-function keyword.
</script>
</body>
</html>