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Test Info:

<!doctype html>
<meta charset=utf-8>
<title>Multiple from and to keyframes</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<style>
@keyframes multiple-from-to-keyframes {
from, to { animation-timing-function: cubic-bezier(0, 0, 1, 1) }
from { left: 50px }
to { left: 150px }
}
</style>
<div id="log"></div>
<script>
'use strict';
test(t => {
const div = addDiv(t);
div.style.animation = 'multiple-from-to-keyframes 100s -50s linear';
assert_equals(getComputedStyle(div).left, "100px");
}, 'Animations should not use an implicit value when the first rule within a @keyframes rule specifies "from" and "to" but only specifies a timing function.');
</script>