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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Inheritance replaces existing value of counter properties</title>
<meta name="assert" content="Inheritance replaces existing value of counter properties.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#container {
counter-reset: first 1;
counter-increment: second 2;
counter-set: third 3;
}
.target {
counter-reset: fourth 4;
counter-increment: fifth 5;
counter-set: sixth 6;
}
</style>
</head>
<body>
<div id="container">
<div id="target"></div>
</div>
<script>
'use strict';
const container = document.getElementById('container');
// 'counter-set' can be added.
for (let property of ['counter-reset', 'counter-increment']) {
test(() => {
const target = document.createElement('div');
target.classList += 'target';
container.appendChild(target);
target.style[property] = 'inherit';
assert_equals(getComputedStyle(target)[property], getComputedStyle(container)[property]);
}, 'Inheritance of ' + property + ' replaces existing value');
}
</script>
</body>
</html>