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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Computed visibility in nominal case</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#hiddenDiv {
visibility: hidden;
}
/* This rule is important because add rule on the div */
* {
margin-bottom: 10px;
}
</style>
<body>
<div id="hiddenDiv">Hello, Ronron!</div>
</body>
<script>
"use strict";
test(() => {
const element = document.querySelector("body");
assert_equals(getComputedStyle(element).visibility, "visible");
}, "Sanity check: getComputedStyle returns apparent visibility");
test(() => {
const element = document.querySelector("#hiddenDiv");
assert_equals(getComputedStyle(element).visibility, "hidden");
}, "Real check: getComputedStyle returns hidden visibility");
</script>