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Test Info:

<!doctype html>
<meta charset=utf-8>
<title>Test item blockification of pseudo-elements</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#test {
display: flex;
}
#test::before, #test::after {
content: "test";
display: inline-block;
color: green;
/*
* NOTE(emilio): The transition rule is very intentional, to avoid testing
* the eagerly resolved style.
*/
transition: color 1s ease;
}
</style>
<div id="test"></div>
<script>
test(function() {
document.body.offsetTop;
let test = document.getElementById("test");
assert_equals(getComputedStyle(test, "::before").display, "block");
assert_equals(getComputedStyle(test, "::after").display, "block");
}, "::before and ::after pseudo-elements are blockified");
</script>