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Test Info:

<!DOCTYPE html>
<title>Performance Paint Timing Test: FCP due to pseudo-element getting positive opacity</title>
#main {
position: relative;
width: 100px;
height: 100px;
#main:after {
content: "TEXT";
opacity: 0;
/* contentful class is defined in test_fcp script. */
#main.contentful:after {
opacity: 0.5;
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<div id="main">
test_fcp("First contentful paint fires due to pseudo-element getting positive opacity.")