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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Data URI parsing of fragments</title>
<link rel="help" href="">
<meta name="assert" content="Fragments should not be included as part of a data URI's body">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="iframe"></iframe>
const IFRAME_DATA_SRC = `data:text/html,
<style>:target { color: green; }<\/style>
<script>window.addEventListener('load', function() {
const data = {
foo_matches_target_selector: document.getElementById('foo').matches(':target'),
body_html: document.body.innerHTML,
parent.postMessage(data, '*');
<p id="foo">This should be the only visible text.</p>#foo`.replace('\n', '');
async_test(function(t) {
window.addEventListener("message", t.step_func_done(function(event) {
'<p id="foo">This should be the only visible text.</p>');
const iframe = document.getElementById("iframe");
iframe.src = IFRAME_DATA_SRC;