File: dynamic-append.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Meta refresh applies even when dynamically appended</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/multipage/semantics.html#pragma-directives">

<div id="log"></div>

<script>
"use strict";
setup({ single_test: true });

const iframe = document.createElement("iframe");
let loadCount = 0;

iframe.onload = () => {
  ++loadCount;
  const iDocument = iframe.contentDocument;

  if (loadCount === 1) {
    iDocument.body.innerHTML = `<meta http-equiv="refresh" content="1; url=foo">`;
  } else if (loadCount === 2) {
    assert_equals(iDocument.body.textContent.trim(), "foo");
    done();
  }
};

iframe.src = "support/ufoo";
document.body.appendChild(iframe);
</script>