allow-scripts-flag-changing-1.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-1.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Meta refresh is blocked by the allow-scripts sandbox flag at its creation time, not when refresh comes due</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#attr-meta-http-equiv-refresh">

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

<script>

"use strict";

setup({ single_test: true });

const sourceIFrame = document.createElement("iframe");

sourceIFrame.setAttribute("sandbox", "allow-same-origin");

const destIFrame = document.createElement("iframe");

let sourceLoadCount = 0;

let destLoadCount = 0;

sourceIFrame.onload = () => {

  ++sourceLoadCount;

  if (sourceLoadCount === 2) {

    assert_unreached("The iframe from which the meta came from must not refresh");

  maybeStartTest();

};

destIFrame.onload = () => {

  ++destLoadCount;

  if (destLoadCount === 2) {

    // destIFrame doesn't have the sandboxed automatic features browsing context

    // flag sets, thus navigated.

    assert_equals(destIFrame.contentDocument.body.textContent.trim(), "foo");

    done();

  maybeStartTest();

};

function maybeStartTest() {

  if (sourceLoadCount === 1 && destLoadCount === 1) {

    const meta = sourceIFrame.contentDocument.querySelector("meta");

    destIFrame.contentDocument.body.appendChild(meta);

sourceIFrame.src = "support/refresh.sub.html?input=" + encodeURIComponent("1; url=foo");

destIFrame.src = "support/ufoo";

document.body.appendChild(sourceIFrame);

document.body.appendChild(destIFrame);

</script>