no-manifest-from-iframe-manual.html

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<!DOCTYPE html>

<title>

  Don't install manifests that are not top-level from browsing contexts

</title>

<link rel="help" href="https://html.spec.whatwg.org/#link-type-manifest" />

<h1>Don't install manifests that are not top-level from browsing contexts</h1>

<p>

  To pass, the user agent must not use the manifest in iframe. The user agent

  must behave as if there is no manifest present.

</p>

<script>

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

  iframe.srcdoc = "<h1>hi</h1>";

  document.body.append(iframe);

  iframe.onload = () => {

    const link = iframe.contentDocument.createElement("link");

    link.rel = "manifest";

    link.href = "/appmanifest/name-member/name-member-fail.webmanifest";

    iframe.contentDocument.head.append(link);

};

</script>