iframe-loading-lazy-adopt-lazy-iframe-from-script-disabled-document.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-adopt-lazy-iframe-from-script-disabled-document.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

  <title>Test lazy loading iframe remains lazy loading originally created

         in a script-disabled document, then got adopted to a regular document</title>

  <script src="/resources/testharness.js"></script>

  <script src="/resources/testharnessreport.js"></script>

</head>

<script>

  const t = async_test("Test lazy loading iframe remains lazy loading originally created" +

                       "in a script-disabled document, then got adopted to a regular document");

  const lazyIFrameInScriptDisabledDocumentOnLoad =

    t.unreached_func("lazy loading iframe shoudn't be loaded because it's not visible");

  window.addEventListener("load", t.step_func(() => {

    const parser = new DOMParser();

    const remoteDoc = `

        <!DOCTYPE html>

        <html>

          <iframe

            id="lazyIFrameInScriptDisabledDocument"

            src="resources/subframe.html"

            loading="lazy"

            width="600"

            height="400"

            style="display: none"

          Your browser does not support iframes.

          </iframe>

        </html>`;

    const htmlDoc = parser.parseFromString(remoteDoc, "text/html");

    var newIframe = htmlDoc.getElementById("lazyIFrameInScriptDisabledDocument");

    newIframe.onload = lazyIFrameInScriptDisabledDocumentOnLoad;

    document.body.appendChild(newIframe);

    // Give some time to the "load" event to fire.

    t.step_timeout(t.step_func_done(), 2000);

  }));

</script>

</html>