<iframe id="test-iframe"></iframe>
<script src="../include.js"></script>
<script>
    asyncTest((done) => {
        window.addEventListener("message", (e) => {
            println(e.data);
            if (e.data === "DONE")
                done();
        });

        let testCount = 1;

        function createTest(asBlob, final = false) {
            let html = `
                &lt;script&gt;
                    parent.postMessage(${testCount++}, "*");
                    ${final ? "parent.postMessage('DONE', '*')" : ""}
                &lt;/script&gt;
            `;
            html = html.replaceAll("&lt;", "<").replaceAll("&gt;", ">");
            return asBlob
            ? URL.createObjectURL(new Blob([html], { type: "text/html" }))
            : html;
        }

        // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element:process-the-iframe-attributes-2
        // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element:process-the-iframe-attributes-3
        // Whenever an iframe element with a non-null content navigable has its srcdoc attribute set, changed, or removed,
        // the user agent must process the iframe attributes.
        // Similarly, whenever an iframe element with a non-null content navigable but with no srcdoc attribute specified
        // has its src attribute set, changed, or removed, the user agent must process the iframe attributes.

        const firstSrcdoc = createTest(false);
        const testIframe = document.getElementById("test-iframe");

        testIframe.addEventListener("load", () => {
           switch (testCount)
           {
               case 2:
                   // Change srcdoc.
                   testIframe.srcdoc = createTest(false);
                   break;
               case 3:
                   // Remove srcdoc.
                   testIframe.removeAttribute("srcdoc");
                   testCount++;

                   // FIXME: Do this in test case 4. However, it does not work currently as the navigation to
                   //        about:blank following srcdoc does not fire a load event.
                   // Set src.
                   testIframe.src = createTest(true);
                   break;
               case 5:
                   // Change src.
                   testIframe.src = createTest(true);
                   break;
               case 6:
                   // srcdoc takes priority.
                   testIframe.srcdoc = createTest(false);
                   break;
               case 7:
                   // Changing src has no effect when srcdoc is specified.
                   testIframe.src = createTest(true);
                   setTimeout(() => {
                       testIframe.srcdoc = createTest(false);
                   }, 0)
                   break;
               case 9:
                   // Removing src has no effect when srcdoc is specified.
                   testIframe.removeAttribute("src");
                   setTimeout(() => {
                       testIframe.srcdoc = createTest(false);
                   }, 0);
                   break;
               case 10:
                   // Setting src has no effect when srcdoc is specified.
                   testIframe.src = createTest(true);
                   setTimeout(() => {
                       testIframe.srcdoc = createTest(false);
                   }, 0);
                   break;
               case 12:
                   // Changing any other attributes doesn't cause a reload.
                   testIframe.setAttribute("data-hello", "world");
                   setTimeout(() => {
                       testIframe.srcdoc = createTest(false, true);
                   }, 0);
                   break;
               default:
                   break;
           }
        });

        // Set srcdoc.
        testIframe.srcdoc = firstSrcdoc;
    });
</script>