"`, "text/html"); probe.innerHTML = "probe"; const frame = document.createElement("iframe"); frame.src = `data:text/html;${encodeURI(doc.documentElement.outerHTML)}`; frame.id = "frame"; target.appendChild(frame); const frame_probe = document.getElementById("frame").contentDocument.getElementById("probe"); probe.innerHTML = "probe"; assert_throws_js(TypeError, _ => { frame_probe.innnerHTML = "probe" }); }, "Regression test for TT changes to parseFromString.");