for (const [ev, target] of [ ["beforeunload", iframe => iframe.contentWindow], ["pagehide", iframe => iframe.contentWindow], ["unload", iframe => iframe.contentWindow], ["visibilitychange", iframe => iframe.contentDocument], ]) { async_test(t => { const iframe = document.body.appendChild(document.createElement("iframe")); t.add_cleanup(() => iframe.remove()); iframe.src = "/common/blank.html"; iframe.onload = t.step_func(() => { target(iframe).addEventListener(ev, t.step_func_done(() => { assert_not_equals(iframe.contentDocument.childNodes.length, 0); assert_equals(iframe.contentDocument.open(), iframe.contentDocument); assert_not_equals(iframe.contentDocument.childNodes.length, 0); })); iframe.src = "about:blank"; }); }, `document.open should bail out when ignore-opens-during-unload is greater than 0 during ${ev} event (in top-level browsing context)`); async_test(t => { const iframe = document.body.appendChild(document.createElement("iframe")); t.add_cleanup(() => iframe.remove()); iframe.src = "/common/blank.html?1"; iframe.onload = t.step_func(() => { const doc = iframe.contentDocument; const innerIframe = doc.body.appendChild(doc.createElement("iframe")); innerIframe.src = "/common/blank.html?2"; innerIframe.onload = t.step_func(() => { // Navigate the parent, listen on the child, and open() the parent. target(innerIframe).addEventListener(ev, t.step_func_done(() => { assert_not_equals(iframe.contentDocument.childNodes.length, 0); iframe.contentDocument.open(); assert_not_equals(iframe.contentDocument.childNodes.length, 0); })); iframe.src = "about:blank"; }); }); }, `document.open should bail out when ignore-opens-during-unload is greater than 0 during ${ev} event (open(parent) while unloading parent and child)`); async_test(t => { const iframe = document.body.appendChild(document.createElement("iframe")); t.add_cleanup(() => iframe.remove()); iframe.src = "/common/blank.html?1"; iframe.onload = t.step_func(() => { const doc = iframe.contentDocument; const innerIframe = doc.body.appendChild(doc.createElement("iframe")); innerIframe.src = "/common/blank.html?2"; innerIframe.onload = t.step_func(() => { // Navigate the child, listen on the child, and open() the parent. target(innerIframe).addEventListener(ev, t.step_func_done(() => { assert_not_equals(iframe.contentDocument.childNodes.length, 0); iframe.contentDocument.open(); assert_equals(iframe.contentDocument.childNodes.length, 0); })); innerIframe.src = "about:blank"; }); }); }, `document.open should bail out when ignore-opens-during-unload is greater than 0 during ${ev} event (open(parent) while unloading child only)`); }