243488 2022-08-03 01:41:50 -0700 Why I create an iframe, but it affected promise microtasks in webkit 2022-08-05 17:40:22 -0700 1 1 1 Unclassified WebKit JavaScriptCore Safari 13 All All RESOLVED DUPLICATE 235322 https://codesandbox.io/s/compassionate-volhard-86pz0b?file=/index.html;https://86pz0b.csb.app/ P1 Blocker --- 1 993634344 webkit-unassigned cdumez rniwa oldest_to_newest 1888592 0 993634344 2022-08-03 01:41:50 -0700 I find an unexpected result when I created an iframe in my code, but it affected promise microtasks in webkit.eg: safari，iosApp webview. code: Promise.resolve(1).then(data => { console.log('>>>data') }) var node = document.createElement('iframe') node.style.display = 'none' node.src = 'www.baidu.com'; (document.body || document.documentElement).appendChild(node) console.log('>>>end') It‘s normal output is： >>>end >>>data But it‘s output in webkit is： >>>data >>>end 1889295 1 rniwa 2022-08-05 17:40:22 -0700 *** This bug has been marked as a duplicate of bug 235322 ***