[Webkit-unassigned] [Bug 243488] New: Why I create an iframe, but it affected promise microtasks in webkit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243488

            Bug ID: 243488
           Summary: Why I create an iframe, but it affected promise
                    microtasks in webkit
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: 993634344 at qq.com

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

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