[Webkit-unassigned] [Bug 199708] New: history.back/forward does not trigger the popstate event synchronously

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199708

            Bug ID: 199708
           Summary: history.back/forward does not trigger the popstate
                    event synchronously
           Product: WebKit
           Version: Safari 12
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: History
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: 709922234 at qq.com

Steps to reproduce the problem:
1. open https://www.google.com
2. open webconsole
3. input 
```
  history.pushState("/", {}, "");
  let flag = false;
  window.addEventListener("popstate", () => {
    console.log({ flag });
  });
  flag = true;
  history.back();
  queueMicrotask(() => (flag = false));
```

What is the expected behavior?
output `{ flag: true }`

What went wrong?
output `{ flag: false }`

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