[Webkit-unassigned] [Bug 239687] New: Behavior error when rendering dialog with/without the open attribute

Fri Apr 22 23:08:23 PDT 2022

https://bugs.webkit.org/show_bug.cgi?id=239687

            Bug ID: 239687
           Summary: Behavior error when rendering dialog with/without the
                    open attribute
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tlock.chijin at gmail.com

Created attachment 458203

  --> https://bugs.webkit.org/attachment.cgi?id=458203&action=review

webkit screenshot

The behavior of <dialog> is not expected. As the document (https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog) illustates, when the open attribute is not set, the dialog shouldn't be shown to the user. However, webkit didn't meet this end.

The behavior of Chrome seems correct.

code:

```
<html>
<head>
<style>
</style>
<script>
function jsfuzzer() {
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog
// "When the open attribute is not set, the dialog shouldn't be shown to the user."
document.getElementById("htmlvar00001").setAttribute("open", "true")
}
</script>
</head>
<body onload=jsfuzzer()>
<dialog id="htmlvar00001">dialog 1</dialog>
<dialog id="htmlvar00002">dialog 2</dialog>
</body>
</html
```

link: https://codepen.io/chijinz/pen/QWaPBam

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