[Webkit-unassigned] [Bug 226725] New: MouseEvent.constructor misses checking if the param value is non-infinite or not

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226725

            Bug ID: 226725
           Summary: MouseEvent.constructor misses checking if the param
                    value is non-infinite or not
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zyscoder at gmail.com

Steps to reproduce:

(1) Open a tab and navigate to any URL;
(2) Run the following code in the Console of Devtools:
```
new MouseEvent('',{screenX: NaN});
```
(3) This code would be evaluated successfully without any exceptions thrown.

Actual results:

This code would be evaluated successfully without any exceptions thrown.

Expected results:

In Chome, this code would throw an exception: `Uncaught TypeError: Failed to construct 'MouseEvent': The provided double value is non-finite.`.
It seems reasonable to throw such an exception since the type of the screenX param is double.

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