[Webkit-unassigned] [Bug 226434] New: window.scroll(null) throws an exception

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226434

            Bug ID: 226434
           Summary: window.scroll(null) throws an exception
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zyscoder at gmail.com
                CC: bugs-noreply at webkitgtk.org

Steps to reproduce:

(1) Open a tab and navigate to https://www.icann.org/;
(2) Run the following code in the Console of Devtools:
```
window.scrollTo(null);
```
(3) Then this code would throw an exception.

Actual results:

This code would throw an exception: `TypeError: null is not an object (evaluating 'arguments[0].left')`

Expected results:

As https://drafts.csswg.org/cssom-view/#dom-window-scroll says, 
```
If invoked with one argument, follow these substeps:
  - Let options be the argument.
  - Let x/y be the value of the left/top dictionary member of options, if present, or the viewport’s current scroll position on the x/y axis otherwise.
```

It seems reasonable to let x/y be the value of the viewport’s current scroll position on the x/y axis and no need to throw any exceptions for this code.

In my test, Chrome and Firefox would not throw any exceptions when evaluating this code.

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