[Webkit-unassigned] [Bug 192587] New: stepUp/stepDown throw InvalidStateError when number input is empty

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192587

            Bug ID: 192587
           Summary: stepUp/stepDown throw InvalidStateError when number
                    input is empty
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: feliziani.emanuele at gmail.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Overview: When an input type=number field is empty, calling stepUp or stepDown on it throws InvalidStateError. Other browsers assume the empty value as 0 and act accordingly.

Steps to Reproduce:

1) Open this test page with only the input field and a button to trigger stepUp: https://7zyy3zrq21.codesandbox.io/ (you can access the editor page for quick tweaking here: https://codesandbox.io/s/7zyy3zrq21)
2) Click on the button

Actual Result: The input field throws InvalidStateError and the value is not changed

Expected Result: The value should be set to 0.01 (assume 0 + step). If a min attribute is set, the value should be set equal to the min attribute. The described behaviour is what happens by clicking on the native UI controls of the input type=number or by using the up/down arrows. 

Additional Information: The expected result is present in both Chrome and Firefox.

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