[Webkit-unassigned] [Bug 207981] New: input type='number' with maxlength attribute is ignored

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207981

            Bug ID: 207981
           Summary: input type='number' with maxlength attribute is
                    ignored
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: karl+webkit at la-grange.net
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Created attachment 391234

  --> https://bugs.webkit.org/attachment.cgi?id=391234&action=review

test case for input/number and maxlength

Steps to reproduce the problem:
1. Open the test case
2. Type 123 in the input form

What is the expected behavior?
12 is displayed

What went wrong?
123 is displayed

Did this work before? N/A 

Does this work in other browsers? N/A

Safari version: Release 100 (Safari 13.2, WebKit 15610.1.2.1))  Channel: Tech Preview
OS Version: OS X 10.15
Flash Version: 

What is the spec saying https://html.spec.whatwg.org/multipage/input.html#attr-input-maxlength

> The maxlength attribute, when it applies, is a form control maxlength attribute.

Following https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#attr-fe-maxlength

> Constraint validation: If an element has a maximum allowed value length, its dirty value flag is true, its value was last changed by a user edit (as opposed to a change made by a script), and the JavaScript string length of the element's API value is greater than the element's maximum allowed value length, then the element is suffering from being too long.
> 
> User agents may prevent the user from causing the element's API value to be set to a value whose JavaScript string length is greater than the element's maximum allowed value length.

It doesn't seem a hard constraint, but

## results for type='number'

1. enter into the url bar
```
data:text/html,<input type='number' maxlength='2'/>
```
2. type 123

Results in different browsers
* firefox: 12  (75.0a1 (2020-02-18) (64-bit))
* chrome: 123 (Version 82.0.4062.4 (Build officiel) canary (64 bits))
* safari: 123 (Release 100 (Safari 13.2, WebKit 15610.1.2.1))

## results for type='text'

```
data:text/html,<input type='text' maxlength='2'/>
```
Results in different browsers
* firefox: 12  (75.0a1 (2020-02-18) (64-bit))
* chrome: 12 (Version 82.0.4062.4 (Build officiel) canary (64 bits))
* safari: 12 (Release 100 (Safari 13.2, WebKit 15610.1.2.1))

This was originally filed as a bug on mozilla bugzilla
https://bugzilla.mozilla.org/show_bug.cgi?id=1616620

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