[Webkit-unassigned] [Bug 242063] New: Resetting the value of an input file to null should make it invalid

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242063

            Bug ID: 242063
           Summary: Resetting the value of an input file to null should
                    make it invalid
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 12
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: felipe at fluente.me

I'm trying to select an input[type="file"]:invalid but it doesn't work on Safari. 

That's because Safari doesn't mark it as invalid when this FormElement value is reset to "" or null.

Isolated preview: https://codepen.io/FelipePS/pen/OJvJmoK

How to reproduce error:
1) On load, input is invalid (background-color light blue) because it's empty and required.
2) Add a file to it. It changes to valid as expected, assuming background-color light grey.
3) Click "Remove file" to reset the input.

Expected behaviour: Upon clicking "Remove file", it should assume background-color light blue again, because it's now empty and it's a required field. Chrome 102 and Firefox 100 behave as expected.

Current behaviour: Safari maintains the input field as valid (background-color light grey).

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