[Webkit-unassigned] [Bug 199485] New: Single selection <select> with <optgroups> shows multiple selected options

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199485

            Bug ID: 199485
           Summary: Single selection <select> with <optgroups> shows
                    multiple selected options
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joaope at gmail.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Created attachment 373443

  --> https://bugs.webkit.org/attachment.cgi?id=373443&action=review

Multiple selected option on a single-selection <select>

For a <select> using <optgroup>'s and without multiple option, user is able to select multiple items. Reproduced on an iPhone 12.3.1 but I can see the same behaviour in previous versions.

How to reproduce:
1. Go to https://developer.mozilla.org/en-US/docs/Web/HTML/Element/optgroup#Example (or any other website with select/optgroup)
2. Select first option
3. Scroll all the way down to the last option
4. Select last option

Both options are now selected.

The trick to reproduce seems to be scrolling enough to hide the current selection from the screen and then select another option.

It seems a visual bug as JavaScript correctly indicates the current selection. Also using JavaScript to un-select all options but the current one doesn't seem to work (as a workaround).

Screenshot in attachment.

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