[Webkit-unassigned] [Bug 219536] New: Disabled select options are still selectable when optgroups are used in MobileSafari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219536

            Bug ID: 219536
           Summary: Disabled select options are still selectable when
                    optgroups are used in MobileSafari
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kris at webhare.nl
                CC: cdumez at apple.com, wenson_hsieh at apple.com

MobileSafari doesn't seem to honour the disabled attribute on optgroups, see for example the example at https://developer.mozilla.org/en-US/docs/Web/HTML/Element/optgroup#Examples where the options in the third (disabled) optgroup are enabled in Safari on iOS.

Also, when optgroups are used, disabled options are still selectable, whether they are within an optgroup or outside of it. In the following examples the disabled option is rendered as disabled, but still selectable (and once selected, they are no longer rendered as being disabled):

<select>
  <optgroup label="My group">
    <option>My selectable option</option>
    <option disabled>My disabled option</option>
  </optgroup>
</select>

<select>
  <option>My selectable option</option>
  <option disabled>My disabled option</option>
  <optgroup label="My group" />
</select>

Tested using iOS 14.2 on iPhone 11 Pro and iOS 14.2, 13.7 and 12.4 in the iOS Simulator.

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