[Webkit-unassigned] [Bug 220675] New: AX: AT-synthesized key events for common user actions (increment/decrement) are detectably different in many ways, potentially causing both web app breakage and AT identification

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220675

            Bug ID: 220675
           Summary: AX: AT-synthesized key events for common user actions
                    (increment/decrement) are detectably different in many
                    ways, potentially causing both web app breakage and AT
                    identification
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jcraig at apple.com
                CC: webkit-bug-importer at group.apple.com

Follow-on from bug 220626.

AT-synthesized key events for common user actions (increment/decrement) are detectably different in many ways, potentially causing both web app breakage and AT identification

https://github.com/WICG/aom/blob/gh-pages/explainer.md#deprecated-keyboardevent-object-properties-optional

The synthetic events should include all the other key event properties listed in that table for two reasons.

1. Someone else is going to write an example that works with the keyboard but doesn't work with VO because it uses another one of the legacy properties. `event.which` for example. It's 0 with this patch, but should be 40 for ArrowDown... keyIdentifier also uses a different case between the AT and non-AT path: "up" vs "Up"

2. Any difference in the Event object might be used nefariously to differentiate an AT user from a keyboard user. For example: event.code, event.keyLocation and event.metaKey are also different between the AT and non-AT paths, but should not be. There may be more.

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