[Webkit-unassigned] [Bug 64160] New: Foward a non-bubbling event to related shadow host elements across relevant shadow scopes.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64160

           Summary: Foward a non-bubbling event to related shadow host
                    elements across relevant shadow scopes.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hayato at chromium.org
                CC: dglazkov at chromium.org, rolandsteiner at chromium.org,
                    dominicc at chromium.org, morrita at google.com
            Blocks: 59805


Let me explain using the following example:

Document
  Component-A
    Component-B
      Component-C
      Component-D
        Input-E (* new-focused-node)
    Component-F
      Input-G
      Component-H
        Input-I
      Component-J
        Input-K (* old-focused-node)

'Component' here means a focusable shadow host element.
Suppose that a focused node has just been changed from 'Input-K' to 'Input-E'. 

In this case, which components should receive a 'focus' event? Remember that a 'focus' event is a non-bubbling event.

It seems that XBL2 spec says a boundary element should receive a 'focus' event if a focusable element underneath get focused.
- http://dev.w3.org/2006/xbl2/#the-focus-domfocusin-blur-and-domfocusou

My initial rough idea is:

 * B and D (and Input-E) should receive a 'focus' event.
 * F and J (and Input-K) should receive a 'blur' event.
 * Each event should be fired as in a Event Target phase, which means:
   - event.target is always same to the element itself.
     e.g. A focus event listener on Component B will receive a event whose target is set to 'Component-B'.
   - event.stopPropagation() doesn't take an effect. That doesn't make sense.

Although I use a 'focus' event as an example, I guess we can apply the same discussion to all non-bubbling events.
Any opinion are welcome.


I referred to these documents.
- http://dev.w3.org/2006/xbl2/#event-handlers
- http://wiki.whatwg.org/wiki/Component_Model_Use_Cases#Focus_and_Shadow_Subtrees
- http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-eventgroupings-htmlevents

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