[Webkit-unassigned] [Bug 62358] New: Needs a unified way to handle a case when a shadow host is focused.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=62358

           Summary: Needs a unified way to handle a case when a shadow
                    host is focused.
           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,
                    tkent at chromium.org, dominicc at chromium.org,
                    morrita at google.com


Let me summarize the current status here:

 * <input type=text> element, and <textarea> element
    - They use a shadow root internally. They have a focusable element, <DIV>, in their shadow root.
    - They do extra works in their focus() method. Due to their extra works, a FocusController should treat them specially.
    - Tab traversal also treats them specially. Tab traversal doesn't look for a focusable element in their shadow root.

 * <kengen> elements, as a representative of usual shadow host elements.
    - <keygen> elements has a focusable 'select' element in the shadow root.
    - <keygen> element doesn't do any extra works in focus() method, so even if we call keygenelement.focus(), a internal 'select' element cannot get focused. Which means we can not change the value by keyboard, <Up> or <Down>.
    - Tab traversal can find a internal <select> element and can focus it. Which means that once we focus it by <Tab> key, we can change the value by keyboard, <UP> or <Down>.

It is nice to get rid of this 'gap'. Let me update this bugzilla entty once I have some ideas to handle this gap nicely.

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