[Webkit-unassigned] [Bug 119291] New: HTMLOptionElement::defaultSelected should affect selection state of other option elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119291

           Summary: HTMLOptionElement::defaultSelected should affect
                    selection state of other option elements
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Forms
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: ap at webkit.org, tkent at chromium.org, jonlee at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/e8f0337fdc86554b48cf81d7ed8c286f251d2405

According to the standard, we should set selectedness to true if defaultSelected
is set to true, and we should not set selectedness to false if defaultSelected
is set to false because the standard says nothing about it.

[1]
> Whenever an option element's selected attribute is added, its selectedness
> must be set to true.

When the selectedness of an option is udpated, other options's selectedness
should become false.

[2]
> If the multiple attribute is absent, whenever an option element in the select
> element's list of options has its selectedness set to true, and whenever an
> option element with its selectedness set to true is added to the select
> element's list of options, the user agent must set the selectedness of all the
> other option elements in its list of options to false.

The old behavior doesn't match to the standard and any other browsers.
The new behavior matches to IE10 and the standard.

We need to update pseudoclass-update-checked-option.html because the
expected behavior of the test was incorrect.

[1] http://www.whatwg.org/specs/web-apps/current-work/multipage/the-button-element.html#attr-option-selected
[2] http://www.whatwg.org/specs/web-apps/current-work/multipage/the-button-element.html#the-select-element

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