[Webkit-unassigned] [Bug 190626] New: [Datalist] imported/w3c/web-platform-tests/html/semantics/forms/the-datalist-element/datalistoptions.html fails after enabling the datalist element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190626

            Bug ID: 190626
           Summary: [Datalist]
                    imported/w3c/web-platform-tests/html/semantics/forms/t
                    he-datalist-element/datalistoptions.html fails after
                    enabling the datalist element
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

See: GenericCachedHTMLCollection.cpp:

GenericCachedHTMLCollection<traversalType>::elementMatches handles DataListOptions by filtering out disabled and empty option elements, which means HTMLDataListElement.options() won't include disabled or empty options. However, this WPT checks that HTMLDataListElement.options() does include empty and disabled options.

The official spec has this to say:

<https://www.w3.org/TR/html52/sec-forms.html#the-datalist-element>

> Each option element that is a descendant of the datalist element, that is not disabled, and whose value is a string that isn’t the empty string, represents a suggestion. Each suggestion has a value and a label.
> 
> datalist . options
> 
> Returns an HTMLCollection of the option elements of the datalist element.
> The options IDL attribute must return an HTMLCollection rooted at the datalist node, whose filter matches option elements.

So the spec makes it clear what a suggestion is w.r.t. the datalist element, but it never specifies that there's a 1-1 mapping between a datalist element's options and its suggestions...

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