[Webkit-unassigned] [Bug 208570] New: frame/iframe scrolling attribute does to recognize value "offscroll" or "off"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208570

            Bug ID: 208570
           Summary: frame/iframe scrolling attribute does to recognize
                    value "offscroll" or "off"
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr

>From https://html.spec.whatwg.org/multipage/rendering.html#the-page:

> If a Document's browsing context is a child browsing context, the container of that browsing context is a frame or iframe element, that element has a scrolling attribute, and that attribute's value is an ASCII case-insensitive match for the string "off", "noscroll", or "no", then the user agent is expected to prevent any scrollbars from being shown for the viewport of the Document's browsing context, regardless of the 'overflow' property that applies to that viewport.

Source/WebCore/html/HTMLFrameElementBase.cpp only handles "no":

ScrollbarMode HTMLFrameElementBase::scrollingMode() const
{
    return equalLettersIgnoringASCIICase(attributeWithoutSynchronization(scrollingAttr), "no")
        ? ScrollbarAlwaysOff : ScrollbarAuto;
}

Gecko recognizes the three values and Chromium added support for them after fixing https://bugs.chromium.org/p/chromium/issues/detail?id=1057454

WPT test was added in https://chromium-review.googlesource.com/c/chromium/src/+/2085396

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