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diff --git a/Source/WebCore/css/SelectorCheckerTestFunctions.h b/Source/WebCore/css/SelectorCheckerTestFunctions.h
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+/*
+ * Copyright (C) 2014-2016 Apple Inc. All rights reserved.
+ * Copyright (C) 2014 Dhi Aurrahman <diorahman@rockybars.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "FocusController.h"
+#include "HTMLInputElement.h"
+#include "HTMLOptionElement.h"
+#include "RenderScrollbar.h"
+#include "ScrollableArea.h"
+#include "ScrollbarTheme.h"
+#include <wtf/Compiler.h>
+
+#if ENABLE(VIDEO_TRACK)
+#include "WebVTTElement.h"
+#endif
+
+namespace WebCore {
+
+ALWAYS_INLINE bool isAutofilled(const Element& element)
+{
+    return is<HTMLInputElement>(element) && downcast<HTMLInputElement>(element).isAutoFilled();
+}
+
+ALWAYS_INLINE bool matchesDefaultPseudoClass(const Element& element)
+{
+    return element.matchesDefaultPseudoClass();
+}
+
+// https://html.spec.whatwg.org/multipage/scripting.html#selector-disabled
+ALWAYS_INLINE bool matchesDisabledPseudoClass(const Element& element)
+{
+    return is<HTMLElement>(element) && downcast<HTMLElement>(element).isActuallyDisabled();
+}
+
+// https://html.spec.whatwg.org/multipage/scripting.html#selector-enabled
+ALWAYS_INLINE bool matchesEnabledPseudoClass(const Element& element)
+{
+    return is<HTMLElement>(element) && downcast<HTMLElement>(element).canBeActuallyDisabled() && !element.isDisabledFormControl();
+}
+
+ALWAYS_INLINE bool isDefinedElement(const Element& element)
+{
+    return !element.isUndefinedCustomElement();
+}
+
+ALWAYS_INLINE bool isMediaDocument(const Element& element)
+{
+    return element.document().isMediaDocument();
+}
+
+ALWAYS_INLINE bool isChecked(const Element& element)
+{
+    // Even though WinIE allows checked and indeterminate to co-exist, the CSS selector spec says that
+    // you can't be both checked and indeterminate. We will behave like WinIE behind the scenes and just
+    // obey the CSS spec here in the test for matching the pseudo.
+    if (is<HTMLInputElement>(element)) {
+        auto& inputElement = downcast<HTMLInputElement>(element);
+        return inputElement.shouldAppearChecked() && !inputElement.shouldAppearIndeterminate();
+    }
+    if (is<HTMLOptionElement>(element))
+        return const_cast<HTMLOptionElement&>(downcast<HTMLOptionElement>(element)).selected();
+
+    return false;
+}
+
+ALWAYS_INLINE bool isInRange(const Element& element)
+{
+    return element.isInRange();
+}
+
+ALWAYS_INLINE bool isOutOfRange(const Element& element)
+{
+    return element.isOutOfRange();
+}
+
+ALWAYS_INLINE bool isInvalid(const Element& element)
+{
+    return element.matchesInvalidPseudoClass();
+}
+
+ALWAYS_INLINE bool isOptionalFormControl(const Element& element)
+{
+    return element.isOptionalFormControl();
+}
+
+ALWAYS_INLINE bool isRequiredFormControl(const Element& element)
+{
+    return element.isRequiredFormControl();
+}
+
+ALWAYS_INLINE bool isValid(const Element& element)
+{
+    return element.matchesValidPseudoClass();
+}
+
+ALWAYS_INLINE bool isWindowInactive(const Element& element)
+{
+    auto* page = element.document().page();
+    if (!page)
+        return false;
+    return !page->focusController().isActive();
+}
+
+ALWAYS_INLINE bool containslanguageSubtagMatchingRange(StringView language, StringView range, unsigned languageLength, unsigned& position)
+{
+    unsigned languageSubtagsStartIndex = position;
+    unsigned languageSubtagsEndIndex = languageLength;
+    bool isAsteriskRange = range == "*";
+    do {
+        if (languageSubtagsStartIndex > 0)
+            languageSubtagsStartIndex += 1;
+        
+        languageSubtagsEndIndex = std::min<unsigned>(language.find('-', languageSubtagsStartIndex), languageLength);
+
+        if (languageSubtagsStartIndex > languageSubtagsEndIndex)
+            return false;
+
+        StringView languageSubtag = language.substring(languageSubtagsStartIndex, languageSubtagsEndIndex - languageSubtagsStartIndex);
+        bool isEqual = equalIgnoringASCIICase(range, languageSubtag);
+        if (!isAsteriskRange) {
+            if ((!isEqual && !languageSubtagsStartIndex) || (languageSubtag.length() == 1 && languageSubtagsStartIndex > 0))
+                return false;
+        }
+        languageSubtagsStartIndex = languageSubtagsEndIndex;
+        if (isEqual || isAsteriskRange) {
+            position = languageSubtagsStartIndex;
+            return true;
+        }
+
+    } while (languageSubtagsStartIndex < languageLength);
+    return false;
+}
+
+ALWAYS_INLINE bool matchesLangPseudoClass(const Element& element, const Vector<AtomicString>& argumentList)
+{
+    AtomicString language;
+#if ENABLE(VIDEO_TRACK)
+    if (is<WebVTTElement>(element))
+        language = downcast<WebVTTElement>(element).language();
+    else
+#endif
+        language = element.computeInheritedLanguage();
+
+    if (language.isEmpty())
+        return false;
+
+    // Implement basic and extended filterings of given language tags
+    // as specified in www.ietf.org/rfc/rfc4647.txt.
+    StringView languageStringView = language.string();
+    unsigned languageLength = language.length();
+    for (const AtomicString& range : argumentList) {
+        if (range.isEmpty())
+            continue;
+
+        if (range == "*")
+            return true;
+
+        StringView rangeStringView = range.string();
+        if (equalIgnoringASCIICase(languageStringView, rangeStringView) && !languageStringView.contains('-'))
+            return true;
+        
+        unsigned rangeLength = rangeStringView.length();
+        unsigned rangeSubtagsStartIndex = 0;
+        unsigned rangeSubtagsEndIndex = rangeLength;
+        unsigned lastMatchedLanguageSubtagIndex = 0;
+
+        bool matchedRange = true;
+        do {
+            if (rangeSubtagsStartIndex > 0)
+                rangeSubtagsStartIndex += 1;
+            if (rangeSubtagsStartIndex > languageLength)
+                return false;
+            rangeSubtagsEndIndex = std::min<unsigned>(rangeStringView.find('-', rangeSubtagsStartIndex), rangeLength);
+            StringView rangeSubtag = rangeStringView.substring(rangeSubtagsStartIndex, rangeSubtagsEndIndex - rangeSubtagsStartIndex);
+            if (!containslanguageSubtagMatchingRange(languageStringView, rangeSubtag, languageLength, lastMatchedLanguageSubtagIndex)) {
+                matchedRange = false;
+                break;
+            }
+            rangeSubtagsStartIndex = rangeSubtagsEndIndex;
+        } while (rangeSubtagsStartIndex < rangeLength);
+        if (matchedRange)
+            return true;
+    }
+    return false;
+}
+
+ALWAYS_INLINE bool matchesReadOnlyPseudoClass(const Element& element)
+{
+    return !element.matchesReadWritePseudoClass();
+}
+
+ALWAYS_INLINE bool matchesReadWritePseudoClass(const Element& element)
+{
+    return element.matchesReadWritePseudoClass();
+}
+
+ALWAYS_INLINE bool matchesIndeterminatePseudoClass(const Element& element)
+{
+    return element.matchesIndeterminatePseudoClass();
+}
+
+ALWAYS_INLINE bool scrollbarMatchesEnabledPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbar && context.scrollbar->enabled();
+}
+
+ALWAYS_INLINE bool scrollbarMatchesDisabledPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbar && !context.scrollbar->enabled();
+}
+
+ALWAYS_INLINE bool scrollbarMatchesHoverPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    if (!context.scrollbar)
+        return false;
+    ScrollbarPart hoveredPart = context.scrollbar->hoveredPart();
+    if (context.scrollbarPart == ScrollbarBGPart)
+        return hoveredPart != NoPart;
+    if (context.scrollbarPart == TrackBGPart)
+        return hoveredPart == BackTrackPart || hoveredPart == ForwardTrackPart || hoveredPart == ThumbPart;
+    return context.scrollbarPart == hoveredPart;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesActivePseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    if (!context.scrollbar)
+        return false;
+    ScrollbarPart pressedPart = context.scrollbar->pressedPart();
+    if (context.scrollbarPart == ScrollbarBGPart)
+        return pressedPart != NoPart;
+    if (context.scrollbarPart == TrackBGPart)
+        return pressedPart == BackTrackPart || pressedPart == ForwardTrackPart || pressedPart == ThumbPart;
+    return context.scrollbarPart == pressedPart;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesHorizontalPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbar && context.scrollbar->orientation() == HorizontalScrollbar;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesVerticalPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbar && context.scrollbar->orientation() == VerticalScrollbar;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesDecrementPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbarPart == BackButtonStartPart || context.scrollbarPart == BackButtonEndPart || context.scrollbarPart == BackTrackPart;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesIncrementPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbarPart == ForwardButtonStartPart || context.scrollbarPart == ForwardButtonEndPart || context.scrollbarPart == ForwardTrackPart;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesStartPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbarPart == BackButtonStartPart || context.scrollbarPart == ForwardButtonStartPart || context.scrollbarPart == BackTrackPart;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesEndPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbarPart == BackButtonEndPart || context.scrollbarPart == ForwardButtonEndPart || context.scrollbarPart == ForwardTrackPart;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesDoubleButtonPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    if (!context.scrollbar)
+        return false;
+    ScrollbarButtonsPlacement buttonsPlacement = context.scrollbar->theme().buttonsPlacement();
+    if (context.scrollbarPart == BackButtonStartPart || context.scrollbarPart == ForwardButtonStartPart || context.scrollbarPart == BackTrackPart)
+        return buttonsPlacement == ScrollbarButtonsDoubleStart || buttonsPlacement == ScrollbarButtonsDoubleBoth;
+    if (context.scrollbarPart == BackButtonEndPart || context.scrollbarPart == ForwardButtonEndPart || context.scrollbarPart == ForwardTrackPart)
+        return buttonsPlacement == ScrollbarButtonsDoubleEnd || buttonsPlacement == ScrollbarButtonsDoubleBoth;
+    return false;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesSingleButtonPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    if (!context.scrollbar)
+        return false;
+    ScrollbarButtonsPlacement buttonsPlacement = context.scrollbar->theme().buttonsPlacement();
+    if (context.scrollbarPart == BackButtonStartPart || context.scrollbarPart == ForwardButtonEndPart || context.scrollbarPart == BackTrackPart || context.scrollbarPart == ForwardTrackPart)
+        return buttonsPlacement == ScrollbarButtonsSingle;
+    return false;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesNoButtonPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    if (!context.scrollbar)
+        return false;
+    ScrollbarButtonsPlacement buttonsPlacement = context.scrollbar->theme().buttonsPlacement();
+    if (context.scrollbarPart == BackTrackPart)
+        return buttonsPlacement == ScrollbarButtonsNone || buttonsPlacement == ScrollbarButtonsDoubleEnd;
+    if (context.scrollbarPart == ForwardTrackPart)
+        return buttonsPlacement == ScrollbarButtonsNone || buttonsPlacement == ScrollbarButtonsDoubleStart;
+    return false;
+}
+
+ALWAYS_INLINE bool scrollbarMatchesCornerPresentPseudoClass(const SelectorChecker::CheckingContext& context)
+{
+    return context.scrollbar && context.scrollbar->scrollableArea().isScrollCornerVisible();
+}
+
+#if ENABLE(FULLSCREEN_API)
+ALWAYS_INLINE bool matchesFullScreenPseudoClass(const Element& element)
+{
+    // While a Document is in the fullscreen state, and the document's current fullscreen
+    // element is an element in the document, the 'full-screen' pseudoclass applies to
+    // that element. Also, an <iframe>, <object> or <embed> element whose child browsing
+    // context's Document is in the fullscreen state has the 'full-screen' pseudoclass applied.
+    if (element.isFrameElementBase() && element.containsFullScreenElement())
+        return true;
+    if (!element.document().webkitIsFullScreen())
+        return false;
+    return &element == element.document().webkitCurrentFullScreenElement();
+}
+
+ALWAYS_INLINE bool matchesFullScreenAnimatingFullScreenTransitionPseudoClass(const Element& element)
+{
+    if (&element != element.document().webkitCurrentFullScreenElement())
+        return false;
+    return element.document().isAnimatingFullScreen();
+}
+
+ALWAYS_INLINE bool matchesFullScreenAncestorPseudoClass(const Element& element)
+{
+    return element.containsFullScreenElement();
+}
+
+ALWAYS_INLINE bool matchesFullScreenDocumentPseudoClass(const Element& element)
+{
+    // While a Document is in the fullscreen state, the 'full-screen-document' pseudoclass applies
+    // to all elements of that Document.
+    if (!element.document().webkitIsFullScreen())
+        return false;
+    return true;
+}
+#endif
+
+#if ENABLE(VIDEO_TRACK)
+ALWAYS_INLINE bool matchesFutureCuePseudoClass(const Element& element)
+{
+    return is<WebVTTElement>(element) && !downcast<WebVTTElement>(element).isPastNode();
+}
+
+ALWAYS_INLINE bool matchesPastCuePseudoClass(const Element& element)
+{
+    return is<WebVTTElement>(element) && downcast<WebVTTElement>(element).isPastNode();
+}
+#endif
+
+} // namespace WebCore