/
StyleAdjuster.cpp
1148 lines (995 loc) · 49.9 KB
/
StyleAdjuster.cpp
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005-2023 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Copyright (C) 2012-2020 Google Inc. All rights reserved.
* Copyright (C) 2014, 2020, 2022 Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "StyleAdjuster.h"
#include "CSSFontSelector.h"
#include "DOMTokenList.h"
#include "Document.h"
#include "DocumentInlines.h"
#include "ElementAncestorIterator.h"
#include "ElementAncestorIteratorInlines.h"
#include "ElementInlines.h"
#include "EventNames.h"
#include "HTMLBodyElement.h"
#include "HTMLDialogElement.h"
#include "HTMLDivElement.h"
#include "HTMLInputElement.h"
#include "HTMLMarqueeElement.h"
#include "HTMLNames.h"
#include "HTMLSlotElement.h"
#include "HTMLTableElement.h"
#include "HTMLTextAreaElement.h"
#include "HTMLVideoElement.h"
#include "LocalDOMWindow.h"
#include "LocalFrameView.h"
#include "MathMLElement.h"
#include "NodeName.h"
#include "Page.h"
#include "Quirks.h"
#include "RenderBox.h"
#include "RenderStyleSetters.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "SVGElement.h"
#include "SVGGraphicsElement.h"
#include "SVGNames.h"
#include "SVGSVGElement.h"
#include "SVGURIReference.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "StyleSelfAlignmentData.h"
#include "StyleUpdate.h"
#include "Styleable.h"
#include "Text.h"
#include "TouchAction.h"
#include "TypedElementDescendantIterator.h"
#include "TypedElementDescendantIteratorInlines.h"
#include "VisibilityAdjustment.h"
#include "WebAnimationTypes.h"
#include <wtf/RobinHoodHashSet.h>
#if PLATFORM(COCOA)
#include <wtf/cocoa/RuntimeApplicationChecksCocoa.h>
#endif
#if ENABLE(FULLSCREEN_API)
#include "FullscreenManager.h"
#endif
namespace WebCore {
namespace Style {
using namespace HTMLNames;
Adjuster::Adjuster(const Document& document, const RenderStyle& parentStyle, const RenderStyle* parentBoxStyle, Element* element)
: m_document(document)
, m_parentStyle(parentStyle)
, m_parentBoxStyle(parentBoxStyle ? *parentBoxStyle : m_parentStyle)
, m_element(element)
{
}
#if PLATFORM(COCOA)
static void addIntrinsicMargins(RenderStyle& style)
{
// Intrinsic margin value.
const int intrinsicMargin = clampToInteger(2 * style.usedZoom());
// FIXME: Using width/height alone and not also dealing with min-width/max-width is flawed.
// FIXME: Using "hasQuirk" to decide the margin wasn't set is kind of lame.
if (style.width().isIntrinsicOrAuto()) {
if (style.marginLeft().hasQuirk())
style.setMarginLeft(Length(intrinsicMargin, LengthType::Fixed));
if (style.marginRight().hasQuirk())
style.setMarginRight(Length(intrinsicMargin, LengthType::Fixed));
}
if (style.height().isAuto()) {
if (style.marginTop().hasQuirk())
style.setMarginTop(Length(intrinsicMargin, LengthType::Fixed));
if (style.marginBottom().hasQuirk())
style.setMarginBottom(Length(intrinsicMargin, LengthType::Fixed));
}
}
#endif
// https://www.w3.org/TR/css-display-3/#transformations
static DisplayType equivalentBlockDisplay(const RenderStyle& style)
{
switch (auto display = style.display()) {
case DisplayType::Block:
case DisplayType::Table:
case DisplayType::Box:
case DisplayType::Flex:
case DisplayType::Grid:
case DisplayType::FlowRoot:
case DisplayType::ListItem:
case DisplayType::RubyBlock:
return display;
case DisplayType::InlineTable:
return DisplayType::Table;
case DisplayType::InlineBox:
return DisplayType::Box;
case DisplayType::InlineFlex:
return DisplayType::Flex;
case DisplayType::InlineGrid:
return DisplayType::Grid;
case DisplayType::Ruby:
return DisplayType::RubyBlock;
case DisplayType::Inline:
case DisplayType::InlineBlock:
case DisplayType::TableRowGroup:
case DisplayType::TableHeaderGroup:
case DisplayType::TableFooterGroup:
case DisplayType::TableRow:
case DisplayType::TableColumnGroup:
case DisplayType::TableColumn:
case DisplayType::TableCell:
case DisplayType::TableCaption:
case DisplayType::RubyBase:
case DisplayType::RubyAnnotation:
return DisplayType::Block;
case DisplayType::Contents:
ASSERT_NOT_REACHED();
return DisplayType::Contents;
case DisplayType::None:
ASSERT_NOT_REACHED();
return DisplayType::None;
}
ASSERT_NOT_REACHED();
return DisplayType::Block;
}
// https://www.w3.org/TR/css-display-3/#transformations
static DisplayType equivalentInlineDisplay(const RenderStyle& style)
{
switch (auto display = style.display()) {
case DisplayType::Block:
return DisplayType::InlineBlock;
case DisplayType::Table:
return DisplayType::InlineTable;
case DisplayType::Box:
return DisplayType::InlineBox;
case DisplayType::Flex:
return DisplayType::InlineFlex;
case DisplayType::Grid:
return DisplayType::InlineGrid;
case DisplayType::RubyBlock:
return DisplayType::Ruby;
case DisplayType::Inline:
case DisplayType::InlineBlock:
case DisplayType::InlineTable:
case DisplayType::InlineBox:
case DisplayType::InlineFlex:
case DisplayType::InlineGrid:
case DisplayType::Ruby:
case DisplayType::RubyBase:
case DisplayType::RubyAnnotation:
return display;
case DisplayType::FlowRoot:
case DisplayType::ListItem:
case DisplayType::TableRowGroup:
case DisplayType::TableHeaderGroup:
case DisplayType::TableFooterGroup:
case DisplayType::TableRow:
case DisplayType::TableColumnGroup:
case DisplayType::TableColumn:
case DisplayType::TableCell:
case DisplayType::TableCaption:
return DisplayType::Inline;
case DisplayType::Contents:
ASSERT_NOT_REACHED();
return DisplayType::Contents;
case DisplayType::None:
ASSERT_NOT_REACHED();
return DisplayType::None;
}
ASSERT_NOT_REACHED();
return DisplayType::Inline;
}
static bool shouldInheritTextDecorationsInEffect(const RenderStyle& style, const Element* element)
{
if (style.isFloating() || style.hasOutOfFlowPosition())
return false;
// Media elements have a special rendering where the media controls do not use a proper containing
// block model which means we need to manually stop text-decorations to apply to text inside media controls.
auto isAtMediaUAShadowBoundary = [&] {
#if ENABLE(VIDEO)
if (!element)
return false;
auto* parentNode = element->parentNode();
return parentNode && parentNode->isUserAgentShadowRoot() && parentNode->parentOrShadowHostElement()->isMediaElement();
#else
return false;
#endif
}();
// Outermost <svg> roots are considered to be atomic inline-level.
if (RefPtr svgElement = dynamicDowncast<SVGElement>(element); svgElement && svgElement->isOutermostSVGSVGElement())
return false;
// There is no other good way to prevent decorations from affecting user agent shadow trees.
if (isAtMediaUAShadowBoundary)
return false;
switch (style.display()) {
case DisplayType::InlineTable:
case DisplayType::InlineBlock:
case DisplayType::InlineGrid:
case DisplayType::InlineFlex:
case DisplayType::InlineBox:
return false;
default:
break;
};
return true;
}
static bool isScrollableOverflow(Overflow overflow)
{
return overflow == Overflow::Scroll || overflow == Overflow::Auto;
}
static OptionSet<TouchAction> computeUsedTouchActions(const RenderStyle& style, OptionSet<TouchAction> usedTouchActions)
{
// https://w3c.github.io/pointerevents/#determining-supported-touch-behavior
// "A touch behavior is supported if it conforms to the touch-action property of each element between
// the hit tested element and its nearest ancestor with the default touch behavior (including both the
// hit tested element and the element with the default touch behavior)."
bool hasDefaultTouchBehavior = isScrollableOverflow(style.overflowX()) || isScrollableOverflow(style.overflowY());
if (hasDefaultTouchBehavior)
usedTouchActions = RenderStyle::initialTouchActions();
auto touchActions = style.touchActions();
if (touchActions == RenderStyle::initialTouchActions())
return usedTouchActions;
if (usedTouchActions.contains(TouchAction::None))
return { TouchAction::None };
if (usedTouchActions.containsAny({ TouchAction::Auto, TouchAction::Manipulation }))
return touchActions;
if (touchActions.containsAny({ TouchAction::Auto, TouchAction::Manipulation }))
return usedTouchActions;
auto sharedTouchActions = usedTouchActions & touchActions;
if (sharedTouchActions.isEmpty())
return { TouchAction::None };
return sharedTouchActions;
}
bool Adjuster::adjustEventListenerRegionTypesForRootStyle(RenderStyle& rootStyle, const Document& document)
{
auto regionTypes = computeEventListenerRegionTypes(document, rootStyle, document, { });
if (auto* window = document.domWindow())
regionTypes.add(computeEventListenerRegionTypes(document, rootStyle, *window, { }));
bool changed = regionTypes != rootStyle.eventListenerRegionTypes();
rootStyle.setEventListenerRegionTypes(regionTypes);
return changed;
}
OptionSet<EventListenerRegionType> Adjuster::computeEventListenerRegionTypes(const Document& document, const RenderStyle& style, const EventTarget& eventTarget, OptionSet<EventListenerRegionType> parentTypes)
{
auto types = parentTypes;
#if ENABLE(WHEEL_EVENT_REGIONS)
auto findListeners = [&](auto& eventName, auto type, auto nonPassiveType) {
auto* eventListenerVector = eventTarget.eventTargetData()->eventListenerMap.find(eventName);
if (!eventListenerVector)
return;
types.add(type);
auto isPassiveOnly = [&] {
for (auto& listener : *eventListenerVector) {
if (!listener->isPassive())
return false;
}
return true;
}();
if (!isPassiveOnly)
types.add(nonPassiveType);
};
if (eventTarget.hasEventListeners()) {
findListeners(eventNames().wheelEvent, EventListenerRegionType::Wheel, EventListenerRegionType::NonPassiveWheel);
findListeners(eventNames().mousewheelEvent, EventListenerRegionType::Wheel, EventListenerRegionType::NonPassiveWheel);
}
#endif
#if ENABLE(INTERACTION_REGIONS_IN_EVENT_REGION)
if (document.page() && document.page()->shouldBuildInteractionRegions()) {
if (const auto* node = dynamicDowncast<Node>(eventTarget)) {
if (node->willRespondToMouseClickEventsWithEditability(node->computeEditabilityForMouseClickEvents(&style)))
types.add(EventListenerRegionType::MouseClick);
}
}
#else
UNUSED_PARAM(document);
UNUSED_PARAM(style);
#endif
#if !ENABLE(WHEEL_EVENT_REGIONS) && !ENABLE(INTERACTION_REGIONS_IN_EVENT_REGION)
UNUSED_PARAM(eventTarget);
#endif
return types;
}
static bool isOverflowClipOrVisible(Overflow overflow)
{
return overflow == Overflow::Clip || overflow == Overflow::Visible;
}
static bool shouldInlinifyForRuby(const RenderStyle& style, const RenderStyle& parentBoxStyle)
{
auto parentDisplay = parentBoxStyle.display();
auto hasRubyParent = parentDisplay == DisplayType::Ruby
|| parentDisplay == DisplayType::RubyBlock
|| parentDisplay == DisplayType::RubyAnnotation
|| parentDisplay == DisplayType::RubyBase;
return hasRubyParent && !style.hasOutOfFlowPosition() && !style.isFloating();
}
static bool isRubyContainerOrInternalRubyBox(const RenderStyle& style)
{
auto display = style.display();
return display == DisplayType::Ruby
|| display == DisplayType::RubyAnnotation
|| display == DisplayType::RubyBase;
}
static bool hasUnsupportedRubyDisplay(DisplayType display, const Element* element)
{
// Only allow ruby elements to have ruby display types for now.
switch (display) {
case DisplayType::Ruby:
case DisplayType::RubyBlock:
// Test for localName so this also allows WebVTT ruby elements.
return !element || !element->hasLocalName(rubyTag->localName());
case DisplayType::RubyAnnotation:
return !element || !element->hasLocalName(rtTag->localName());
case DisplayType::RubyBase:
ASSERT_NOT_REACHED();
return false;
default:
return false;
}
}
// https://drafts.csswg.org/css-ruby-1/#bidi
static UnicodeBidi forceBidiIsolationForRuby(UnicodeBidi unicodeBidi)
{
switch (unicodeBidi) {
case UnicodeBidi::Normal:
case UnicodeBidi::Embed:
case UnicodeBidi::Isolate:
return UnicodeBidi::Isolate;
case UnicodeBidi::Override:
case UnicodeBidi::IsolateOverride:
return UnicodeBidi::IsolateOverride;
case UnicodeBidi::Plaintext:
return UnicodeBidi::Plaintext;
}
ASSERT_NOT_REACHED();
return UnicodeBidi::Isolate;
}
void Adjuster::adjust(RenderStyle& style, const RenderStyle* userAgentAppearanceStyle) const
{
if (style.display() == DisplayType::Contents)
adjustDisplayContentsStyle(style);
if (m_element && (m_element->hasTagName(frameTag) || m_element->hasTagName(framesetTag))) {
// Framesets ignore display and position properties.
style.setPosition(PositionType::Static);
style.setEffectiveDisplay(DisplayType::Block);
}
if (style.display() != DisplayType::None && style.display() != DisplayType::Contents) {
if (m_element) {
// Tables never support the -webkit-* values for text-align and will reset back to the default.
if (is<HTMLTableElement>(*m_element) && (style.textAlign() == TextAlignMode::WebKitLeft || style.textAlign() == TextAlignMode::WebKitCenter || style.textAlign() == TextAlignMode::WebKitRight))
style.setTextAlign(TextAlignMode::Start);
// Ruby text does not support float or position. This might change with evolution of the specification.
if (m_element->hasTagName(rtTag)) {
style.setPosition(PositionType::Static);
style.setFloating(Float::None);
}
if (m_element->hasTagName(legendTag))
style.setEffectiveDisplay(equivalentBlockDisplay(style));
}
if (hasUnsupportedRubyDisplay(style.display(), m_element))
style.setEffectiveDisplay(style.display() == DisplayType::RubyBlock ? DisplayType::Block : DisplayType::Inline);
// Top layer elements are always position: absolute; unless the position is set to fixed.
// https://fullscreen.spec.whatwg.org/#new-stacking-layer
if (m_element != m_document.documentElement() && style.position() != PositionType::Absolute && style.position() != PositionType::Fixed && isInTopLayerOrBackdrop(style, m_element))
style.setPosition(PositionType::Absolute);
// Absolute/fixed positioned elements, floating elements and the document element need block-like outside display.
if (style.hasOutOfFlowPosition() || style.isFloating() || (m_element && m_document.documentElement() == m_element))
style.setEffectiveDisplay(equivalentBlockDisplay(style));
// FIXME: Don't support this mutation for pseudo styles like first-letter or first-line, since it's not completely
// clear how that should work.
if (style.display() == DisplayType::Inline && style.pseudoElementType() == PseudoId::None && style.writingMode() != m_parentStyle.writingMode())
style.setEffectiveDisplay(DisplayType::InlineBlock);
// After performing the display mutation, check table rows. We do not honor position:relative or position:sticky on
// table rows or cells. This has been established for position:relative in CSS2.1 (and caused a crash in containingBlock()
// on some sites).
if ((style.display() == DisplayType::TableHeaderGroup || style.display() == DisplayType::TableRowGroup
|| style.display() == DisplayType::TableFooterGroup || style.display() == DisplayType::TableRow)
&& style.position() == PositionType::Relative)
style.setPosition(PositionType::Static);
// writing-mode does not apply to table row groups, table column groups, table rows, and table columns.
// FIXME: Table cells should be allowed to be perpendicular or flipped with respect to the table, though.
if (style.display() == DisplayType::TableColumn || style.display() == DisplayType::TableColumnGroup || style.display() == DisplayType::TableFooterGroup
|| style.display() == DisplayType::TableHeaderGroup || style.display() == DisplayType::TableRow || style.display() == DisplayType::TableRowGroup
|| style.display() == DisplayType::TableCell)
style.setWritingMode(m_parentStyle.writingMode());
if (style.isDisplayDeprecatedFlexibleBox()) {
// FIXME: Since we don't support block-flow on flexible boxes yet, disallow setting
// of block-flow to anything other than WritingMode::HorizontalTb.
// https://bugs.webkit.org/show_bug.cgi?id=46418 - Flexible box support.
style.setWritingMode(WritingMode::HorizontalTb);
}
if (m_parentBoxStyle.isDisplayDeprecatedFlexibleBox())
style.setFloating(Float::None);
// https://www.w3.org/TR/css-display/#transformations
// "A parent with a grid or flex display value blockifies the box’s display type."
if (m_parentBoxStyle.isDisplayFlexibleOrGridBox()) {
style.setFloating(Float::None);
style.setEffectiveDisplay(equivalentBlockDisplay(style));
}
// https://www.w3.org/TR/css-ruby-1/#anon-gen-inlinize
if (shouldInlinifyForRuby(style, m_parentBoxStyle))
style.setEffectiveDisplay(equivalentInlineDisplay(style));
// https://drafts.csswg.org/css-ruby-1/#bidi
if (isRubyContainerOrInternalRubyBox(style))
style.setUnicodeBidi(forceBidiIsolationForRuby(style.unicodeBidi()));
}
auto hasAutoZIndex = [](const RenderStyle& style, const RenderStyle& parentBoxStyle, const Element* element) {
if (style.hasAutoSpecifiedZIndex())
return true;
// SVG2: Contrary to the rules in CSS 2.1, the z-index property applies to all SVG elements regardless
// of the value of the position property, with one exception: as for boxes in CSS 2.1, outer ‘svg’ elements
// must be positioned for z-index to apply to them.
if (element && element->document().settings().layerBasedSVGEngineEnabled()) {
if (RefPtr svgElement = dynamicDowncast<SVGElement>(*element); svgElement && svgElement->isOutermostSVGSVGElement())
return element->renderer() && element->renderer()->style().position() == PositionType::Static;
return false;
}
// Make sure our z-index value is only applied if the object is positioned.
return style.position() == PositionType::Static && !parentBoxStyle.isDisplayFlexibleOrGridBox();
};
if (hasAutoZIndex(style, m_parentBoxStyle, m_element))
style.setHasAutoUsedZIndex();
else
style.setUsedZIndex(style.specifiedZIndex());
// For SVG compatibility purposes we have to consider the 'animatedLocalTransform' besides the RenderStyle to query
// if an element has a transform. SVG transforms are not stored on the RenderStyle, and thus we need a special case here.
// Same for the additional translation component present in RenderSVGTransformableContainer (that stems from <use> x/y
// properties, that are transferred to the internal RenderSVGTransformableContainer), or for the viewBox-induced transformation
// in RenderSVGViewportContainer. They all need to return true for 'hasTransformRelatedProperty'.
auto hasTransformRelatedProperty = [](const RenderStyle& style, const Element* element, const RenderStyle& parentStyle) {
if (element && element->document().settings().css3DTransformBackfaceVisibilityInteroperabilityEnabled() && style.backfaceVisibility() == BackfaceVisibility::Hidden && parentStyle.preserves3D())
return true;
if (style.hasTransformRelatedProperty())
return true;
if (element && element->document().settings().layerBasedSVGEngineEnabled()) {
if (auto* graphicsElement = dynamicDowncast<SVGGraphicsElement>(element); graphicsElement && graphicsElement->hasTransformRelatedAttributes())
return true;
}
return false;
};
// Auto z-index becomes 0 for the root element and transparent objects. This prevents
// cases where objects that should be blended as a single unit end up with a non-transparent
// object wedged in between them. Auto z-index also becomes 0 for objects that specify transforms/masks/reflections.
if (style.hasAutoUsedZIndex()) {
if ((m_element && m_document.documentElement() == m_element)
|| style.hasOpacity()
|| hasTransformRelatedProperty(style, m_element, m_parentStyle)
|| style.hasMask()
|| style.clipPath()
|| style.boxReflect()
|| style.hasFilter()
|| style.hasBackdropFilter()
|| style.hasBlendMode()
|| style.hasIsolation()
|| style.position() == PositionType::Sticky
|| style.position() == PositionType::Fixed
|| style.willChangeCreatesStackingContext()
|| isInTopLayerOrBackdrop(style, m_element))
style.setUsedZIndex(0);
}
if (m_element) {
// Textarea considers overflow visible as auto.
if (is<HTMLTextAreaElement>(*m_element)) {
style.setOverflowX(style.overflowX() == Overflow::Visible ? Overflow::Auto : style.overflowX());
style.setOverflowY(style.overflowY() == Overflow::Visible ? Overflow::Auto : style.overflowY());
}
if (RefPtr input = dynamicDowncast<HTMLInputElement>(*m_element); input && input->isPasswordField())
style.setTextSecurity(style.inputSecurity() == InputSecurity::Auto ? TextSecurity::Disc : TextSecurity::None);
// Disallow -webkit-user-modify on :pseudo and ::pseudo elements.
if (m_element->isInUserAgentShadowTree() && !m_element->userAgentPart().isNull())
style.setUserModify(UserModify::ReadOnly);
if (is<HTMLMarqueeElement>(*m_element)) {
// For now, <marquee> requires an overflow clip to work properly.
style.setOverflowX(Overflow::Hidden);
style.setOverflowY(Overflow::Hidden);
bool isVertical = style.marqueeDirection() == MarqueeDirection::Up || style.marqueeDirection() == MarqueeDirection::Down;
// Make horizontal marquees not wrap.
if (!isVertical) {
style.setWhiteSpaceCollapse(WhiteSpaceCollapse::Collapse);
style.setTextWrapMode(TextWrapMode::NoWrap);
style.setTextAlign(TextAlignMode::Start);
}
// Apparently this is the expected legacy behavior.
if (isVertical && style.height().isAuto())
style.setHeight(Length(200, LengthType::Fixed));
}
if (UNLIKELY(m_element->visibilityAdjustment().contains(VisibilityAdjustment::Subtree) || m_parentStyle.isInVisibilityAdjustmentSubtree()))
style.setIsInVisibilityAdjustmentSubtree();
}
if (shouldInheritTextDecorationsInEffect(style, m_element))
style.addToTextDecorationsInEffect(style.textDecorationLine());
else
style.setTextDecorationsInEffect(style.textDecorationLine());
bool overflowIsClipOrVisible = isOverflowClipOrVisible(style.overflowX()) && isOverflowClipOrVisible(style.overflowX());
if (!overflowIsClipOrVisible && (style.display() == DisplayType::Table || style.display() == DisplayType::InlineTable)) {
// Tables only support overflow:hidden and overflow:visible and ignore anything else,
// see https://drafts.csswg.org/css2/#overflow. As a table is not a block
// container box the rules for resolving conflicting x and y values in CSS Overflow Module
// Level 3 do not apply. Arguably overflow-x and overflow-y aren't allowed on tables but
// all UAs allow it.
if (style.overflowX() != Overflow::Hidden)
style.setOverflowX(Overflow::Visible);
if (style.overflowY() != Overflow::Hidden)
style.setOverflowY(Overflow::Visible);
// If we are left with conflicting overflow values for the x and y axes on a table then resolve
// both to Overflow::Visible. This is interoperable behaviour but is not specced anywhere.
if (style.overflowX() == Overflow::Visible)
style.setOverflowY(Overflow::Visible);
else if (style.overflowY() == Overflow::Visible)
style.setOverflowX(Overflow::Visible);
} else if (!isOverflowClipOrVisible(style.overflowY())) {
// FIXME: Once we implement pagination controls, overflow-x should default to hidden
// if overflow-y is set to -webkit-paged-x or -webkit-page-y. For now, we'll let it
// default to auto so we can at least scroll through the pages.
// Values of 'clip' and 'visible' can only be used with 'clip' and 'visible'.
// If they aren't, 'clip' and 'visible' is reset.
if (style.overflowX() == Overflow::Visible)
style.setOverflowX(Overflow::Auto);
else if (style.overflowX() == Overflow::Clip)
style.setOverflowX(Overflow::Hidden);
} else if (!isOverflowClipOrVisible(style.overflowX())) {
// Values of 'clip' and 'visible' can only be used with 'clip' and 'visible'.
// If they aren't, 'clip' and 'visible' is reset.
if (style.overflowY() == Overflow::Visible)
style.setOverflowY(Overflow::Auto);
else if (style.overflowY() == Overflow::Clip)
style.setOverflowY(Overflow::Hidden);
}
// Call setStylesForPaginationMode() if a pagination mode is set for any non-root elements. If these
// styles are specified on a root element, then they will be incorporated in
// Style::createForm_document.
if ((style.overflowY() == Overflow::PagedX || style.overflowY() == Overflow::PagedY) && !(m_element && (m_element->hasTagName(htmlTag) || m_element->hasTagName(bodyTag))))
style.setColumnStylesFromPaginationMode(WebCore::paginationModeForRenderStyle(style));
#if ENABLE(OVERFLOW_SCROLLING_TOUCH)
// Touch overflow scrolling creates a stacking context.
if (style.hasAutoUsedZIndex() && style.useTouchOverflowScrolling() && (isScrollableOverflow(style.overflowX()) || isScrollableOverflow(style.overflowY())))
style.setUsedZIndex(0);
#endif
// Cull out any useless layers and also repeat patterns into additional layers.
style.adjustBackgroundLayers();
style.adjustMaskLayers();
// Do the same for animations and transitions.
style.adjustAnimations();
style.adjustTransitions();
// Do the same for scroll-timeline and view-timeline longhands.
style.adjustScrollTimelines();
style.adjustViewTimelines();
#if PLATFORM(COCOA)
if (!linkedOnOrAfterSDKWithBehavior(SDKAlignedBehavior::DoesNotAddIntrinsicMarginsToFormControls)) {
// Important: Intrinsic margins get added to controls before the theme has adjusted the style, since the theme will
// alter fonts and heights/widths.
if (is<HTMLFormControlElement>(m_element) && style.computedFontSize() >= 11) {
// Don't apply intrinsic margins to image buttons. The designer knows how big the images are,
// so we have to treat all image buttons as though they were explicitly sized.
if (RefPtr input = dynamicDowncast<HTMLInputElement>(*m_element); !input || !input->isImageButton())
addIntrinsicMargins(style);
}
}
#endif
// Let the theme also have a crack at adjusting the style.
if (style.hasAppearance())
adjustThemeStyle(style, userAgentAppearanceStyle);
// If we have first-letter pseudo style, do not share this style.
if (style.hasPseudoStyle(PseudoId::FirstLetter))
style.setUnique();
// This should be kept in sync with requiresRenderingConsolidationForViewTransition
if (style.preserves3D()) {
bool forceToFlat = style.overflowX() != Overflow::Visible
|| style.hasOpacity()
|| style.overflowY() != Overflow::Visible
|| style.hasClip()
|| style.clipPath()
|| style.hasFilter()
|| style.hasIsolation()
|| style.hasMask()
|| style.hasBackdropFilter()
|| style.hasBlendMode()
|| style.viewTransitionName();
if (m_element) {
auto styleable = Styleable::fromElement(*m_element);
forceToFlat |= styleable.capturedInViewTransition();
}
style.setTransformStyleForcedToFlat(forceToFlat);
}
if (RefPtr element = dynamicDowncast<SVGElement>(m_element))
adjustSVGElementStyle(style, *element);
// If the inherited value of justify-items includes the 'legacy' keyword (plus 'left', 'right' or
// 'center'), 'legacy' computes to the the inherited value. Otherwise, 'auto' computes to 'normal'.
if (m_parentBoxStyle.justifyItems().positionType() == ItemPositionType::Legacy && style.justifyItems().position() == ItemPosition::Legacy)
style.setJustifyItems(m_parentBoxStyle.justifyItems());
style.setUsedTouchActions(computeUsedTouchActions(style, m_parentStyle.usedTouchActions()));
// Counterparts in Element::addToTopLayer/removeFromTopLayer & SharingResolver::canShareStyleWithElement need to match!
auto hasInertAttribute = [] (const Element* element) -> bool {
return is<HTMLElement>(element) && element->hasAttributeWithoutSynchronization(HTMLNames::inertAttr);
};
auto isInertSubtreeRoot = [this, hasInertAttribute] (const Element* element) -> bool {
if (m_document.activeModalDialog() && element == m_document.documentElement())
return true;
if (hasInertAttribute(element))
return true;
#if ENABLE(FULLSCREEN_API)
if (CheckedPtr fullscreenManager = m_document.fullscreenManagerIfExists(); fullscreenManager && fullscreenManager->fullscreenElement() && element == m_document.documentElement())
return true;
#endif
return false;
};
if (isInertSubtreeRoot(m_element))
style.setEffectiveInert(true);
if (m_element) {
// Make sure the active dialog is interactable when the whole document is blocked by the modal dialog
if (m_element == m_document.activeModalDialog() && !hasInertAttribute(m_element))
style.setEffectiveInert(false);
#if ENABLE(FULLSCREEN_API)
if (CheckedPtr fullscreenManager = m_document.fullscreenManagerIfExists(); fullscreenManager && m_element == fullscreenManager->fullscreenElement() && !hasInertAttribute(m_element))
style.setEffectiveInert(false);
#endif
style.setEventListenerRegionTypes(computeEventListenerRegionTypes(m_document, style, *m_element, m_parentStyle.eventListenerRegionTypes()));
#if ENABLE(INTERACTION_REGIONS_IN_EVENT_REGION)
// Every element will automatically get an interaction region which is not useful, ignoring the `cursor: pointer;` on the body.
if (is<HTMLBodyElement>(*m_element) && style.cursor() == CursorType::Pointer && style.eventListenerRegionTypes().contains(EventListenerRegionType::MouseClick))
style.setCursor(CursorType::Auto);
#endif
#if ENABLE(TEXT_AUTOSIZING)
if (m_document.settings().textAutosizingUsesIdempotentMode())
adjustForTextAutosizing(style, *m_element);
#endif
}
if (isSkippedContentRoot(style, m_element) && m_parentStyle.contentVisibility() != ContentVisibility::Hidden)
style.setUsedContentVisibility(style.contentVisibility());
if (style.contentVisibility() == ContentVisibility::Auto) {
style.containIntrinsicWidthAddAuto();
style.containIntrinsicHeightAddAuto();
}
adjustForSiteSpecificQuirks(style);
}
static bool hasEffectiveDisplayNoneForDisplayContents(const Element& element)
{
using namespace ElementNames;
// https://drafts.csswg.org/css-display-3/#unbox-svg
// FIXME: <g>, <use> and <tspan> have special (?) behavior for display:contents in the current draft spec.
if (is<SVGElement>(element))
return true;
#if ENABLE(MATHML)
// Not sure MathML code can handle it.
if (is<MathMLElement>(element))
return true;
#endif // ENABLE(MATHML)
if (!is<HTMLElement>(element))
return false;
// https://drafts.csswg.org/css-display-3/#unbox-html
switch (element.elementName()) {
case HTML::br:
case HTML::wbr:
case HTML::meter:
case HTML::applet:
case HTML::progress:
case HTML::canvas:
case HTML::embed:
case HTML::object:
case HTML::audio:
case HTML::iframe:
case HTML::img:
case HTML::video:
case HTML::frame:
case HTML::frameset:
case HTML::input:
case HTML::textarea:
case HTML::select:
return true;
default:
break;
}
return false;
}
void Adjuster::adjustDisplayContentsStyle(RenderStyle& style) const
{
bool isInTopLayer = isInTopLayerOrBackdrop(style, m_element);
if (isInTopLayer || m_document.documentElement() == m_element) {
style.setEffectiveDisplay(DisplayType::Block);
return;
}
if (!m_element && style.pseudoElementType() != PseudoId::Before && style.pseudoElementType() != PseudoId::After) {
style.setEffectiveDisplay(DisplayType::None);
return;
}
if (m_element && hasEffectiveDisplayNoneForDisplayContents(*m_element))
style.setEffectiveDisplay(DisplayType::None);
}
void Adjuster::adjustSVGElementStyle(RenderStyle& style, const SVGElement& svgElement)
{
// Only the root <svg> element in an SVG document fragment tree honors css position
if (!svgElement.isOutermostSVGSVGElement())
style.setPosition(RenderStyle::initialPosition());
// SVG2: A new stacking context must be established at an SVG element for its descendants if:
// - it is the root element
// - the "z-index" property applies to the element and its computed value is an integer
// - the element is an outermost svg element, or a "foreignObject", "image", "marker", "mask", "pattern", "symbol" or "use" element
// - the element is an inner "svg" element and the computed value of its "overflow" property is a value other than visible
// - the element is subject to explicit clipping:
// - the "clip" property applies to the element and it has a computed value other than auto
// - the "clip-path" property applies to the element and it has a computed value other than none
// - the "mask" property applies to the element and it has a computed value other than none
// - the "filter" property applies to the element and it has a computed value other than none
// - a property defined in another specification is applied and that property is defined to establish a stacking context in SVG
//
// Some of the rules above were already enforced in StyleResolver::adjust() - for those cases assertions were added.
if (svgElement.document().settings().layerBasedSVGEngineEnabled() && style.hasAutoUsedZIndex()) {
// adjust() has already assigned a z-index of 0 if clip / filter is present or the element is the root element.
ASSERT(!style.clipPath());
ASSERT(!style.hasFilter());
if (svgElement.isOutermostSVGSVGElement()
|| svgElement.hasTagName(SVGNames::foreignObjectTag)
|| svgElement.hasTagName(SVGNames::imageTag)
|| svgElement.hasTagName(SVGNames::markerTag)
|| svgElement.hasTagName(SVGNames::maskTag)
|| svgElement.hasTagName(SVGNames::patternTag)
|| svgElement.hasTagName(SVGNames::symbolTag)
|| svgElement.hasTagName(SVGNames::useTag)
|| (svgElement.isInnerSVGSVGElement() && (style.overflowX() != Overflow::Visible || style.overflowY() != Overflow::Visible))
|| style.hasPositionedMask())
style.setUsedZIndex(0);
}
// (Legacy)RenderSVGRoot handles zooming for the whole SVG subtree, so foreignObject content should
// not be scaled again.
if (svgElement.hasTagName(SVGNames::foreignObjectTag))
style.setUsedZoom(RenderStyle::initialZoom());
// SVG text layout code expects us to be a block-level style element.
if ((svgElement.hasTagName(SVGNames::foreignObjectTag) || svgElement.hasTagName(SVGNames::textTag)) && style.isDisplayInlineType())
style.setEffectiveDisplay(DisplayType::Block);
}
void Adjuster::adjustAnimatedStyle(RenderStyle& style, OptionSet<AnimationImpact> impact) const
{
adjust(style, nullptr);
// Set an explicit used z-index in two cases:
// 1. When the element respects z-index, and the style has an explicit z-index set (for example, the animation
// itself may animate z-index).
// 2. When we want the stacking context side-effets of explicit z-index, via forceStackingContext.
// It's important to not clobber an existing used z-index, since an earlier animation may have set it, but we
// may still need to update the used z-index value from the specified value.
if (style.hasAutoUsedZIndex() && impact.contains(AnimationImpact::ForcesStackingContext))
style.setUsedZIndex(0);
}
void Adjuster::adjustThemeStyle(RenderStyle& style, const RenderStyle* userAgentAppearanceStyle) const
{
ASSERT(style.hasAppearance());
auto isOldWidthAuto = style.width().isAuto();
auto isOldMinWidthAuto = style.minWidth().isAuto();
auto isOldHeightAuto = style.height().isAuto();
auto isOldMinHeightAuto = style.minHeight().isAuto();
RenderTheme::singleton().adjustStyle(style, m_element, userAgentAppearanceStyle);
if (style.containsSize()) {
if (style.containIntrinsicWidthType() != ContainIntrinsicSizeType::None) {
if (isOldWidthAuto)
style.setWidth(Length(LengthType::Auto));
if (isOldMinWidthAuto)
style.setMinWidth(Length(LengthType::Auto));
}
if (style.containIntrinsicHeightType() != ContainIntrinsicSizeType::None) {
if (isOldHeightAuto)
style.setHeight(Length(LengthType::Auto));
if (isOldMinHeightAuto)
style.setMinHeight(Length(LengthType::Auto));
}
}
}
void Adjuster::adjustForSiteSpecificQuirks(RenderStyle& style) const
{
if (!m_element)
return;
if (m_document.quirks().needsGMailOverflowScrollQuirk()) {
// This turns sidebar scrollable without mouse move event.
static MainThreadNeverDestroyed<const AtomString> roleValue("navigation"_s);
if (style.overflowY() == Overflow::Hidden && m_element->attributeWithoutSynchronization(roleAttr) == roleValue)
style.setOverflowY(Overflow::Auto);
}
if (m_document.quirks().needsYouTubeOverflowScrollQuirk()) {
// This turns sidebar scrollable without hover.
static MainThreadNeverDestroyed<const AtomString> idValue("guide-inner-content"_s);
if (style.overflowY() == Overflow::Hidden && m_element->idForStyleResolution() == idValue)
style.setOverflowY(Overflow::Auto);
}
if (m_document.quirks().needsWeChatScrollingQuirk()) {
static MainThreadNeverDestroyed<const AtomString> class1("tree-select"_s);
static MainThreadNeverDestroyed<const AtomString> class2("v-tree-select"_s);
const auto& flexBasis = style.flexBasis();
if (style.minHeight().isAuto()
&& style.display() == DisplayType::Flex
&& style.flexGrow() == 1
&& style.flexShrink() == 1
&& (flexBasis.isPercent() || flexBasis.isFixed())
&& flexBasis.value() == 0
&& const_cast<Element*>(m_element)->classList().contains(class1)
&& const_cast<Element*>(m_element)->classList().contains(class2))
style.setMinHeight(Length(0, LengthType::Fixed));
}
#if ENABLE(VIDEO)
if (m_document.quirks().needsFullscreenDisplayNoneQuirk()) {
if (RefPtr div = dynamicDowncast<HTMLDivElement>(m_element); div && style.display() == DisplayType::None) {
static MainThreadNeverDestroyed<const AtomString> instreamNativeVideoDivClass("instream-native-video--mobile"_s);
static MainThreadNeverDestroyed<const AtomString> videoElementID("vjs_video_3_html5_api"_s);
if (div->hasClass() && div->classNames().contains(instreamNativeVideoDivClass)) {
RefPtr video = dynamicDowncast<HTMLVideoElement>(div->treeScope().getElementById(videoElementID));
if (video && video->isFullscreen())
style.setEffectiveDisplay(DisplayType::Block);
}
}
}
#if ENABLE(FULLSCREEN_API)
if (CheckedPtr fullscreenManager = m_document.fullscreenManagerIfExists(); fullscreenManager && m_document.quirks().needsFullscreenObjectFitQuirk()) {
static MainThreadNeverDestroyed<const AtomString> playerClassName("top-player-video-element"_s);
bool isFullscreen = fullscreenManager->isFullscreen();
RefPtr video = dynamicDowncast<HTMLVideoElement>(m_element);
if (video && isFullscreen && video->hasClass() && video->classNames().contains(playerClassName) && style.objectFit() == ObjectFit::Fill)
style.setObjectFit(ObjectFit::Contain);
}
#endif
#endif
}
void Adjuster::propagateToDocumentElementAndInitialContainingBlock(Update& update, const Document& document)
{
auto* body = document.body();
auto* bodyStyle = body ? update.elementStyle(*body) : nullptr;
auto* documentElementStyle = update.elementStyle(*document.documentElement());
if (!documentElementStyle)
return;
// https://drafts.csswg.org/css-contain-2/#contain-property
// "Additionally, when any containments are active on either the HTML html or body elements, propagation of
// properties from the body element to the initial containing block, the viewport, or the canvas background, is disabled."
auto shouldPropagateFromBody = [&] {
if (bodyStyle && !bodyStyle->usedContain().isEmpty())
return false;
return documentElementStyle->usedContain().isEmpty();
}();
auto writingMode = [&] {
// FIXME: The spec says body should win.
if (documentElementStyle->hasExplicitlySetWritingMode())
return documentElementStyle->writingMode();
if (shouldPropagateFromBody && bodyStyle && bodyStyle->hasExplicitlySetWritingMode())
return bodyStyle->writingMode();
return RenderStyle::initialWritingMode();