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element.cc
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Peter Kelly (pmk@post.com)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* (C) 2007 David Smith (catfish.man@gmail.com)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc.
* All rights reserved.
* (C) 2007 Eric Seidel (eric@webkit.org)
*
* 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 "third_party/blink/renderer/core/dom/element.h"
#include <algorithm>
#include <bitset>
#include <limits>
#include <memory>
#include <utility>
#include "base/feature_list.h"
#include "cc/input/snap_selection_strategy.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/privacy_budget/identifiability_metric_builder.h"
#include "third_party/blink/public/common/privacy_budget/identifiability_study_settings.h"
#include "third_party/blink/public/mojom/scroll/scroll_into_view_params.mojom-blink.h"
#include "third_party/blink/public/web/web_autofill_state.h"
#include "third_party/blink/renderer/bindings/core/v8/dictionary.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_aria_notification_options.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_check_visibility_options.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_get_inner_html_options.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_pointer_lock_options.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_scroll_into_view_options.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_scroll_to_options.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_shadow_root_init.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_union_boolean_scrollintoviewoptions.h"
#include "third_party/blink/renderer/core/accessibility/ax_context.h"
#include "third_party/blink/renderer/core/accessibility/ax_object_cache.h"
#include "third_party/blink/renderer/core/animation/css/css_animations.h"
#include "third_party/blink/renderer/core/animation/element_animations.h"
#include "third_party/blink/renderer/core/aom/accessible_node.h"
#include "third_party/blink/renderer/core/aom/computed_accessible_node.h"
#include "third_party/blink/renderer/core/css/container_query_data.h"
#include "third_party/blink/renderer/core/css/container_query_evaluator.h"
#include "third_party/blink/renderer/core/css/css_identifier_value.h"
#include "third_party/blink/renderer/core/css/css_markup.h"
#include "third_party/blink/renderer/core/css/css_numeric_literal_value.h"
#include "third_party/blink/renderer/core/css/css_primitive_value.h"
#include "third_party/blink/renderer/core/css/css_property_value_set.h"
#include "third_party/blink/renderer/core/css/css_selector_watch.h"
#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/css/css_value.h"
#include "third_party/blink/renderer/core/css/cssom/inline_style_property_map.h"
#include "third_party/blink/renderer/core/css/parser/css_parser.h"
#include "third_party/blink/renderer/core/css/parser/css_selector_parser.h"
#include "third_party/blink/renderer/core/css/post_style_update_scope.h"
#include "third_party/blink/renderer/core/css/property_set_css_style_declaration.h"
#include "third_party/blink/renderer/core/css/resolver/selector_filter_parent_scope.h"
#include "third_party/blink/renderer/core/css/resolver/style_adjuster.h"
#include "third_party/blink/renderer/core/css/resolver/style_resolver.h"
#include "third_party/blink/renderer/core/css/resolver/style_resolver_stats.h"
#include "third_party/blink/renderer/core/css/selector_query.h"
#include "third_party/blink/renderer/core/css/style_change_reason.h"
#include "third_party/blink/renderer/core/css/style_containment_scope_tree.h"
#include "third_party/blink/renderer/core/css/style_engine.h"
#include "third_party/blink/renderer/core/css_value_keywords.h"
#include "third_party/blink/renderer/core/display_lock/display_lock_context.h"
#include "third_party/blink/renderer/core/display_lock/display_lock_document_state.h"
#include "third_party/blink/renderer/core/display_lock/display_lock_utilities.h"
#include "third_party/blink/renderer/core/dom/attr.h"
#include "third_party/blink/renderer/core/dom/container_node.h"
#include "third_party/blink/renderer/core/dom/css_toggle.h"
#include "third_party/blink/renderer/core/dom/css_toggle_inference.h"
#include "third_party/blink/renderer/core/dom/css_toggle_key_handling.h"
#include "third_party/blink/renderer/core/dom/css_toggle_map.h"
#include "third_party/blink/renderer/core/dom/dataset_dom_string_map.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/dom_token_list.h"
#include "third_party/blink/renderer/core/dom/element_data_cache.h"
#include "third_party/blink/renderer/core/dom/element_rare_data_vector.h"
#include "third_party/blink/renderer/core/dom/element_traversal.h"
#include "third_party/blink/renderer/core/dom/events/event_dispatch_forbidden_scope.h"
#include "third_party/blink/renderer/core/dom/events/event_dispatch_result.h"
#include "third_party/blink/renderer/core/dom/events/event_dispatcher.h"
#include "third_party/blink/renderer/core/dom/events/event_path.h"
#include "third_party/blink/renderer/core/dom/first_letter_pseudo_element.h"
#include "third_party/blink/renderer/core/dom/flat_tree_traversal.h"
#include "third_party/blink/renderer/core/dom/focus_params.h"
#include "third_party/blink/renderer/core/dom/layout_tree_builder.h"
#include "third_party/blink/renderer/core/dom/mutation_observer_interest_group.h"
#include "third_party/blink/renderer/core/dom/mutation_record.h"
#include "third_party/blink/renderer/core/dom/named_node_map.h"
#include "third_party/blink/renderer/core/dom/node_cloning_data.h"
#include "third_party/blink/renderer/core/dom/node_computed_style.h"
#include "third_party/blink/renderer/core/dom/presentation_attribute_style.h"
#include "third_party/blink/renderer/core/dom/pseudo_element.h"
#include "third_party/blink/renderer/core/dom/scriptable_document_parser.h"
#include "third_party/blink/renderer/core/dom/shadow_root.h"
#include "third_party/blink/renderer/core/dom/slot_assignment.h"
#include "third_party/blink/renderer/core/dom/space_split_string.h"
#include "third_party/blink/renderer/core/dom/text.h"
#include "third_party/blink/renderer/core/dom/whitespace_attacher.h"
#include "third_party/blink/renderer/core/editing/commands/undo_stack.h"
#include "third_party/blink/renderer/core/editing/editing_utilities.h"
#include "third_party/blink/renderer/core/editing/editor.h"
#include "third_party/blink/renderer/core/editing/ephemeral_range.h"
#include "third_party/blink/renderer/core/editing/frame_selection.h"
#include "third_party/blink/renderer/core/editing/ime/edit_context.h"
#include "third_party/blink/renderer/core/editing/ime/input_method_controller.h"
#include "third_party/blink/renderer/core/editing/selection_template.h"
#include "third_party/blink/renderer/core/editing/serializers/serialization.h"
#include "third_party/blink/renderer/core/editing/set_selection_options.h"
#include "third_party/blink/renderer/core/editing/visible_selection.h"
#include "third_party/blink/renderer/core/event_type_names.h"
#include "third_party/blink/renderer/core/events/focus_event.h"
#include "third_party/blink/renderer/core/events/keyboard_event.h"
#include "third_party/blink/renderer/core/execution_context/security_context.h"
#include "third_party/blink/renderer/core/frame/csp/content_security_policy.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/local_frame_view.h"
#include "third_party/blink/renderer/core/frame/settings.h"
#include "third_party/blink/renderer/core/frame/visual_viewport.h"
#include "third_party/blink/renderer/core/fullscreen/fullscreen.h"
#include "third_party/blink/renderer/core/geometry/dom_rect.h"
#include "third_party/blink/renderer/core/geometry/dom_rect_list.h"
#include "third_party/blink/renderer/core/html/anchor_element_observer.h"
#include "third_party/blink/renderer/core/html/canvas/html_canvas_element.h"
#include "third_party/blink/renderer/core/html/custom/custom_element.h"
#include "third_party/blink/renderer/core/html/custom/custom_element_registry.h"
#include "third_party/blink/renderer/core/html/forms/html_button_element.h"
#include "third_party/blink/renderer/core/html/forms/html_field_set_element.h"
#include "third_party/blink/renderer/core/html/forms/html_form_control_element.h"
#include "third_party/blink/renderer/core/html/forms/html_form_controls_collection.h"
#include "third_party/blink/renderer/core/html/forms/html_input_element.h"
#include "third_party/blink/renderer/core/html/forms/html_options_collection.h"
#include "third_party/blink/renderer/core/html/forms/html_select_element.h"
#include "third_party/blink/renderer/core/html/forms/html_select_menu_element.h"
#include "third_party/blink/renderer/core/html/html_anchor_element.h"
#include "third_party/blink/renderer/core/html/html_area_element.h"
#include "third_party/blink/renderer/core/html/html_body_element.h"
#include "third_party/blink/renderer/core/html/html_collection.h"
#include "third_party/blink/renderer/core/html/html_document.h"
#include "third_party/blink/renderer/core/html/html_element.h"
#include "third_party/blink/renderer/core/html/html_frame_element_base.h"
#include "third_party/blink/renderer/core/html/html_frame_owner_element.h"
#include "third_party/blink/renderer/core/html/html_html_element.h"
#include "third_party/blink/renderer/core/html/html_plugin_element.h"
#include "third_party/blink/renderer/core/html/html_quote_element.h"
#include "third_party/blink/renderer/core/html/html_slot_element.h"
#include "third_party/blink/renderer/core/html/html_table_rows_collection.h"
#include "third_party/blink/renderer/core/html/html_template_element.h"
#include "third_party/blink/renderer/core/html/nesting_level_incrementer.h"
#include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h"
#include "third_party/blink/renderer/core/html_element_type_helpers.h"
#include "third_party/blink/renderer/core/html_names.h"
#include "third_party/blink/renderer/core/input/event_handler.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/intersection_observer/element_intersection_observer_data.h"
#include "third_party/blink/renderer/core/intersection_observer/intersection_observer_controller.h"
#include "third_party/blink/renderer/core/keywords.h"
#include "third_party/blink/renderer/core/layout/adjust_for_absolute_zoom.h"
#include "third_party/blink/renderer/core/layout/layout_text_fragment.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/layout/ng/inline/layout_ng_text_combine.h"
#include "third_party/blink/renderer/core/layout/ng/ng_block_node.h"
#include "third_party/blink/renderer/core/page/chrome_client.h"
#include "third_party/blink/renderer/core/page/focus_controller.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/page/page_animator.h"
#include "third_party/blink/renderer/core/page/pointer_lock_controller.h"
#include "third_party/blink/renderer/core/page/scrolling/root_scroller_controller.h"
#include "third_party/blink/renderer/core/page/spatial_navigation.h"
#include "third_party/blink/renderer/core/paint/paint_layer.h"
#include "third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h"
#include "third_party/blink/renderer/core/probe/core_probes.h"
#include "third_party/blink/renderer/core/resize_observer/resize_observation.h"
#include "third_party/blink/renderer/core/scroll/scroll_into_view_util.h"
#include "third_party/blink/renderer/core/scroll/scrollable_area.h"
#include "third_party/blink/renderer/core/scroll/scrollbar_theme.h"
#include "third_party/blink/renderer/core/scroll/smooth_scroll_sequencer.h"
#include "third_party/blink/renderer/core/speculation_rules/document_speculation_rules.h"
#include "third_party/blink/renderer/core/style/computed_style_constants.h"
#include "third_party/blink/renderer/core/style/toggle_trigger.h"
#include "third_party/blink/renderer/core/style/toggle_trigger_list.h"
#include "third_party/blink/renderer/core/svg/svg_a_element.h"
#include "third_party/blink/renderer/core/svg/svg_animated_href.h"
#include "third_party/blink/renderer/core/svg/svg_element.h"
#include "third_party/blink/renderer/core/svg/svg_svg_element.h"
#include "third_party/blink/renderer/core/svg_names.h"
#include "third_party/blink/renderer/core/trustedtypes/trusted_types_util.h"
#include "third_party/blink/renderer/core/view_transition/view_transition_supplement.h"
#include "third_party/blink/renderer/core/view_transition/view_transition_utils.h"
#include "third_party/blink/renderer/core/xml_names.h"
#include "third_party/blink/renderer/platform/bindings/dom_data_store.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/bindings/v8_dom_activity_logger.h"
#include "third_party/blink/renderer/platform/bindings/v8_dom_wrapper.h"
#include "third_party/blink/renderer/platform/bindings/v8_per_context_data.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_set.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/thread_state.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
#include "third_party/blink/renderer/platform/language.h"
#include "third_party/blink/renderer/platform/region_capture_crop_id.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
#include "third_party/blink/renderer/platform/wtf/hash_functions.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
#include "third_party/blink/renderer/platform/wtf/text/text_position.h"
#include "ui/accessibility/ax_mode.h"
#include "ui/gfx/geometry/rect_conversions.h"
namespace blink {
enum class ClassStringContent { kEmpty, kWhiteSpaceOnly, kHasClasses };
namespace {
bool EarlyExitOnNoopClassOrStyleChange() {
static const bool is_enabled = base::FeatureList::IsEnabled(
features::kEarlyExitOnNoopClassOrStyleChange);
DCHECK_EQ(is_enabled, base::FeatureList::IsEnabled(
features::kEarlyExitOnNoopClassOrStyleChange));
return is_enabled;
}
class DisplayLockStyleScope {
STACK_ALLOCATED();
public:
explicit DisplayLockStyleScope(Element* element) : element_(element) {
// Note that we don't store context as a member of this scope, since it may
// get created as part of element self style recalc.
}
~DisplayLockStyleScope() {
if (auto* context = element_->GetDisplayLockContext()) {
if (did_update_children_) {
context->DidStyleChildren();
if (auto* document_rules = DocumentSpeculationRules::FromIfExists(
element_->GetDocument())) {
document_rules->DidStyleChildren(element_);
}
}
}
}
bool ShouldUpdateChildStyle() const {
// We can't calculate this on construction time, because the element's lock
// state may changes after self-style calculation ShouldStyle(children).
auto* context = element_->GetDisplayLockContext();
return !context || context->ShouldStyleChildren();
}
void DidUpdateChildStyle() { did_update_children_ = true; }
// Returns true if the element was force unlocked due to missing requirements.
StyleRecalcChange DidUpdateSelfStyle(StyleRecalcChange change) {
if (auto* context = element_->GetDisplayLockContext()) {
context->DidStyleSelf();
// After we notified context that we styled self, it may cause an unlock /
// modification to the blocked style change, so accumulate the change here
// again. Note that if the context is locked we will restore it as the
// blocked style change in RecalcStyle.
return change.Combine(context->TakeBlockedStyleRecalcChange());
}
return change;
}
void NotifyChildStyleRecalcWasBlocked(const StyleRecalcChange& change) {
DCHECK(!ShouldUpdateChildStyle());
// The only way to be blocked here is if we have a display lock context.
DCHECK(element_->GetDisplayLockContext());
element_->GetDisplayLockContext()->NotifyChildStyleRecalcWasBlocked(change);
if (auto* document_rules =
DocumentSpeculationRules::FromIfExists(element_->GetDocument())) {
document_rules->ChildStyleRecalcBlocked(element_);
}
}
private:
Element* element_;
bool did_update_children_ = false;
};
bool IsRootEditableElementWithCounting(const Element& element) {
bool is_editable = IsRootEditableElement(element);
Document& doc = element.GetDocument();
if (!doc.IsActive()) {
return is_editable;
}
// -webkit-user-modify doesn't affect text control elements.
if (element.IsTextControl()) {
return is_editable;
}
const auto* style = element.GetComputedStyle();
if (!style) {
return is_editable;
}
auto user_modify = style->UsedUserModify();
AtomicString ce_value =
element.FastGetAttribute(html_names::kContenteditableAttr).LowerASCII();
if (ce_value.IsNull() || ce_value == keywords::kFalse) {
if (user_modify == EUserModify::kReadWritePlaintextOnly) {
UseCounter::Count(doc, WebFeature::kPlainTextEditingEffective);
UseCounter::Count(doc, WebFeature::kWebKitUserModifyPlainTextEffective);
UseCounter::Count(doc, WebFeature::kWebKitUserModifyEffective);
} else if (user_modify == EUserModify::kReadWrite) {
UseCounter::Count(doc, WebFeature::kWebKitUserModifyReadWriteEffective);
UseCounter::Count(doc, WebFeature::kWebKitUserModifyEffective);
}
} else if (ce_value.empty() || ce_value == keywords::kTrue) {
if (user_modify == EUserModify::kReadWritePlaintextOnly) {
UseCounter::Count(doc, WebFeature::kPlainTextEditingEffective);
UseCounter::Count(doc, WebFeature::kWebKitUserModifyPlainTextEffective);
UseCounter::Count(doc, WebFeature::kWebKitUserModifyEffective);
} else if (user_modify == EUserModify::kReadOnly) {
UseCounter::Count(doc, WebFeature::kWebKitUserModifyReadOnlyEffective);
UseCounter::Count(doc, WebFeature::kWebKitUserModifyEffective);
}
} else if (ce_value == keywords::kPlaintextOnly) {
UseCounter::Count(doc, WebFeature::kPlainTextEditingEffective);
if (user_modify == EUserModify::kReadWrite) {
UseCounter::Count(doc, WebFeature::kWebKitUserModifyReadWriteEffective);
UseCounter::Count(doc, WebFeature::kWebKitUserModifyEffective);
} else if (user_modify == EUserModify::kReadOnly) {
UseCounter::Count(doc, WebFeature::kWebKitUserModifyReadOnlyEffective);
UseCounter::Count(doc, WebFeature::kWebKitUserModifyEffective);
}
}
return is_editable;
}
bool HasLeftwardDirection(const Element& element) {
auto* style = element.GetComputedStyle();
if (!style) {
return false;
}
WritingMode writing_mode = style->GetWritingMode();
bool is_rtl = !style->IsLeftToRightDirection();
return (writing_mode == WritingMode::kHorizontalTb && is_rtl) ||
writing_mode == WritingMode::kVerticalRl ||
writing_mode == WritingMode::kSidewaysRl;
}
bool HasUpwardDirection(const Element& element) {
auto* style = element.GetComputedStyle();
if (!style) {
return false;
}
WritingMode writing_mode = style->GetWritingMode();
bool is_rtl = !style->IsLeftToRightDirection();
return (is_rtl && (writing_mode == WritingMode::kVerticalRl ||
writing_mode == WritingMode::kVerticalLr ||
writing_mode == WritingMode::kSidewaysRl)) ||
(!is_rtl && writing_mode == WritingMode::kSidewaysLr);
}
// TODO(meredithl): Automatically generate this method once the IDL compiler has
// been refactored. See http://crbug.com/839389 for details.
bool IsElementReflectionAttribute(const QualifiedName& name) {
if (name == html_names::kAriaActivedescendantAttr) {
return true;
}
if (name == html_names::kAriaControlsAttr) {
return true;
}
if (name == html_names::kAriaDescribedbyAttr) {
return true;
}
if (name == html_names::kAriaDetailsAttr) {
return true;
}
if (name == html_names::kAriaErrormessageAttr) {
return true;
}
if (name == html_names::kAriaFlowtoAttr) {
return true;
}
if (name == html_names::kAriaLabeledbyAttr) {
return true;
}
if (name == html_names::kAriaLabelledbyAttr) {
return true;
}
if (name == html_names::kAriaOwnsAttr) {
return true;
}
return false;
}
HeapLinkedHashSet<WeakMember<Element>>* GetExplicitlySetElementsForAttr(
Element* element,
const QualifiedName& name) {
ExplicitlySetAttrElementsMap* element_attribute_map =
element->GetDocument().GetExplicitlySetAttrElementsMap(element);
auto it = element_attribute_map->find(name);
if (it == element_attribute_map->end()) {
return nullptr;
}
const auto& elements = it->value;
return elements->size() ? elements : nullptr;
}
// Checks that the given element |candidate| is a descendant of
// |attribute_element|'s shadow including ancestors.
bool ElementIsDescendantOfShadowIncludingAncestor(
const Element& attribute_element,
const Element& candidate) {
auto* candidate_root = &candidate.TreeRoot();
auto* element_root = &attribute_element.TreeRoot();
while (true) {
if (candidate_root == element_root) {
return true;
}
if (!element_root->IsInShadowTree()) {
return false;
}
element_root = &element_root->OwnerShadowHost()->TreeRoot();
}
}
// The first algorithm in
// https://html.spec.whatwg.org/C/#the-autofocus-attribute
void EnqueueAutofocus(Element& element) {
// When an element with the autofocus attribute specified is inserted into a
// document, run the following steps:
DCHECK(element.isConnected());
if (!element.IsAutofocusable()) {
return;
}
// 1. If the user has indicated (for example, by starting to type in a form
// control) that they do not wish focus to be changed, then optionally return.
// We don't implement this optional step. If other browsers have such
// behavior, we should follow it or standardize it.
// 2. Let target be the element's node document.
Document& doc = element.GetDocument();
LocalDOMWindow* window = doc.domWindow();
// 3. If target's browsing context is null, then return.
if (!window) {
return;
}
// 4. If target's active sandboxing flag set has the sandboxed automatic
// features browsing context flag, then return.
if (window->IsSandboxed(
network::mojom::blink::WebSandboxFlags::kAutomaticFeatures)) {
window->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kSecurity,
mojom::ConsoleMessageLevel::kError,
String::Format(
"Blocked autofocusing on a <%s> element because the element's "
"frame "
"is sandboxed and the 'allow-scripts' permission is not set.",
element.TagQName().ToString().Ascii().c_str())));
return;
}
// 5. For each ancestorBC of target's browsing context's ancestor browsing
// contexts: if ancestorBC's active document's origin is not same origin with
// target's origin, then return.
for (Frame* frame = doc.GetFrame(); frame; frame = frame->Parent()) {
if (!frame->IsCrossOriginToOutermostMainFrame()) {
continue;
}
window->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kSecurity,
mojom::ConsoleMessageLevel::kError,
String::Format("Blocked autofocusing on a <%s> element in a "
"cross-origin subframe.",
element.TagQName().ToString().Ascii().c_str())));
return;
}
// 6. Let topDocument be the active document of target's browsing context's
// top-level browsing context.
Document& top_document = element.GetDocument().TopDocument();
top_document.EnqueueAutofocusCandidate(element);
}
bool WillUpdateSizeContainerDuringLayout(const LayoutObject& layout_object) {
// When a size-container LayoutObject is marked as needs layout,
// NGBlockNode::Layout() will resume style recalc with an up-to-date size in
// StyleEngine::UpdateStyleAndLayoutTreeForContainer().
return layout_object.SelfNeedsLayout() &&
layout_object.IsEligibleForSizeContainment();
}
bool IsValidShadowHostName(const QualifiedName& tag_name) {
DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, shadow_root_tags,
({
html_names::kArticleTag,
html_names::kAsideTag,
html_names::kBlockquoteTag,
html_names::kBodyTag,
html_names::kDivTag,
html_names::kFooterTag,
html_names::kH1Tag,
html_names::kH2Tag,
html_names::kH3Tag,
html_names::kH4Tag,
html_names::kH5Tag,
html_names::kH6Tag,
html_names::kHeaderTag,
html_names::kNavTag,
html_names::kMainTag,
html_names::kPTag,
html_names::kSectionTag,
html_names::kSpanTag,
}));
return shadow_root_tags.Contains(tag_name);
}
} // namespace
Element::Element(const QualifiedName& tag_name,
Document* document,
ConstructionType type)
: ContainerNode(document, type), tag_name_(tag_name) {}
Element* Element::GetAnimationTarget() {
return this;
}
bool Element::HasElementFlagInternal(ElementFlags mask) const {
return GetElementRareData()->HasElementFlag(mask);
}
void Element::SetElementFlag(ElementFlags mask, bool value) {
if (!HasRareData() && !value) {
return;
}
EnsureElementRareData().SetElementFlag(mask, value);
}
void Element::ClearElementFlag(ElementFlags mask) {
if (!HasRareData()) {
return;
}
GetElementRareData()->ClearElementFlag(mask);
}
void Element::ClearTabIndexExplicitlyIfNeeded() {
if (HasRareData()) {
GetElementRareData()->ClearTabIndexExplicitly();
}
}
void Element::SetTabIndexExplicitly() {
EnsureElementRareData().SetTabIndexExplicitly();
}
void Element::setTabIndex(int value) {
SetIntegralAttribute(html_names::kTabindexAttr, value);
}
int Element::tabIndex() const {
// https://html.spec.whatwg.org/C/#dom-tabindex
// The tabIndex IDL attribute must reflect the value of the tabindex content
// attribute. The default value is 0 if the element is an a, area, button,
// frame, iframe, input, object, select, textarea, or SVG a element, or is a
// summary element that is a summary for its parent details. The default value
// is −1 otherwise.
return GetIntegralAttribute(html_names::kTabindexAttr, DefaultTabIndex());
}
int Element::DefaultTabIndex() const {
return -1;
}
bool Element::IsFocusableStyle() const {
// TODO(vmpstr): Note that this may be called by accessibility during layout
// tree attachment, at which point we might not have cleared all of the dirty
// bits to ensure that the layout tree doesn't need an update. This should be
// fixable by deferring AX tree updates as a separate phase after layout tree
// attachment has happened. At that point `InStyleRecalc()` portion of the
// following DCHECK can be removed.
DCHECK(
!GetDocument().IsActive() || GetDocument().InStyleRecalc() ||
!GetDocument().NeedsLayoutTreeUpdateForNodeIncludingDisplayLocked(*this));
return IsBaseElementFocusableStyle();
}
bool Element::IsBaseElementFocusableStyle() const {
if (LayoutObject* layout_object = GetLayoutObject()) {
return layout_object->StyleRef().IsFocusable();
}
// If a canvas represents embedded content, its descendants are not rendered.
// But they are still allowed to be focusable as long as their style allows
// focus, their canvas is rendered, and its style allows focus.
if (IsInCanvasSubtree()) {
const ComputedStyle* style = GetComputedStyle();
if (!style || !style->IsFocusable()) {
return false;
}
const HTMLCanvasElement* canvas =
Traversal<HTMLCanvasElement>::FirstAncestorOrSelf(*this);
DCHECK(canvas);
if (LayoutObject* layout_object = canvas->GetLayoutObject()) {
return layout_object->IsCanvas() &&
layout_object->StyleRef().IsFocusable();
}
}
return false;
}
Node* Element::Clone(Document& factory,
NodeCloningData& data,
ContainerNode* append_to,
ExceptionState& append_exception_state) const {
if (!data.Has(CloneOption::kIncludeDescendants)) {
CHECK(!data.Has(CloneOption::kIncludeShadowRoots));
Element* copy = &CloneWithoutChildren(data, &factory);
if (append_to) {
append_to->AppendChild(copy, append_exception_state);
}
return copy;
}
Element* copy =
&CloneWithChildren(data, &factory, append_to, append_exception_state);
// 7. If node is a shadow host and the clone shadows flag is set, run these
// steps:
if (data.Has(CloneOption::kIncludeShadowRoots)) {
auto* shadow_root = GetShadowRoot();
if (shadow_root && (shadow_root->GetType() == ShadowRootType::kOpen ||
shadow_root->GetType() == ShadowRootType::kClosed)) {
// 7.1 Run attach a shadow root with shadow host equal to copy, mode equal
// to node’s shadow root’s mode, and delegates focus equal to node’s
// shadow root’s delegates focus.
ShadowRoot& cloned_shadow_root = copy->AttachShadowRootInternal(
shadow_root->GetType(),
shadow_root->delegatesFocus() ? FocusDelegation::kDelegateFocus
: FocusDelegation::kNone,
shadow_root->GetSlotAssignmentMode());
// 7.2 If node’s shadow root’s "is declarative shadow root" is true, then
// set copy’s shadow root’s "is declarative shadow root" property to true.
cloned_shadow_root.SetIsDeclarativeShadowRoot(
shadow_root->IsDeclarativeShadowRoot());
// 7.NEW If node’s shadow root’s "is available to element internals" is
// true, then set copy’s shadow root’s "is available to element internals"
// property to true.
cloned_shadow_root.SetAvailableToElementInternals(
shadow_root->IsAvailableToElementInternals());
// 7.3 If the clone children flag is set, clone all the children of node’s
// shadow root and append them to copy’s shadow root, with document as
// specified, the clone children flag being set, and the clone shadows
// flag being set.
cloned_shadow_root.CloneChildNodesFrom(*shadow_root, data);
}
}
return copy;
}
Element& Element::CloneWithChildren(
NodeCloningData& data,
Document* nullable_factory,
ContainerNode* append_to,
ExceptionState& append_exception_state) const {
Element& clone = CloneWithoutAttributesAndChildren(
nullable_factory ? *nullable_factory : GetDocument());
// This will catch HTML elements in the wrong namespace that are not correctly
// copied. This is a sanity check as HTML overloads some of the DOM methods.
DCHECK_EQ(IsHTMLElement(), clone.IsHTMLElement());
clone.CloneAttributesFrom(*this);
clone.CloneNonAttributePropertiesFrom(*this, data);
clone.ClonePartsFrom(*this, data);
// - (With OptimizedNodeCloneOrder enabled) Append the clone to its parent
// first, before cloning children. If this is done in the reverse order,
// each new child will receive treeDepth calls to Node::InsertedInto().
// - (With OptimizedNodeCloneOrder DISABLED) Clone children first, then append
// them.
if (!RuntimeEnabledFeatures::OptimizedNodeCloneOrderEnabled()) {
clone.CloneChildNodesFrom(*this, data);
}
if (append_to) {
append_to->AppendChild(&clone, append_exception_state);
}
if (RuntimeEnabledFeatures::OptimizedNodeCloneOrderEnabled()) {
clone.CloneChildNodesFrom(*this, data);
}
return clone;
}
Element& Element::CloneWithoutChildren() const {
NodeCloningData data;
return CloneWithoutChildren(data);
}
Element& Element::CloneWithoutChildren(NodeCloningData& data,
Document* nullable_factory) const {
Element& clone = CloneWithoutAttributesAndChildren(
nullable_factory ? *nullable_factory : GetDocument());
// This will catch HTML elements in the wrong namespace that are not correctly
// copied. This is a sanity check as HTML overloads some of the DOM methods.
DCHECK_EQ(IsHTMLElement(), clone.IsHTMLElement());
clone.CloneAttributesFrom(*this);
clone.CloneNonAttributePropertiesFrom(*this, data);
clone.ClonePartsFrom(*this, data);
return clone;
}
Element& Element::CloneWithoutAttributesAndChildren(Document& factory) const {
return *factory.CreateElement(TagQName(), CreateElementFlags::ByCloneNode(),
IsValue());
}
Attr* Element::DetachAttribute(wtf_size_t index) {
DCHECK(HasElementData());
const Attribute& attribute = GetElementData()->Attributes().at(index);
Attr* attr_node = AttrIfExists(attribute.GetName());
if (attr_node) {
DetachAttrNodeAtIndex(attr_node, index);
} else {
attr_node = MakeGarbageCollected<Attr>(GetDocument(), attribute.GetName(),
attribute.Value());
RemoveAttributeInternal(index, AttributeModificationReason::kDirectly);
}
return attr_node;
}
void Element::DetachAttrNodeAtIndex(Attr* attr, wtf_size_t index) {
DCHECK(attr);
DCHECK(HasElementData());
const Attribute& attribute = GetElementData()->Attributes().at(index);
DCHECK(attribute.GetName() == attr->GetQualifiedName());
DetachAttrNodeFromElementWithValue(attr, attribute.Value());
RemoveAttributeInternal(index, AttributeModificationReason::kDirectly);
}
void Element::removeAttribute(const QualifiedName& name) {
wtf_size_t index = FindAttributeIndex(name);
if (index == kNotFound) {
return;
}
RemoveAttributeInternal(index, AttributeModificationReason::kDirectly);
}
void Element::SetBooleanAttribute(const QualifiedName& name, bool value) {
if (value) {
setAttribute(name, g_empty_atom);
} else {
removeAttribute(name);
}
}
bool Element::HasExplicitlySetAttrAssociatedElements(
const QualifiedName& name) {
return GetExplicitlySetElementsForAttr(this, name);
}
void Element::SynchronizeContentAttributeAndElementReference(
const QualifiedName& name) {
ExplicitlySetAttrElementsMap* element_attribute_map =
GetDocument().GetExplicitlySetAttrElementsMap(this);
element_attribute_map->erase(name);
}
void Element::SetElementAttribute(const QualifiedName& name, Element* element) {
ExplicitlySetAttrElementsMap* explicitly_set_attr_elements_map =
GetDocument().GetExplicitlySetAttrElementsMap(this);
// If the reflected element is explicitly null then we remove the content
// attribute and the explicitly set attr-element.
if (!element) {
explicitly_set_attr_elements_map->erase(name);
removeAttribute(name);
return;
}
setAttribute(name, g_empty_atom);
auto result = explicitly_set_attr_elements_map->insert(name, nullptr);
if (result.is_new_entry) {
result.stored_value->value =
MakeGarbageCollected<HeapLinkedHashSet<WeakMember<Element>>>();
} else {
result.stored_value->value->clear();
}
result.stored_value->value->insert(element);
if (isConnected()) {
if (AXObjectCache* cache = GetDocument().ExistingAXObjectCache()) {
cache->HandleAttributeChanged(name, this);
}
}
}
namespace {
Element* getElementByIdIncludingDisconnected(const Element& element,
AtomicString id) {
if (element.isConnected()) {
return element.GetTreeScope().getElementById(id);
}
// https://html.spec.whatwg.org/#attr-associated-element
// Attr associated element lookup does not depend on whether the element
// is connected. However, the TreeOrderedMap that is used for
// TreeScope::getElementById() only stores connected elements.
Node& root = element.TreeRoot();
for (Element& el : ElementTraversal::DescendantsOf(root)) {
if (el.GetIdAttribute() == id) {
return ⪙
}
}
return nullptr;
}
} // namespace
Element* Element::GetElementAttribute(const QualifiedName& name) {
HeapLinkedHashSet<WeakMember<Element>>* element_attribute_vector =
GetExplicitlySetElementsForAttr(this, name);
if (element_attribute_vector) {
DCHECK_EQ(element_attribute_vector->size(), 1u);
Element* explicitly_set_element = *(element_attribute_vector->begin());
DCHECK_NE(explicitly_set_element, nullptr);
// Only return the explicit element if it still exists within a valid scope.
if (!ElementIsDescendantOfShadowIncludingAncestor(
*this, *explicitly_set_element)) {
return nullptr;
}
return explicitly_set_element;
}
// Compute the attr-associated element from the content attribute if present,
// id can be null.
AtomicString id = getAttribute(name);
if (id.IsNull()) {
return nullptr;
}
// Will return null if the id is empty.
return getElementByIdIncludingDisconnected(*this, id);
}
void Element::SetElementArrayAttribute(
const QualifiedName& name,
const HeapVector<Member<Element>>* given_elements) {
ExplicitlySetAttrElementsMap* element_attribute_map =
GetDocument().GetExplicitlySetAttrElementsMap(this);
if (!given_elements) {
element_attribute_map->erase(name);
removeAttribute(name);
return;
}
setAttribute(name, g_empty_atom);
// Get or create element array, and remove any pre-existing elements.
//
// Note that this code intentionally performs two look ups on |name| within
// the map (one here, and one below with a call to |Set|).
// This is needed as modifying the content attribute (|setAttribute|) will
// run the synchronization steps which modify the map invalidating any
// outstanding iterators.
auto it = element_attribute_map->find(name);
HeapLinkedHashSet<WeakMember<Element>>* stored_elements =
it != element_attribute_map->end() ? it->value : nullptr;
if (!stored_elements) {
stored_elements =
MakeGarbageCollected<HeapLinkedHashSet<WeakMember<Element>>>();
} else {
stored_elements->clear();
}
for (auto element : *given_elements) {
stored_elements->insert(element);
}
if (isConnected()) {
if (AXObjectCache* cache = GetDocument().ExistingAXObjectCache()) {
cache->HandleAttributeChanged(name, this);
}
}
// This |Set| call must occur after our call to |setAttribute| above.
//
// |setAttribute| will call through to |AttributeChanged| which calls
// |SynchronizeContentAttributeAndElementReference| erasing the entry for
// |name| from the map.
element_attribute_map->Set(name, stored_elements);
}
HeapVector<Member<Element>>* Element::GetElementArrayAttribute(
const QualifiedName& name) {
HeapVector<Member<Element>>* result_elements =
MakeGarbageCollected<HeapVector<Member<Element>>>();
// TODO(chrishall): this will fail to preserve `e1.ariaFoo === e1.ariaFoo`,
// need additional cache to preserve this invariant, add tests covering this
// case.
HeapLinkedHashSet<WeakMember<Element>>* explicitly_set_elements =
GetExplicitlySetElementsForAttr(this, name);
if (explicitly_set_elements) {
for (auto attrElement : *explicitly_set_elements) {
if (ElementIsDescendantOfShadowIncludingAncestor(*this, *attrElement)) {
result_elements->push_back(attrElement);
}
}
return result_elements;
}
QualifiedName attr = name;
// Account for labelled vs labeled spelling
if (attr == html_names::kAriaLabelledbyAttr) {
attr = hasAttribute(html_names::kAriaLabeledbyAttr) &&
!hasAttribute(html_names::kAriaLabelledbyAttr)
? html_names::kAriaLabeledbyAttr
: html_names::kAriaLabelledbyAttr;
}
if (!hasAttribute(attr)) {
return nullptr;
}
String attribute_value = getAttribute(attr).GetString();
Vector<String> tokens;
attribute_value = attribute_value.SimplifyWhiteSpace();
attribute_value.Split(' ', tokens);
// Lookup each id within the same root.
// Since this is based on ID we know it cannot cross shadow boundaries, so we
// don't need to include additional logic to check that.
for (auto id : tokens) {
Element* candidate =
getElementByIdIncludingDisconnected(*this, AtomicString(id));
if (candidate) {
result_elements->push_back(candidate);
}
}
return result_elements;
}
NamedNodeMap* Element::attributesForBindings() const {
ElementRareDataVector& rare_data =
const_cast<Element*>(this)->EnsureElementRareData();
if (NamedNodeMap* attribute_map = rare_data.AttributeMap()) {
return attribute_map;
}
rare_data.SetAttributeMap(
MakeGarbageCollected<NamedNodeMap>(const_cast<Element*>(this)));
return rare_data.AttributeMap();
}
Vector<AtomicString> Element::getAttributeNames() const {
Vector<AtomicString> attributesVector;
if (!hasAttributes()) {
return attributesVector;
}
AttributeCollection attributes = element_data_->Attributes();
attributesVector.ReserveInitialCapacity(attributes.size());
for (const Attribute& attr : attributes) {
attributesVector.UncheckedAppend(attr.GetName().ToString());
}
return attributesVector;
}
inline ElementRareDataVector* Element::GetElementRareData() const {
DCHECK(HasRareData());
return static_cast<ElementRareDataVector*>(RareData());
}