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Implement shadow dom slots (#35013)

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* Implement slot-related algorithms

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Hook up slot elements to DOM creation logic

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Set a slot assignment mode for servo-internal shadow roots

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Assign slots when a slottable's slot attribute changes

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Properly compute slot name

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* ./mach test-tidy

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Update <slot> name when name attribute changes

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Implement fast path for Node::assign_slottables_for_a_tree

assign_slottables_for_a_tree traverses all descendants of the node
and is potentially very expensive. If the node is not a shadow root
then assigning slottables to it won't have any effect, so we
take a fast path out.

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Move slottable data into ElementRareData

This shrinks all element descendants back to their
original size.

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Address review comments

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Update WPT expectations

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
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Simon Wülker 2025-01-19 15:05:05 +01:00 • committed by GitHub
parent 8bb50fa3c9
commit dabe162d44
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31 changed files with 758 additions and 355 deletions
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components/script/dom/webidls/HTMLSlotElement.webidl Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
// https://html.spec.whatwg.org/multipage/#the-slot-element
[Exposed=Window]
interface HTMLSlotElement : HTMLElement {
[HTMLConstructor] constructor();
[CEReactions] attribute DOMString name;
sequence<Node> assignedNodes(optional AssignedNodesOptions options = {});
sequence<Element> assignedElements(optional AssignedNodesOptions options = {});
undefined assign((Element or Text)... nodes);
};
dictionary AssignedNodesOptions {
boolean flatten = false;
};
// https://dom.spec.whatwg.org/#mixin-slotable
interface mixin Slottable {
readonly attribute HTMLSlotElement? assignedSlot;
};
Element includes Slottable;
Text includes Slottable;