mirror of
https://github.com/servo/servo.git
synced 2025-06-06 16:45:39 +00:00
349edff768
This also removes the meta viewport support (which was implemented on top), but that also had a single test and is disabled everywhere, so I'm not too concerned, it can be implemented again if / when needed.
638 lines
18 KiB
Rust
638 lines
18 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! The implementation of the DOM.
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//!
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//! The DOM is comprised of interfaces (defined by specifications using
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//! [WebIDL](https://heycam.github.io/webidl/)) that are implemented as Rust
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//! structs in submodules of this module. Its implementation is documented
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//! below.
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//!
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//! A DOM object and its reflector
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//! ==============================
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//!
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//! The implementation of an interface `Foo` in Servo's DOM involves two
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//! related but distinct objects:
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//!
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//! * the **DOM object**: an instance of the Rust struct `dom::foo::Foo`
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//! (marked with the `#[dom_struct]` attribute) on the Rust heap;
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//! * the **reflector**: a `JSObject` allocated by SpiderMonkey, that owns the
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//! DOM object.
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//!
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//! Memory management
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//! =================
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//!
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//! Reflectors of DOM objects, and thus the DOM objects themselves, are managed
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//! by the SpiderMonkey Garbage Collector. Thus, keeping alive a DOM object
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//! is done through its reflector.
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//!
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//! For more information, see:
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//!
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//! * rooting pointers on the stack:
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//! the [`Root`](bindings/root/struct.Root.html) smart pointer;
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//! * tracing pointers in member fields: the [`Dom`](bindings/root/struct.Dom.html),
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//! [`MutNullableDom`](bindings/root/struct.MutNullableDom.html) and
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//! [`MutDom`](bindings/root/struct.MutDom.html) smart pointers and
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//! [the tracing implementation](bindings/trace/index.html);
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//! * rooting pointers from across thread boundaries or in channels: the
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//! [`Trusted`](bindings/refcounted/struct.Trusted.html) smart pointer;
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//!
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//! Inheritance
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//! ===========
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//!
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//! Rust does not support struct inheritance, as would be used for the
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//! object-oriented DOM APIs. To work around this issue, Servo stores an
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//! instance of the superclass in the first field of its subclasses. (Note that
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//! it is stored by value, rather than in a smart pointer such as `Dom<T>`.)
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//!
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//! This implies that a pointer to an object can safely be cast to a pointer
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//! to all its classes.
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//!
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//! This invariant is enforced by the lint in
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//! `plugins::lints::inheritance_integrity`.
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//!
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//! Interfaces which either derive from or are derived by other interfaces
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//! implement the `Castable` trait, which provides three methods `is::<T>()`,
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//! `downcast::<T>()` and `upcast::<T>()` to cast across the type hierarchy
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//! and check whether a given instance is of a given type.
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//!
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//! ```ignore
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//! use dom::bindings::inheritance::Castable;
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//! use dom::element::Element;
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//! use dom::htmlelement::HTMLElement;
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//! use dom::htmlinputelement::HTMLInputElement;
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//!
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//! if let Some(elem) = node.downcast::<Element> {
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//! if elem.is::<HTMLInputElement>() {
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//! return elem.upcast::<HTMLElement>();
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//! }
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//! }
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//! ```
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//!
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//! Furthermore, when discriminating a given instance against multiple
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//! interface types, code generation provides a convenient TypeId enum
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//! which can be used to write `match` expressions instead of multiple
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//! calls to `Castable::is::<T>`. The `type_id()` method of an instance is
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//! provided by the farthest interface it derives from, e.g. `EventTarget`
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//! for `HTMLMediaElement`. For convenience, that method is also provided
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//! on the `Node` interface to avoid unnecessary upcasts to `EventTarget`.
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//!
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//! ```ignore
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//! use dom::bindings::inheritance::{EventTargetTypeId, NodeTypeId};
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//!
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//! match *node.type_id() {
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//! EventTargetTypeId::Node(NodeTypeId::CharacterData(_)) => ...,
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//! EventTargetTypeId::Node(NodeTypeId::Element(_)) => ...,
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//! ...,
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//! }
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//! ```
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//!
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//! Construction
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//! ============
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//!
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//! DOM objects of type `T` in Servo have two constructors:
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//!
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//! * a `T::new_inherited` static method that returns a plain `T`, and
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//! * a `T::new` static method that returns `DomRoot<T>`.
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//!
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//! (The result of either method can be wrapped in `Result`, if that is
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//! appropriate for the type in question.)
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//!
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//! The latter calls the former, boxes the result, and creates a reflector
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//! corresponding to it by calling `dom::bindings::utils::reflect_dom_object`
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//! (which yields ownership of the object to the SpiderMonkey Garbage Collector).
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//! This is the API to use when creating a DOM object.
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//!
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//! The former should only be called by the latter, and by subclasses'
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//! `new_inherited` methods.
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//!
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//! DOM object constructors in JavaScript correspond to a `T::Constructor`
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//! static method. This method is always fallible.
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//!
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//! Destruction
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//! ===========
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//!
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//! When the SpiderMonkey Garbage Collector discovers that the reflector of a
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//! DOM object is garbage, it calls the reflector's finalization hook. This
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//! function deletes the reflector's DOM object, calling its destructor in the
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//! process.
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//!
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//! Mutability and aliasing
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//! =======================
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//!
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//! Reflectors are JavaScript objects, and as such can be freely aliased. As
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//! Rust does not allow mutable aliasing, mutable borrows of DOM objects are
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//! not allowed. In particular, any mutable fields use `Cell` or `DomRefCell`
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//! to manage their mutability.
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//!
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//! `Reflector` and `DomObject`
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//! =============================
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//!
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//! Every DOM object has a `Reflector` as its first (transitive) member field.
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//! This contains a `*mut JSObject` that points to its reflector.
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//!
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//! The `FooBinding::Wrap` function creates the reflector, stores a pointer to
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//! the DOM object in the reflector, and initializes the pointer to the reflector
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//! in the `Reflector` field.
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//!
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//! The `DomObject` trait provides a `reflector()` method that returns the
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//! DOM object's `Reflector`. It is implemented automatically for DOM structs
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//! through the `#[dom_struct]` attribute.
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//!
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//! Implementing methods for a DOM object
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//! =====================================
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//!
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//! * `dom::bindings::codegen::Bindings::FooBindings::FooMethods` for methods
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//! defined through IDL;
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//! * `&self` public methods for public helpers;
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//! * `&self` methods for private helpers.
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//!
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//! Accessing fields of a DOM object
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//! ================================
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//!
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//! All fields of DOM objects are private; accessing them from outside their
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//! module is done through explicit getter or setter methods.
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//!
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//! Inheritance and casting
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//! =======================
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//!
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//! All DOM interfaces part of an inheritance chain (i.e. interfaces
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//! that derive others or are derived from) implement the trait `Castable`
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//! which provides both downcast and upcasts.
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//!
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//! ```ignore
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//! # use script::dom::bindings::inheritance::Castable;
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//! # use script::dom::element::Element;
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//! # use script::dom::node::Node;
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//! # use script::dom::htmlelement::HTMLElement;
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//! fn f(element: &Element) {
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//! let base = element.upcast::<Node>();
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//! let derived = element.downcast::<HTMLElement>().unwrap();
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//! }
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//! ```
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//!
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//! Adding a new DOM interface
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//! ==========================
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//!
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//! Adding a new interface `Foo` requires at least the following:
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//!
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//! * adding the new IDL file at `components/script/dom/webidls/Foo.webidl`;
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//! * creating `components/script/dom/foo.rs`;
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//! * listing `foo.rs` in `components/script/dom/mod.rs`;
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//! * defining the DOM struct `Foo` with a `#[dom_struct]` attribute, a
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//! superclass or `Reflector` member, and other members as appropriate;
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//! * implementing the
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//! `dom::bindings::codegen::Bindings::FooBindings::FooMethods` trait for
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//! `Foo`;
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//! * adding/updating the match arm in create_element in
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//! `components/script/dom/create.rs` (only applicable to new types inheriting
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//! from `HTMLElement`)
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//!
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//! More information is available in the [bindings module](bindings/index.html).
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//!
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//! Accessing DOM objects from layout
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//! =================================
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//!
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//! Layout code can access the DOM through the
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//! [`LayoutDom`](bindings/root/struct.LayoutDom.html) smart pointer. This does not
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//! keep the DOM object alive; we ensure that no DOM code (Garbage Collection
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//! in particular) runs while the layout thread is accessing the DOM.
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//!
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//! Methods accessible to layout are implemented on `LayoutDom<Foo>` using
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//! `LayoutFooHelpers` traits.
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#[macro_use]
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pub mod macros;
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pub mod types {
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include!(concat!(env!("OUT_DIR"), "/InterfaceTypes.rs"));
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}
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pub mod abstractworker;
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pub mod abstractworkerglobalscope;
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pub mod activation;
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pub mod analysernode;
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pub mod animationevent;
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pub mod attr;
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pub mod audiobuffer;
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pub mod audiobuffersourcenode;
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pub mod audiocontext;
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pub mod audiodestinationnode;
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pub mod audiolistener;
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pub mod audionode;
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pub mod audioparam;
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pub mod audioscheduledsourcenode;
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pub mod audiotrack;
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pub mod audiotracklist;
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pub mod baseaudiocontext;
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pub mod beforeunloadevent;
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pub mod bindings;
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pub mod biquadfilternode;
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pub mod blob;
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pub mod bluetooth;
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pub mod bluetoothadvertisingevent;
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pub mod bluetoothcharacteristicproperties;
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pub mod bluetoothdevice;
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pub mod bluetoothpermissionresult;
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pub mod bluetoothremotegattcharacteristic;
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pub mod bluetoothremotegattdescriptor;
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pub mod bluetoothremotegattserver;
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pub mod bluetoothremotegattservice;
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pub mod bluetoothuuid;
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pub mod broadcastchannel;
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pub mod canvasgradient;
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pub mod canvaspattern;
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pub mod canvasrenderingcontext2d;
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pub mod cdatasection;
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pub mod channelmergernode;
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pub mod channelsplitternode;
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pub mod characterdata;
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pub mod client;
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pub mod closeevent;
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pub mod comment;
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pub mod compositionevent;
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pub mod console;
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pub mod constantsourcenode;
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mod create;
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pub mod crypto;
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pub mod css;
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pub mod cssconditionrule;
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pub mod cssfontfacerule;
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pub mod cssgroupingrule;
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pub mod cssimportrule;
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pub mod csskeyframerule;
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pub mod csskeyframesrule;
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pub mod cssmediarule;
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pub mod cssnamespacerule;
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pub mod cssrule;
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pub mod cssrulelist;
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pub mod cssstyledeclaration;
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pub mod cssstylerule;
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pub mod cssstylesheet;
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pub mod cssstylevalue;
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pub mod csssupportsrule;
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pub mod customelementregistry;
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pub mod customevent;
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pub mod dedicatedworkerglobalscope;
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pub mod dissimilaroriginlocation;
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pub mod dissimilaroriginwindow;
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pub mod document;
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pub mod documentfragment;
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pub mod documentorshadowroot;
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pub mod documenttype;
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pub mod domexception;
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pub mod domimplementation;
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pub mod dommatrix;
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pub mod dommatrixreadonly;
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pub mod domparser;
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pub mod dompoint;
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pub mod dompointreadonly;
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pub mod domquad;
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pub mod domrect;
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pub mod domrectreadonly;
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pub mod domstringlist;
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pub mod domstringmap;
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pub mod domtokenlist;
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pub mod dynamicmoduleowner;
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pub mod element;
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pub mod errorevent;
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pub mod event;
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pub mod eventsource;
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pub mod eventtarget;
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pub mod extendableevent;
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pub mod extendablemessageevent;
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pub mod fakexrdevice;
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pub mod fakexrinputcontroller;
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pub mod file;
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pub mod filelist;
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pub mod filereader;
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pub mod filereadersync;
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pub mod focusevent;
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pub mod formdata;
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pub mod formdataevent;
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pub mod gainnode;
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pub mod gamepad;
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pub mod gamepadbutton;
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pub mod gamepadbuttonlist;
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pub mod gamepadevent;
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pub mod gamepadlist;
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pub mod gamepadpose;
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pub mod globalscope;
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pub mod gpu;
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pub mod gpuadapter;
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pub mod gpubindgroup;
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pub mod gpubindgrouplayout;
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pub mod gpubuffer;
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pub mod gpubufferusage;
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pub mod gpucanvascontext;
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pub mod gpucolorwrite;
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pub mod gpucommandbuffer;
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pub mod gpucommandencoder;
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pub mod gpucomputepassencoder;
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pub mod gpucomputepipeline;
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pub mod gpudevice;
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pub mod gpudevicelostinfo;
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pub mod gpumapmode;
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pub mod gpuoutofmemoryerror;
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pub mod gpupipelinelayout;
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pub mod gpuqueue;
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pub mod gpurenderbundle;
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pub mod gpurenderbundleencoder;
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pub mod gpurenderpassencoder;
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pub mod gpurenderpipeline;
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pub mod gpusampler;
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pub mod gpushadermodule;
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pub mod gpushaderstage;
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pub mod gpuswapchain;
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pub mod gputexture;
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pub mod gputextureusage;
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pub mod gputextureview;
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pub mod gpuuncapturederrorevent;
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pub mod gpuvalidationerror;
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pub mod hashchangeevent;
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pub mod headers;
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pub mod history;
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pub mod htmlanchorelement;
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pub mod htmlareaelement;
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pub mod htmlaudioelement;
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pub mod htmlbaseelement;
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pub mod htmlbodyelement;
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pub mod htmlbrelement;
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pub mod htmlbuttonelement;
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pub mod htmlcanvaselement;
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pub mod htmlcollection;
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pub mod htmldataelement;
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pub mod htmldatalistelement;
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pub mod htmldetailselement;
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pub mod htmldialogelement;
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pub mod htmldirectoryelement;
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pub mod htmldivelement;
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pub mod htmldlistelement;
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pub mod htmlelement;
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pub mod htmlembedelement;
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pub mod htmlfieldsetelement;
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pub mod htmlfontelement;
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pub mod htmlformcontrolscollection;
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pub mod htmlformelement;
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pub mod htmlframeelement;
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pub mod htmlframesetelement;
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pub mod htmlheadelement;
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pub mod htmlheadingelement;
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pub mod htmlhrelement;
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pub mod htmlhtmlelement;
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pub mod htmliframeelement;
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pub mod htmlimageelement;
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pub mod htmlinputelement;
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pub mod htmllabelelement;
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pub mod htmllegendelement;
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pub mod htmllielement;
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pub mod htmllinkelement;
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pub mod htmlmapelement;
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pub mod htmlmediaelement;
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pub mod htmlmenuelement;
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pub mod htmlmetaelement;
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pub mod htmlmeterelement;
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pub mod htmlmodelement;
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pub mod htmlobjectelement;
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pub mod htmlolistelement;
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pub mod htmloptgroupelement;
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pub mod htmloptionelement;
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pub mod htmloptionscollection;
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pub mod htmloutputelement;
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pub mod htmlparagraphelement;
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pub mod htmlparamelement;
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pub mod htmlpictureelement;
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pub mod htmlpreelement;
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pub mod htmlprogresselement;
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pub mod htmlquoteelement;
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pub mod htmlscriptelement;
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pub mod htmlselectelement;
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pub mod htmlsourceelement;
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pub mod htmlspanelement;
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pub mod htmlstyleelement;
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pub mod htmltablecaptionelement;
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pub mod htmltablecellelement;
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pub mod htmltablecolelement;
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pub mod htmltableelement;
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pub mod htmltablerowelement;
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pub mod htmltablesectionelement;
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pub mod htmltemplateelement;
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pub mod htmltextareaelement;
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pub mod htmltimeelement;
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pub mod htmltitleelement;
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pub mod htmltrackelement;
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pub mod htmlulistelement;
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pub mod htmlunknownelement;
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pub mod htmlvideoelement;
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pub mod identityhub;
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pub mod imagebitmap;
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pub mod imagedata;
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pub mod inputevent;
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pub mod keyboardevent;
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pub mod location;
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pub mod mediadeviceinfo;
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pub mod mediadevices;
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pub mod mediaelementaudiosourcenode;
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pub mod mediaerror;
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pub mod mediafragmentparser;
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pub mod medialist;
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pub mod mediametadata;
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pub mod mediaquerylist;
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pub mod mediaquerylistevent;
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pub mod mediasession;
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pub mod mediastream;
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pub mod mediastreamaudiodestinationnode;
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pub mod mediastreamaudiosourcenode;
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pub mod mediastreamtrack;
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pub mod mediastreamtrackaudiosourcenode;
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pub mod messagechannel;
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pub mod messageevent;
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pub mod messageport;
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pub mod mimetype;
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pub mod mimetypearray;
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pub mod mouseevent;
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pub mod mutationobserver;
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pub mod mutationrecord;
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pub mod namednodemap;
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pub mod navigationpreloadmanager;
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pub mod navigator;
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pub mod navigatorinfo;
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pub mod node;
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pub mod nodeiterator;
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pub mod nodelist;
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pub mod offlineaudiocompletionevent;
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pub mod offlineaudiocontext;
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pub mod offscreencanvas;
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pub mod offscreencanvasrenderingcontext2d;
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pub mod oscillatornode;
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pub mod pagetransitionevent;
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pub mod paintrenderingcontext2d;
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pub mod paintsize;
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pub mod paintworkletglobalscope;
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pub mod pannernode;
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pub mod performance;
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pub mod performanceentry;
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pub mod performancemark;
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pub mod performancemeasure;
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pub mod performancenavigation;
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pub mod performancenavigationtiming;
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pub mod performanceobserver;
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pub mod performanceobserverentrylist;
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pub mod performancepainttiming;
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pub mod performanceresourcetiming;
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pub mod permissions;
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pub mod permissionstatus;
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pub mod plugin;
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pub mod pluginarray;
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pub mod popstateevent;
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pub mod processinginstruction;
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pub mod progressevent;
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pub mod promise;
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pub mod promisenativehandler;
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pub mod promiserejectionevent;
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pub mod radionodelist;
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pub mod range;
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pub mod raredata;
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pub mod readablestream;
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pub mod request;
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pub mod response;
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pub mod rtcdatachannel;
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pub mod rtcdatachannelevent;
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pub mod rtcerror;
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pub mod rtcerrorevent;
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pub mod rtcicecandidate;
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pub mod rtcpeerconnection;
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pub mod rtcpeerconnectioniceevent;
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pub(crate) mod rtcrtpsender;
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pub(crate) mod rtcrtptransceiver;
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pub mod rtcsessiondescription;
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pub mod rtctrackevent;
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pub mod screen;
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pub mod selection;
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pub mod serviceworker;
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pub mod serviceworkercontainer;
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pub mod serviceworkerglobalscope;
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pub mod serviceworkerregistration;
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pub mod servoparser;
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pub mod shadowroot;
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pub mod stereopannernode;
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pub mod storage;
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pub mod storageevent;
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pub mod stylepropertymapreadonly;
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pub mod stylesheet;
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pub mod stylesheetlist;
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pub mod submitevent;
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pub mod svgelement;
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pub mod svggraphicselement;
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pub mod svgsvgelement;
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pub mod testbinding;
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pub mod testbindingiterable;
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pub mod testbindingpairiterable;
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pub mod testbindingproxy;
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pub mod testrunner;
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pub mod testworklet;
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pub mod testworkletglobalscope;
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pub mod text;
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pub mod textcontrol;
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pub mod textdecoder;
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pub mod textencoder;
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pub mod textmetrics;
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pub mod texttrack;
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pub mod texttrackcue;
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pub mod texttrackcuelist;
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pub mod texttracklist;
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pub mod timeranges;
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pub mod touch;
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pub mod touchevent;
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pub mod touchlist;
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pub mod trackevent;
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pub mod transitionevent;
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pub mod treewalker;
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pub mod uievent;
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pub mod url;
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pub mod urlhelper;
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pub mod urlsearchparams;
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pub mod userscripts;
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pub mod validation;
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pub mod validitystate;
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pub mod values;
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pub mod vertexarrayobject;
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pub mod videotrack;
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pub mod videotracklist;
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pub mod virtualmethods;
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pub mod vttcue;
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pub mod vttregion;
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pub mod webgl2renderingcontext;
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pub mod webgl_extensions;
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pub mod webgl_validations;
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pub mod webglactiveinfo;
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pub mod webglbuffer;
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pub mod webglcontextevent;
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pub mod webglframebuffer;
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pub mod webglobject;
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pub mod webglprogram;
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pub mod webglquery;
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pub mod webglrenderbuffer;
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pub mod webglrenderingcontext;
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pub mod webglsampler;
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pub mod webglshader;
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pub mod webglshaderprecisionformat;
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pub mod webglsync;
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pub mod webgltexture;
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pub mod webgltransformfeedback;
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pub mod webgluniformlocation;
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pub mod webglvertexarrayobject;
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pub mod webglvertexarrayobjectoes;
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pub mod websocket;
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pub mod wheelevent;
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pub mod window;
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pub mod windowproxy;
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pub mod worker;
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pub mod workerglobalscope;
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pub mod workerlocation;
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pub mod workernavigator;
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pub mod worklet;
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pub mod workletglobalscope;
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pub mod xmldocument;
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pub mod xmlhttprequest;
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pub mod xmlhttprequesteventtarget;
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pub mod xmlhttprequestupload;
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pub mod xmlserializer;
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pub mod xrcompositionlayer;
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pub mod xrcubelayer;
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pub mod xrcylinderlayer;
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pub mod xrequirectlayer;
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pub mod xrframe;
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pub mod xrhand;
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pub mod xrhittestresult;
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pub mod xrhittestsource;
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pub mod xrinputsource;
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pub mod xrinputsourcearray;
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pub mod xrinputsourceevent;
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pub mod xrinputsourceschangeevent;
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pub mod xrjointpose;
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pub mod xrjointspace;
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pub mod xrlayer;
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pub mod xrlayerevent;
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pub mod xrmediabinding;
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pub mod xrpose;
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pub mod xrprojectionlayer;
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pub mod xrquadlayer;
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pub mod xrray;
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pub mod xrreferencespace;
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pub mod xrrenderstate;
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pub mod xrrigidtransform;
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pub mod xrsession;
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pub mod xrsessionevent;
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pub mod xrspace;
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pub mod xrsubimage;
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pub mod xrsystem;
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pub mod xrtest;
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pub mod xrview;
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pub mod xrviewerpose;
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pub mod xrviewport;
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pub mod xrwebglbinding;
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pub mod xrwebgllayer;
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pub mod xrwebglsubimage;
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pub use self::webgl_extensions::ext::*;
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