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?Tailor made Parts
This specification describes the method for enabling the author to define and use new sorts of DOM things inside a document. It is regarded as a copy on the relevant parts of <>HTML ] up through commit 81ee034f316f4366aeb315d16ea21521c83ab427 and <>WHATWG-DOM ] through commit cb85ac4c35baa1345f2b71e2dd3d57b098ddf2d1. Section titles are prefixed with "HTML:" or "DOM:" to indicate which spec they copy from.
Status of This Document
This section describes the status of this document for the time of its publication. Other documents may supersede this document. A list of present-day W3C publications and then the latest revision of this technical report may possibly be found while in the W3C technical reports index at https://www.w3.org/TR/.
This document was published by the Internet System Working Group as a Working Draft. This document is intended to become a W3C Recommendation. If you want to make comments regarding this document, please send them to email@example.com (subscribe. archives ) with <custom>elements] on the begin the process of of your email's subject. All comments are welcome.
Publication as a Working Draft does not imply endorsement by the W3C Membership. This is often a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than operate in progress.
This document was produced by a group operating beneath the 5 February 2004 W3C Patent Policy. W3C maintains a public list of any patent disclosures made in relationship with the deliverables of your group; that site also comprises of instructions for disclosing a patent. An individual who has actual knowledge of the patent which the individual believes is made up of Essential Claim(s) must disclose the answers in accordance with section 6 belonging to the W3C Patent Policy.
This document is governed by the 1 September 2015 W3C Routine Document.
Table of Contents
In addition as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in such a specification are non-normative. Everything else during this specification is normative.
Any point, at which a conforming UA must make decisions about the state or reaction to the state on the conceptual design, is captured as algorithm. The algorithms are defined in terms of processing equivalence. The processing equivalence is truly a constraint imposed over the algorithm implementors, requiring the output in the the two UA-implemented plus the specified algorithm to be exactly the same for all inputs.
The IDL fragments in this particular specification must be interpreted as required for conforming IDL fragments, as described within the Web site IDL specification <>WEBIDL ].
two. HTML: Personalized aspects
This section is non-normative.
Personalized components grant a way for authors to construct their individual fully-featured DOM features. Although authors could always use non-standard features in their documents, with application-specific behaviour additional after the fact by scripting or similar, these kinds of aspects have historically been non-conforming and not very functional. By defining a tailor made element, authors can inform the parser how to properly construct an element and how things of that class should react to changes.
Custom made parts are part of the larger effort to "rationalise the platform", by explaining present system benefits (like the parts of HTML) in terms of lower-level author-exposed extensibility points (like custom made element definition). Although today there are scores of limitations around the abilities of personalized elements-both functionally and semantically-that prevent them from fully explaining the behaviours of HTML's present components, we hope to shrink this gap over time.
two.1.1 Setting up an autonomous tailor made element
This section is non-normative.
For your purposes of illustrating how to produce an autonomous tailor made element. let's define a tailor made element that encapsulates rendering a modest icon for a country flag. Our goal is to be able to implement it like so:
To do this, we primary declare a class for that tailor made element, extending HTMLElement :
We then need to have to make use of this class to define the element:
At this point, our higher than code will do the trick! The parser, whenever it sees the flag-icon tag, will construct a new instance of our FlagIcon class, and tell our code about its new country attribute, which we then use to established the element's internal state and update its rendering (when proper).
You can easlily also formulate flag-icon factors applying the DOM API:
Finally, we may utilize the customized element constructor itself. That is definitely, the over code is equivalent to:
two.1.two Building a customized built-in element
This section is non-normative.
Customized built-in parts are a distinct kind of personalized element. which are defined slightly differently and applied very differently compared to autonomous custom made parts. They exist to let reuse of behaviours from the current factors of HTML, by extending those parts with new personalized features. This is important since a wide selection of in the present behaviours of HTML features can unfortunately not be duplicated by utilizing purely autonomous customized parts. Instead, customized built-in aspects make it possible for the installation of customized construction behaviour, lifecycle hooks, and prototype chain onto present aspects, essentially "mixing in" these abilities on top on the already-existing element.
Customized built-in components require a distinct syntax from autonomous customized parts given that person agents and other software key off an element's local name in order to identify the element's semantics and behaviour. That is certainly, the concept of customized built-in parts establishing on top of current behaviour relies upon crucially over the extended things retaining their original local name.
On this example, we'll be designing a customized built-in element named plastic-button. which behaves like a normal button but gets fancy animation effects included whenever you click on it. We commence by defining a class, just like before, although this time we increase HTMLButtonElement instead of HTMLElement :
When defining our personalized element, we will need to also specify the extends option:
In general, the name from the element being extended cannot be determined simply by browsing at what element interface it extends, as a great deal of features share the same interface (this sort of as q and blockquote the two sharing HTMLQuoteElement ).
Trying make use of a customized built-in element as an autonomous tailor made element will not do the job; that is certainly, <plastic-button>Click me?</plastic-button> will simply set up an HTMLElement with no special behaviour.
In case you will need to produce a type-extended element programmatically, you possibly can utilize the following sort of createElement() :
And as before, the constructor will also do the trick:
Notably, all the on the ways in which button is special apply to this sort of "plastic buttons" at the same time: their focus behaviour, ability to participate in sort submission. the disabled attribute, and so on.
two.1.3 Disadvantages of autonomous tailor made factors
This section is non-normative.
As specified below, and alluded to over, simply defining and implementing an element called taco-button does not mean that this kind of components represent buttons. That is certainly, equipment this sort of as Web site browsers, search engines, or accessibility technologies will not immediately treat the resulting element as a button just depending on its defined name.
To convey the desired button semantics to some range of people, while you are nevertheless choosing an autonomous customized element. many techniques would have to have to be employed:
The addition on the tabindex attribute would make the taco-button interactive content. thus making it focusable. Note that if the taco-button were being to become logically disabled, the tabindex attribute would require to be removed.
The addition of different ARIA attributes helps convey semantics to accessibility know-how. For example, setting the role attribute to " button " will convey the semantics that this is usually a button, enabling people to successfully interact with the control utilising usual button-like interactions in their accessibility know-how. Setting the aria-label attribute is necessary to give the button an accessible name. instead of having accessibility technologies traverse its child textual content nodes and announce them. And setting aria-disabled to " true " in the event the button is logically disabled conveys to accessibility technological innovation the button's disabled state.
The addition of event handlers to handle commonly-expected button behaviours helps convey the semantics from the button to Word wide web browser customers. In this particular case, one of the most relevant event handler would be one particular that proxies correct keydown events to become click events, so that you simply can activate the button the two with keyboard and by clicking.
Furthermore to any default visible styling provided for taco-button parts, the visible styling will also ought to be updated to reflect changes in sensible state, like as becoming disabled; that is definitely, whatever stylesheet has rules for taco-button will also want to have rules for taco-button<disabled> .
With these points in mind, a full-featured taco-button that took over the responsibility of conveying button semantics (such as the ability to be disabled) would likely glimpse something like this:
Even with this rather-complicated element definition, the element isn't a pleasure make use of for consumers: it will be continually "sprouting" tabindex and aria-* attributes of its individual volition. This is considering as of now there isn't any way to specify default accessibility semantics or focus behaviour for customized components, forcing the use of these attributes to do so (even though they are usually reserved for allowing the consumer to override default behaviour).
In contrast, a straightforward customized built-in element. as revealed on the previous section, would robotically inherit the semantics and behaviour in the button element, with no will be needing to implement these behaviours manually. In general, for any features with nontrivial behaviour and semantics that assemble on top of present parts of HTML, customized built-in factors will be easier to cultivate, keep, and consume.
two.1.four Upgrading things after their development
This section is non-normative.
When you consider that element definition can occur at any time, a non-custom element could be created. and then later become a customized element after an acceptable definition is registered. We call this system "upgrading" the element, from the normal element into a personalized element.
Upgrades help scenarios where it may be preferable for customized element definitions to be registered after relevant features continues to be initially created, like as by the parser. They permit progressive enhancement of your content on the personalized element. For example, within the following HTML document the element definition for img-viewer is loaded asynchronously:
The definition with the img-viewer element below is loaded choosing a script element marked with the async attribute, placed after the <img-viewer> tag during the markup. Even when the script is loading, the img-viewer element will be treated as an undefined element, similar to your span. Once the script loads, it will define the img-viewer element, together with the present img-viewer element to the webpage will be upgraded, applying the tailor made element's definition (which presumably comprises of applying an image filter identified by the string "Kelvin", enhancing the image's visible appearance).
Note that upgrades only apply to features inside the document tree. (Formally, aspects that are connected .) An element that could be not inserted into a document will stay un-upgraded. An example illustrates this point:
two.two Prerequisites for tailor made element constructors
When authoring custom made element constructors. authors are bound by the following conformance needs:
A parameter-less call to super() must be the for starters statement while in the constructor body, to establish the correct prototype chain and this value before any further code is run.
A return statement must not appear everywhere inside the constructor body, unless it is mostly a effortless early-return ( return or return this ).
The element's attributes and children must not be inspected, as during the non-upgrade case none will be current, and relying on upgrades makes the element less usable.
The element must not gain any attributes or children, as this violates the expectations of consumers who utilize the createElement or createElementNS methods.
In general, succeed should be deferred to connectedCallback as a great deal as possible-especially job involving fetching resources or rendering. However, note that connectedCallback is usually called even more than once, so any initialization give good results that is definitely truly one-time will will want a guard to prevent it from operating twice.
In general, the constructor should be utilized to build initial state and default values, and to create event listeners and possibly a shadow root .
Several of these standards are checked during element development. either directly or indirectly, and failing to follow them will result inside a tailor made element that cannot be instantiated by the parser or DOM APIs.
two.3 Core concepts
A customized element is definitely an element that may be tailor made. Informally, this means that that its constructor and prototype are defined by the author, instead of by the consumer agent. This author-supplied constructor purpose is called the custom made element constructor .
Two distinct sorts of custom made aspects should be defined:
An autonomous personalized element. which is defined with no extends option. These varieties of custom made features have a local name equal to their defined name .
A customized built-in element. which is defined with the extends option. These styles of tailor made factors have local name equal to the value passed in their extends option, and their defined name is utilized because the value belonging to the is attribute.
After a tailor made element is created. changing the value for the is attribute does not change the element's behaviour, as it is saved for the element as its is value .
Autonomous custom made aspects have the following element definition:
An autonomous custom made element does not have any special meaning: it represents its children. A customized built-in element inherits the semantics within the element that it extends.
Any namespace-less attribute that could be relevant to the element's functioning, as determined by the element's author, may be specified on an autonomous personalized element. so prolonged as being the attribute name is XML-compatible and is made up of no uppercase ASCII letters. The exception is the is attribute, which must not be specified on an autonomous personalized element (and that can have no effect if it is).
Customized built-in components follow the normal standards for attributes, in accordance with the things they prolong. To incorporate customized attribute-based behavior, use data-* attributes.
A valid personalized element name is truly a sequence of characters name that meets all for the following specifications:
PotentialCustomElementName. = <a>z] (PCENChar )* '-' (PCENChar )* PCENChar. = "-" | "." | <>-9] | "_" | <a>z] | #xB7 | <>xC0-#xD6] | <>xD8-#xF6] | <>xF8-#x37D] | <>x37F-#x1FFF] | <>x200C-#x200D] | <>x203F-#x2040] | <>x2070-#x218F] | <>x2C00-#x2FEF] | <>x3001-#xD7FF] | <>xF900-#xFDCF] | <>xFDF0-#xFFFD] | <>x10000-#xEFFFF]
This works by using the EBNF notation from the XML specification. <>XML ]
name must not be any within the following:
The list of names previously mentioned is the summary of all hyphen-containing element names from the applicable specifications. namely SVG and MathML. <>SVG ] <>MATHML ]
These specifications ensure a variety of goals for valid custom made element names :
They commence having a lowercase ASCII letter. ensuring that the HTML parser will treat them as tags instead of as textual content.
They do not contain any uppercase ASCII letters. ensuring that the person agent can always treat HTML parts ASCII-case-insensitively.
They contain a hyphen, useful for namespacing and to ensure forward compatibility (since no parts will be included to HTML, SVG, or MathML with hyphen-containing local names during the foreseeable future).
They can always be created with createElement() and createElementNS(). which have restrictions that go beyond the parser's.
Apart from these restrictions, a vast range of names is allowed, to give maximum flexibility for use cases like <math-?> or <emotion-??> .
A customized element definition describes a personalized element and consists of:
To glimpse up a personalized element definition. given a document. namespace. localName. and is. perform the following steps. They will return either a tailor made element definition or null:
If namespace just isn't the HTML namespace. return null.
If document does not have a browsing context. return null.
two.four The CustomElementRegistry interface
Every Window object is associated having a unique instance of the CustomElementRegistry object, allocated once the Window object is created.
Custom made element registries are associated with Window objects, instead of Document objects, since every single customized element constructor inherits from the HTMLElement interface, and there exists exactly just one HTMLElement interface for each Window object.
The customElements attribute with the Window interface must return the CustomElementRegistry object for that Window object.
Every CustomElementRegistry has a list of custom made element definitions. initially empty. In general, algorithms on this specification appearance up factors inside the registry by any of name. local name. or constructor .
Every CustomElementRegistry also has an element definition is managing flag which is made use of to prevent reentrant invocations of element definition. It is initially unset.
Every CustomElementRegistry also has a when-defined promise map. mapping valid custom made element names to claims. It is utilised to implement the whenDefined() method.
window. customElements. define ( name. constructor ) Defines a new custom made element. mapping the given name to the given constructor as an autonomous customized element. window. customElements. define ( name. constructor. ) Defines a new tailor made element. mapping the given name to the given constructor as a customized built-in element for that element type identified by the supplied baseLocalName. A " NotSupportedError " DOMException will be thrown upon trying to increase a personalized element or an unknown element. window. customElements. get ( name ) Retrieves the custom made element constructor defined to the given name. Returns undefined if there is absolutely no tailor made element definition with the given name. window. customElements. whenDefined ( name ) Returns a promise that will be fulfilled when a customized element becomes defined with the given name. (If this kind of a personalized element is presently defined, the returned promise will be immediately fulfilled.) Returns a promise rejected accompanied by a " SyntaxError " DOMException if not given a valid custom made element name.
Element definition is a really procedure of adding a tailor made element definition to the CustomElementRegistry. This is accomplished by the define() method. When invoked, the define( name. constructor. solutions ) method must run these steps:
If IsConstructor ( constructor ) is false, then throw a TypeError and abort these steps.
Let interface be the element interface for localName and namespace .
Established result into a new element that implements interface. with no attributes, namespace established to namespace. namespace prefix established to prefix. local name established to localName. personalized element state established to " uncustomized ", tailor made element definition established to null, is value established to is. and node document established to document .
If namespace is the HTML namespace. and either localName is definitely a valid custom made element name or is is non-null, then established result ??â„¢s personalized element state to " undefined ".
To change an attribute attribute from an element element to value. run these steps:
Queue a mutation record of " attributes " for element with name attribute ??â„¢s local name. namespace attribute ??â„¢s namespace. and oldValue attribute ??â„¢s value.
If element is personalized. then enqueue a custom made element callback reaction with element. callback name " attributeChangedCallback ", and an argument list containing attribute ??â„¢s local name. attribute ??â„¢s value. value. and attribute ??â„¢s namespace.
To append an attribute attribute to an element element. run these steps:
Queue a mutation record of " attributes " for element with name attribute ??â„¢s local name. namespace attribute ??â„¢s namespace. and oldValue null.
If element is customized. then enqueue a personalized element callback reaction with element. callback name " attributeChangedCallback ", and an argument list containing attribute ??â„¢s local name. null, attribute ??â„¢s value. and attribute ??â„¢s namespace.
To remove an attribute attribute from an element element. run these steps:
Queue a mutation record of " attributes " for element with name attribute ??â„¢s local name. namespace attribute ??â„¢s namespace. and oldValue attribute ??â„¢s value.
If element is tailor made. then enqueue a custom made element callback reaction with element. callback name " attributeChangedCallback ", and an argument list containing attribute ??â„¢s local name. attribute ??â„¢s value. null, and attribute ??â„¢s namespace.
To replace an attribute oldAttr by an attribute newAttr in an element element. run these steps:
Queue a mutation record of " attributes " for element with name oldAttr ??â„¢s local name. namespace oldAttr ??â„¢s namespace. and oldValue oldAttr ??â„¢s value .
Replace oldAttr by newAttr with the element ??â„¢s attribute list .
Established oldAttr ??â„¢s element to null.
Established newAttr ??â„¢s element to element .
four.8 DOM: Cloning
To clone a node. having an optional document and clone children flag . run these steps:
If document is not really given, let document be node ??â„¢s node document .
If node can be an element. then:
Let copy be the result of putting together an element. given document. node ??â„¢s local name. node ??â„¢s namespace. node ??â„¢s namespace prefix. and also value of node ??â„¢s is attribute if existing (or null if not). The synchronous customized features flag should be unset.
For every single attribute in node ??â„¢s attribute list. in order, run these substeps:
Let copyAttribute be a clone of attribute .
Append copyAttribute to copy .
Otherwise, let copy be a node that implements the same interfaces as node. and fulfills these more conditions, switching on node :
Established copy ??â„¢s node document and document to copy. if copy is actually a document. and established copy ??â„¢s node document to document otherwise.
Run any cloning steps defined for node in other applicable specifications and pass copy. node. document and therefore the clone children flag if established, as parameters.
If the clone children flag is established, clone all the children of node and append them to copy. with document as specified additionally, the clone children flag being established.
Return copy .
four.9 DOM: Mutation algorithms
To insert a node into a parent before a child. having an optional suppress observers flag . run these steps:
This step intentionally does not fork out attention to the suppress observers flag .
For each and every node in nodes. in tree order. run these substeps:
Insert node into parent before child or for the conclude of parent if child is null.
Run the insertion steps with inclusiveDescendant .
If inclusiveDescendant is connected. then:
If inclusiveDescendant is customized. then enqueue a tailor made element callback reaction with inclusiveDescendant. callback name " connectedCallback ", and an empty argument list.
If this successfully upgrades inclusiveDescendant. its connectedCallback will be enqueued mechanically during the upgrade an element algorithm.
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