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<!DOCTYPE html><html lang="ja"><head><meta charset="utf-8">
<title>HTML Standard — Custom elements（日本語訳）</title>
<link rel="stylesheet" href="common.css" type="text/css">
<link rel="stylesheet" href="common-whatwg.css" type="text/css">
<style>
code.bnf {
display: block;
color: var(--text-color-1);
}
.xattr {
font-family: monospace0, monospace;
color: var(--K-color);
}
#_CE-reactions {
font-size: 1.2em;
width: 28em;
height: 19em;
position: relative;
}
#_CE-reactions > div {
position: absolute;
text-align: center;
white-space: nowrap;
}
#_CE-reactions > div > span {
font-size: 0.9em;
font-family: sans-serif0, sans-serif;
}
#_CE-reactions > ._reaction {
top: 16em;
width: 4em;
height: 2em;
}
#_CE-reactions > ._reaction > span {
font-size: 0.8em;
}
</style>
<script src="common0.js"></script>
<script src="common1.js" async></script>
<script>
Util.ready = function(){
const source_data = {
toc_main: 'custom-elements',
generate: expand
};
Util.switchWordsInit(source_data);
}
function expand(){
const class_map = this.class_map;
const tag_map = this.tag_map;
const link_map = this.link_map;
return this.html.replace(
/%[\w\-~一-鿆あ-ん]+|`(.+?)([$@\^])(\w*)/g,
create_html
);
function create_html(match, key, indicator, klass){
if(!key) {//%
return `<var>${match.slice(1)}</var>`;
}
let href = '';
let href1 = '';
{
const n = key.indexOf('＠');
if(n > 0) {
href1 = key.slice(n + 1);
key = key.slice(0, n);
}
}
let text = key;
switch(klass){
case 'r':
text = `[${key}]`;
href = `HTML-references.html#refs${key}`;
break;
case 'mt': // media type
case 'l':
text = `"<code class="literal">${text}</code>"`;
break;
case 'eI': // ElementInternals
case 'm':
const n = text.indexOf('(');
if(n > 0){
key = text.slice(0, n);
text = key + text.slice(n).replace(/\w+/g, '<var>$&</var>');
}
break;
case 'a':
text = text.slice(text.indexOf('.') + 1);
break;
case 'eO': // obslete elem
href = `~HTMLobs#${key}`;
break;
case 'ps':
text = `:${key}`;
break;
case 'xA': // xattr
text = `[${key}]`;
break;
case 'h':
text = `<code class="header">${text}</code>`;
break;
case 'sl':
text = `[[${key}]]`;
break;
case 'U':
text = `U+${text}`;
break;
case 'smb':
text = `(<span class="char-symbol">${text}</span>)`;
break;
case 'xCode':
return `<a id="_ex-html-${key}">＊</a>`;
break;
case 'en':
return `<span lang="en">${key}</span>`;
break;
}
let tag = tag_map[klass];
if(tag) {
let classname = class_map[klass];
classname = classname ? ` class="${classname}"` : '';
text = `<${tag}${classname}>${text}</${tag}>`;
}
if(indicator !== '^'){
href = href1 || link_map[ klass ? `${klass}.${key}` : key ] || href;
if(!href){
console.log(match); // check error
return match;
}
switch(indicator){
case '$':
text = `<a href="${href}">${text}</a>`;
break;
case '@':
text = `<dfn id="${href.slice(1)}">${text}</dfn>`;
break;
}
}
return text;
}
}
</script>
<script type="text/plain" id="_source_data">
●●options
spec_date:2026-03-31
trans_update:2026-04-01
source_checked:250314
page_state_key:HTML
spec_status:LS
original_url:https://html.spec.whatwg.org/multipage/custom-elements.html
nav_prev:HEcanvas
nav_next:HTMLselectors
trans_1st_pub:2016-05-04
●●class_map
e:element
eO:element
a:attr
et:event-type
st:attr-state
v:value
E:error
jv:js-value
jt:js-type
jA:abstract
sl:js-slot
xA:xattr
ps:pseudo
css:css
U:code-point
●●tag_map
I:code
m:code
mb:code
eI:code
E:code
c:code
e:code
eO:code
a:code
et:code
st:i
ps:code
jv:code
jt:code
jA:span
sl:span
h:code
xA:code
css:code
v:code
V:var
U:span
i:i
cite:cite
em:em
●●words_table1
Window: <code>Window</code>
is0:<code class="attr">is</code>
●●words_table
●データ／構造／操作／IDL
IDL:Web IDL
並び:sequence
キー
prototype:
chain:
受入-:adopt::~
作成-法:creating
削除子:deleter::~
可反復:iterable::~
manipulation
accessor::::アクセス子:アクセサ
子たち:children
localName
文書内:inDocument
文書外:outOfDocument
内容とする:contain
~label先~control:associated with
上層:top of:~
内包-:include::~
●処理
例外投出あり:rethrow any exceptions::~
再入的:reentrant:~
再入:reentrancy:~
-:fail
漸進的:progressive::~
渡され:passされ:~
不能化d:disabled::不能化
小task:microtask::小 task:小タスク
checkpoint:
旧-:old:~
新-:new:~
instance化:instantiate
処理-中:processing
変化-後の:new
何もしない:no-op
●変数
%文書:document
%名前空間:namespace
%局所~名:localName
%名前:name
%名:name
%is:is
%定義:-
%定義:definition
%extends:extends
%~formに所有され得るか:formAssociated
%内部特能を不能化するか:disableInternals
%~shadowを不能化するか:disableShadow
%観測される属性~群:observedAttributes
%~lifecycle~callback群:lifecycleCallbacks
%~callback名:callbackName
%観測される属性~群の可反復:observedAttributesIterable
%不能化された特能~群:disabledFeatures
%不能化された特能~群の可反復:disabledFeaturesIterable
%~formに所有され得る値:formAssociatedValue
%~prototype:prototype
%昇格~候補~群:upgradeCandidates
%要素:element
%~map:-
%候補:candidate
%属性:attribute
%C:C
%構築-結果:constructResult
%反応~stack:reactionsStack
%引数~list:args
%~callback:callback
%切断-時の~callback:disconnectedCallback
%接続-時の~callback:connectedCallback
%属性~名:attributeName
%~queue:queue
%反応~queue:reactions
%e:-
%手続き:-
%例外:-
%値:value
%~target:target
%~shadow:shadow
%妥当か:-
%提出~値:-
%~entry~list:entry list
%~registry:registry
%広義-子孫:inclusiveDescendant
●custom
lifecycle:
:::ライフサイクル
~installする:installation
拡張:extension
昇格:upgrade::~::アップグレード
昇格~法:upgrading
昇格ng:upgrading::昇格::アップグレーディング
切断-:disconnect::~
自律的:autonomous::~
定義-済み:defined
定義-済み時:when-defined
保存-:save:~
予備の:backup::~
内部特能:internals::~
視野~付き:scoped
●form提出
無毒化:sanitization::~
模倣-:emulate:~
復旧-:restore::~
拘束~検証:constraint validation::~
支援-:assist:~
再起動:restart:~
埋める:fillする:~
~formを埋める:form-filling
付-:attach::~
に関して難あり:suffering from
~formに所有され得る:form-associated
●環境／UI／呈示
viewer::::ビューア
agent:
surrounding:
生成元が類似な:similar-origin
ARIA:
forward:
main
~style付け:styling
ヤリトリありでなくす:non-interactive
編集:editing::~
編集-:edit::~
編集-不能:non-editable
隠す:hideする::~
発声-:announce::~
~focus能:focusability
check::::チェック
~check有無:checkedness
~check有無:checked
checkbox::::チェックボックス
●構文
statement::文
英大文字:upper alpha:~
英小文字:lower alpha:~
●仕様
機能:function:~
隔たり:gap:~
出来事:occurrences:~
今日:today:~
不可欠:crucial:~
図式:schematic diagram:~
自明:trivial:~
不精確:imprecise:~
念頭:mind:~
全装備:full-featured:~
柔軟:flexible:~
flexibility
際どい:edge:きわどい
派生-:derive:~
欠点:drawbacks:~
流儀:fashion:~
複雑:complicated:~
それなりに複雑な:rather-complicated
いくぶん複雑な:somewhat-complicated
複雑に:complicated
組成-:composite::~
消費-:consume:使用
消費者:consumer:使用者
行使:exercise:~
給-:supply:~
合理化-:rationalise:~
増強-:enhance:~
enhancement
補足-:supplement:~
希望-:hope:~
決着-:settle:~
強いら:forceさ:~
forcing
防護-:guard:~
代理-:proxy:~
検索-:look up:~
維持-:retain:~
拡げて:expandして:~
責務:responsibility:~
地点:points:~
排他的:exclusive:~
理由付け:reasoning:~
協調:coordination:~
共存-:co-exist:~
作者に公開される:author-exposed
予期されない:unexpected
標準な~HTML要素:the elements of HTML
機能, 意味論の両面で:both functionally and semantically
機能~面でも劣る:not very functional
意のままに:at will
通して:in terms of
他から~~干渉されると困る:delicate
一助:help／helping
楽でない:not a pleasure
見分け:pinpoint
そいつの意志:its own volition
~~想定されている:presumably
~~活動:effort
利用し難く:less usable
微妙な所がある:somewhat subtle
可能な限り:give maximum
気の利いた:fancy
に備わる特別なふるまい:the ways in which 〜 is special
今の所:as of now
今は:For now
すなわち:namely
備える:possess
総称して:collectively
良案:good idea
利する:on behalf of
具体的には:The following examples makes this concrete
summary
作者:you
~~示唆-:allude
できるように:allow
しないよう／できなくする:prevent
満たす:meet
要件に従わない:failing to follow
課される:bound
始めの方で:beginning
担当する:responsible to
該当する:fall into this category
着目:zooming in
関わらない:having no interesting
例で~~説明する:illustrate
~~機能:functioning
し忘れる:forget to
述べ:describe
不断に生やし続ける:continually "sprouting"
好ましい:preferable
~sure
〜とする:suppose
~~無視する:does not refer to
し易くする:help
そのような:similar
担う:took on
早くに抜け出る:bail out 〜 early
残す:left
伝える:inform／
伝えてtell
現れ:appear
至らせ:lead
埋められ:shrink
行う:carries out
有する:decorated
起きた:fact
持たせる:gain
置けば:put
在るときは:use its presence
-:catching
-:depend
-:conversion
弾かれる:hit
注釈-:decorated with
選んだ:choice
〜から見て:as viewed by
登場以前:predate
~~任意で選べる:opt in
取って代わる:supersede
委ねられる:Left as
~~要求どおり:as it ought to do
これ以上:going forward
●未分類
role:
MathML:
記事:article:~
-:collection
contrast:
分類:category:~
透過的:transparent::~
句ng:phrasing::句::フレージング
可触:palpable::~
背後:behind:~
国旗:country flag:~
候補:candidate:~
一定の:certain:~
名前空間~付け:namespacing
-:field
-:allocate
自前で:own
種類:kind
-:ready to
~say
~took
および:plus
内:inside
類:class
別種の:distinct kind
途中で:during the middle
直前:just before
time:
-:successful
より大きい:larger
大きい:large
始-:start
対応ing:corresponding
小さな:small
数:number
~~一括して:together as a batch
~become
早期 return:early-return
~end
~later
so long as
mix-in:mixing in
~point
stack-of-queue
今:now
~~真に一度限りの:truly one-time
〜で:key off
かなり:very
ある:particular
一環／一部:part of
各部:parts
一番上:the top of
不足:not very
別として:apart from
同様:just like before
外す:away
最後に:finally
多様な:large variety of
種々の:variety
様々な:variety of
種々の:various
各種:various
重ねて:twice
~F を返す場合:in the latter case
より低:lower-
し直-:re-
存在するとき:existence of
順に:one after the other
場:place
●●original_id_map
●●mdn_urls
customelementconstructor:API/CustomElementConstructor
customelementregistry:API/CustomElementRegistry
elementdefinitionoptions:API/ElementDefinitionOptions
elementinternals:API/ElementInternals
validitystateflags:API/ValidityStateFlags
attr-is:HTML/Global_attributes/is
●●link_map
●IDL
xA.CEReactions:#cereactions
CEReactions:#cereactions
E.SyntaxError:~WEBIDL#syntaxerror
E.TypeError:~TC39#sec-native-error-types-used-in-this-standard-typeerror
E.InvalidStateError:~WEBIDL#invalidstateerror
E.NotFoundError:~WEBIDL#notfounderror
E.NotSupportedError:~WEBIDL#notsupportederror
I.Function:~WEBIDL#Function
＊？~WEBIDL#common-Function
Promise:~WEBIDL#idl-promise
USVString:~WEBIDL#idl-USVString
I.CustomElementConstructor:#customelementconstructor
I.CustomElementRegistry:#customelementregistry
I.CustomStateSet:#customstateset
I.Node:~DOM4#interface-node → ~node
I.Document:~HTMLdom#document → 文書
I.Element:~DOM4#interface-element → 要素
I.ShadowRoot:~DOM4#interface-shadowroot
→ ~shadow根
I.ElementDefinitionOptions:#elementdefinitionoptions
I.ElementInternals:#elementinternals
I.ARIAMixin:~ARIA1#ARIAMixin
:~ARIA1#dom-ariamixin
I.File:~FILEAPI#file
I.File:~FILEAPI#dfn-file
I.FormData:~XHR#formdata
I.HTMLButtonElement:~HEforms#htmlbuttonelement
I.HTMLElement:~HTMLdom#htmlelement
I.HTMLFormElement:~HEforms#htmlformelement
I.HTMLQuoteElement:~HEgrouping#htmlquoteelement
I.HTMLUnknownElement:~HTMLdom#htmlunknownelement
I.NodeList:~DOM4#interface-nodelist
I.Window:~WINDOW#window
I.HTMLInputElement:~HEinput#htmlinputelement
I.HTMLLinkElement:~HEmetadata#htmllinkelement
I.Node:~DOM4#interface-node
I.ShadowRoot:~DOM4#interface-shadowroot
I.ValidityState:~HTMLforms#validitystate
I.ValidityStateFlags:#validitystateflags
●m
m.createElement:~DOM4#dom-document-createelement
m.createElementNS:~DOM4#dom-document-createelementns
m.new CustomElementRegistry:#dom-customelementregistry
m.customElements:#dom-window-customelements
m.define:#dom-customelementregistry-define
m.get:#dom-customelementregistry-get
m.getName:#dom-customelementregistry-getname
m.whenDefined:#dom-customelementregistry-whendefined
m.upgrade:#dom-customelementregistry-upgrade
m.initialize:#dom-customelementregistry-initialize
m.attachInternals:#dom-attachinternals
m.attachShadow:~DOM4#dom-element-attachshadow
＠~HTMLdynamic#dom-document-open
＠~HTMLdynamic#dom-document-write
＠~DOM4#dom-parentnode-movebefore
＠~HEforms#dom-form-elements
＠~HTMLdynamic#dom-element-sethtmlunsafe
mb.extends:#dom-elementdefinitionoptions-extends
eI.setFormValue:#dom-elementinternals-setformvalue
eI.setValidity:#dom-elementinternals-setvalidity
eI.validationMessage:#dom-elementinternals-validationmessage
eI.shadowRoot:#dom-elementinternals-shadowroot
eI.states:#dom-elementinternals-states
eI.labels:~HEforms#dom-elementinternals-labels
eI.checkValidity:~HTMLforms#dom-elementinternals-checkvalidity
eI.form:~HTMLforms#dom-elementinternals-form
eI.reportValidity:~HTMLforms#dom-elementinternals-reportvalidity
eI.validity:~HTMLforms#dom-elementinternals-validity
eI.willValidate:~HTMLforms#dom-elementinternals-willvalidate
eI.role＠~ARIA1#idl-def-ariamixin-role
eI.aria*＠~ARIA1#idl-def-ariamixin-ariaactivedescendantelement
st.Checkbox:~HEinput#checkbox-state-(type=checkbox)
[CEReactions]:#cereactions
●a
a.aria-*:~HTMLdep#attr-aria-*
a.aria-checked:~ARIA1#aria-checked
a.aria-disabled:~ARIA1#aria-disabled
a.aria-label:~ARIA1#aria-label
a.async:#attr-script-async
a.data-*:~HTMLdom#attr-data-*
a.disabled:~HTMLforms#attr-fe-disabled
a.form:~HTMLforms#attr-fae-form
a.is:#attr-is
a.name:~HTMLforms#attr-fe-name
a.readonly:#attr-face-readonly
a.role:~HTMLdep#attr-aria-role
a.tabindex:~HTMLinteraction#attr-tabindex
a.readonly:~HEinput#attr-input-readonly
●e
e.blockquote:~HEgrouping#the-blockquote-element
e.button:~HEforms#the-button-element
e.form:~HEforms#the-form-element
e.input:~HEinput#the-input-element
e.label:~HEforms#the-label-element
e.q:~HEtextlevel#the-q-element
e.script:~HEscripting#the-script-element
e.span:~HEtextlevel#the-span-element
●et
et.click:~POINTEREVENTS#dfn-click
et.keydown:~UIEVENTS#event-type-keydown
et.invalid:~HTMLindex#event-invalid
●js
jt.Object:~TC39#sec-object-type
jA.Get:~TC39#sec-get-o-p
jA.IsConstructor:~TC39#sec-isconstructor
jA.SameValue:~TC39#sec-samevalue
●code 他
l.button:~ARIA1#button
ps.defined:~HTMLselectors#selector-defined
ps.state():~HTMLselectors#selector-custom
ps.invalid:~HTMLselectors#selector-invalid
●用語
~callback反応:#callback-reaction
~custom化された組込みの要素:#customized-built-in-element
~custom要素:#custom-element
~custom要素~定義:#custom-element-definition
~custom要素~定義を検索する:#look-up-a-custom-element-definition
~custom要素~registryを検索する:#look-up-a-custom-element-registry
~custom要素~構築子:#custom-element-constructor
構築子:#custom-element-constructor
作動中な~custom要素~構築子~map:#active-custom-element-constructor-map
~custom要素~反応:#concept-custom-element-reaction
~custom要素~反応~stack:#custom-element-reactions-stack
~custom要素~反応~queue:#custom-element-reaction-queue
~custom要素~反応たちを呼出す:#invoke-custom-element-reactions
~custom要素~昇格~反応を~enqueueする:#enqueue-a-custom-element-upgrade-reaction
~custom要素~callback反応を~enqueueする:#enqueue-a-custom-element-callback-reaction
cD.~lifecycle~callback~map:#concept-custom-element-definition-lifecycle-callbacks
cD.観測される属性~群:#concept-custom-element-definition-observed-attributes
cD.名前:#concept-custom-element-definition-name
定義済み名:#concept-custom-element-definition-name
cD.局所~名:#concept-custom-element-definition-local-name
cD.構築~stack:#concept-custom-element-definition-construction-stack
cD.構築子:#concept-custom-element-definition-constructor
cD.内部特能を不能化するか:#concept-custom-element-definition-disable-internals
cD.~shadowを不能化するか:#concept-custom-element-definition-disable-shadow
cD.~formに所有され得るか:#concept-custom-element-definition-form-associated
cF.~entry構築~algo:#face-entry-construction
cF.状態:#face-state
cF.提出~値:#face-submission-value
cF.検証~anchor:#face-validation-anchor
cF.検証~message:#face-validation-message
cF.妥当性~flag群:#_validity-flags
状態~集合:#states-set
cR.視野~付きか:#is-scoped
cR.視野~付き文書~集合:#scoped-document-set
cR.~custom要素~定義~集合:#custom-element-definition-set
cR.要素~定義は走っているか:#element-definition-is-running
cR.定義-済み時~promise~map:#when-defined-promise-map
i.すでに構築-済みを表す~marker:#concept-already-constructed-marker
妥当な~custom要素~名:#valid-custom-element-name
定義:#custom-element-definition
定義-:#element-definition
要素~定義:#element-definition
~defining:#element-definition
現在の要素~queue:#current-element-queue
自律的~custom要素:#autonomous-custom-element
要素~queue:#element-queue
予備の要素~queue:#backup-element-queue
昇格~反応:#upgrade-reaction
要素を昇格するよう試行する:#concept-try-upgrade
要素を昇格する:#concept-upgrade-an-element
文書の中の特定0の要素たちを昇格する:#upgrade-particular-elements-within-a-document
昇格:#upgrades
昇格:#concept-upgrade-an-element
予備の要素~queueは処理-中か:#processing-the-backup-element-queue
適切な要素~queueに~enqueueする:#enqueue-an-element-on-the-appropriate-element-queue
内部~内容~属性~map:#internal-content-attribute-map
●用語 form/intrenals
iN.~target要素:#internals-target
付された内部特能:#attached-internals
~formに所有され得る~custom要素:#form-associated-custom-element
~entry~list:~HTMLforms#entry-list
fD.~entry~list:~XHR#concept-formdata-entry-list
fD.~entry:~HTMLforms#form-entry
fD.名:~HTMLforms#form-entry-name
~entryを作成する:~HTMLforms#create-an-entry
●用語（HTML form/intrenals
自身の拘束を満たして:~HTMLforms#concept-fv-valid
~form提出:~HTMLforms#concept-form-submit
~formに所有され得る要素:~HEforms#form-associated-element
~listされる:~HEforms#category-listed
~label可能:~HEforms#category-label
提出-可能:~HEforms#category-submit
再設定-可能:~HEforms#category-reset
拘束~検証の対象外:~HTMLforms#barred-from-constraint-validation
fe.不能化されて:~HTMLforms#concept-fe-disabled
~formを再設定する:~HTMLforms#concept-form-reset
再設定され:~HTMLforms#concept-form-reset
再設定~algo:~HTMLforms#concept-form-reset-control
~custom妥当性~error~message:~HTMLforms#custom-validity-error-message
~form所有者:~HTMLforms#form-owner
~form提出:~HTMLforms#form-submission
~form所有者を設定し直す:~HTMLforms#reset-the-form-owner
拘束をヤリトリありに検証する:~HTMLforms#interactively-validate-the-constraints
妥当性~状態:~HTMLforms#validity-states
~label先~control:~HEforms#labeled-control
●用語（HTML
接続されたとき:~HTMLINFRA#becomes-connected
切断されたとき:~HTMLINFRA#becomes-disconnected
適用-可能な仕様:~HTMLINFRA#other-applicable-specifications
~live:~HTMLINFRA#live
文書:~HTMLdom#the-document-object
分類:~HTMLdom#concept-element-categories
内容~属性:~HTMLdom#concept-element-attributes
内容~model:~HTMLdom#concept-element-content-model
この要素を利用できる文脈:~HTMLdom#concept-element-contexts
~accessibilityの考慮点:~HTMLdom#concept-element-accessibility-considerations
~DOM~interface:~HTMLdom#concept-element-dom
~flow内容:~HTMLdom#flow-content-2
大域~属性:~HTMLdom#global-attributes
可触~内容:~HTMLdom#palpable-content-2
句ng内容:~HTMLdom#phrasing-content-2
透過的:~HTMLdom#transparent
表現-:~HTMLdom#represents
要素~型:~HTMLINFRA#element-type
真偽-属性:~HTMLcms#boolean-attribute
生成元が類似な~window~agent:~WAPI#similar-origin-window-agent
関連な~agent:~WAPI#relevant-agent
例外を報告する:~WAPI#report-an-exception
rM.大域~obj:~WAPI#concept-realm-global
関連な大域~obj:~WAPI#concept-relevant-global
小taskを~queueする:~WAPI#queue-a-microtask
小task~checkpoint:~WAPI#perform-a-microtask-checkpoint
~focus可能:~HTMLinteraction#focusable
属する閲覧~文脈:~HTMLds#concept-document-bc
結付けられた文書:~WINDOW#concept-document-window
~HTML要素~構築子:~HTMLdom#html-element-constructors
~HTMLnav#restore-persisted-state
●用語（外部
~surrounding~agent:~TC39#surrounding-agent
~HTML名前空間:~INFRA#html-namespace
文字:~INFRA#code-point
~ASCII英大文字:~INFRA#ascii-upper-alpha
~ASCII英小文字:~INFRA#ascii-lower-alpha
~list:~INFRA#list
空:~INFRA#list-is-empty
~cloneする:~INFRA#list-clone
付加する:~INFRA#list-append
拡張する:~INFRA#list-extend
集合:~INFRA#ordered-set
set.付加する:~INFRA#set-append
~popする:~INFRA#stack-pop
~pushする:~INFRA#stack-push
~dequeueする:~INFRA#queue-dequeue
~map:~INFRA#ordered-map
~callback this 値:~WEBIDLjs#dfn-callback-this-value
~callback関数で構築する:~WEBIDLjs#construct-a-callback-function
~callback関数を呼出す:~WEBIDLjs#invoke-a-callback-function
~IDL値に変換する:~WEBIDLjs#dfn-convert-javascript-to-idl-value
拡張d属性:~WEBIDL#dfn-extended-attribute
新たな~promise:~WEBIDLjs#a-new-promise
却下される~promise:~WEBIDLjs#a-promise-rejected-with
解決される~promise:~WEBIDLjs#a-promise-resolved-with
~promiseを解決する:~WEBIDLjs#resolve
属する~realm:~WEBIDLjs#dfn-associated-realm
~tree順序:~DOM4#concept-tree-order
~node:~DOM4#concept-node
要素:~DOM4#concept-element
el.~custom:~DOM4#concept-element-custom
el.定義-済み:~DOM4#concept-element-defined
el.~custom要素~状態:~DOM4#concept-element-custom-element-state
el.~custom要素~定義:~DOM4#concept-element-custom-element-definition
el.~is0値:~DOM4#concept-element-is-value
el.~shadow根:~DOM4#concept-element-shadow-root
el.名前空間:~DOM4#concept-element-namespace
el.局所~名:~DOM4#concept-element-local-name
el.~custom要素~registry:~DOM4#element-custom-element-registry
doc.~custom要素~registry:~DOM4#document-custom-element-registry
sR.~custom要素~registry:~DOM4#shadowroot-custom-element-registry
attr.局所~名:~DOM4#concept-attribute-local-name
attr.値:~DOM4#concept-attribute-value
attr.名前空間:~DOM4#concept-attribute-namespace
妥当な属性~局所~名:~DOM4#valid-attribute-local-name
妥当な要素~局所~名:~DOM4#valid-element-local-name
~node文書:~DOM4#concept-node-document
範囲:~DOM4#concept-range
接続されて:~DOM4#connected
~shadow根:~DOM4#concept-shadow-root
~shadow~host:~DOM4#element-shadow-host
広義-子孫:~DOM4#concept-tree-inclusive-descendant
~shadowも含めた子孫:~DOM4#concept-shadow-including-descendant
~shadowも含めた広義-子孫:~DOM4#concept-shadow-including-inclusive-descendant
~shadowも含めた~tree順序:~DOM4#concept-shadow-including-tree-order
要素の内部特能から可用か:~DOM4#shadowroot-available-to-element-internals
属性~list:~DOM4#concept-element-attribute
要素~interface:~DOM4#concept-element-interface
移動-:~DOM4#concept-node-move-ext
＠~DOM4#concept-node-adopt
＠~DOM4#concept-element-attributes-change
＠~DOM4#concept-element-attributes-append
＠~DOM4#concept-element-attributes-remove
＠~DOM4#concept-element-attributes-replace
＠~DOM4#concept-create-element
要素を作成する:~DOM4#concept-create-element
~nodeを~cloneする:~DOM4#concept-node-clone
~role:~ARIA1#dfn-role
~access可能な名前:~ARIA1#dfn-accessible-name
~tokenに対し要素を作成する:~HTMLparsing#create-an-element-for-the-token
編集-可能:~EXEC-COMMAND#editable
疑似類:~SELECTORS4#pseudo-class
●●html_code_list
■custom-element-states-1
<％script>
class LabeledCheckbox extends HTMLElement {
constructor() {
super();
this._internals = this.attachInternals();
this.addEventListener('click', this._onClick.bind(this));
％
const %shadowRoot = this.attachShadow({mode: 'closed'});
%shadowRoot.innerHTML =
`<style>
:host::before {
content: '[ ]';
white-space: pre;
font-family: monospace;
}
:host(:state(checked))::before { content: '[x]' }
</style>
<slot>Label</slot>`;
}
％
get checked() { return this._internals.states.has('checked'); }
％
set checked(%flag) {
if (%flag)
this._internals.states.add('checked');
else
this._internals.states.delete('checked');
}
％
_onClick(%event) {
this.checked = !this.checked;
}
}
％
customElements.define('labeled-checkbox', LabeledCheckbox);
<％/script>
％
<style>
labeled-checkbox { border: dashed red; }
labeled-checkbox:state(checked) { border: solid; }
</style>
％
<labeled-checkbox>これをチェックする必要があります</labeled-checkbox>
■custom-element-states-2
<％script>
class QuestionBox extends HTMLElement {
constructor() {
super();
const shadowRoot = this.attachShadow({mode: 'closed'});
shadowRoot.innerHTML =