コピーボタン — アクセシブルな UI コンポーネント

カテゴリ: アクション
トークン: comp.copy-button
レベル: 合成
構成要素: Button

概要

Web: tanrei-copy-button; schedule
SwiftUI: TanreiCopyButton; radio_button_unchecked
Jetpack Compose: TanreiCopyButton; radio_button_unchecked
Flutter: TanreiCopyButton; radio_button_unchecked
React Native: CopyButton; radio_button_unchecked

生成元 docs/status/status.json, specs/copy-button.spec.json

押すと、グリフがしばらくチェックに変わります

コピーボタンは、ユーザーがほかの場所に貼り付けるものの横に置きます。コマンド、キー、アドレス、色の値などです。ブラウザーの応答を待ってから、チェック（またはエラーの印）を 2 秒間表示し、支援技術には言葉で伝えます。コードブロックは、コピーボタンを自動で配置します。

使い方

コピーボタンは、指定したバリアントとサイズのボタンです。固有の色や寸法を持たないので、デザインシステムがボタンの見た目を変えると、すべてのコピーボタンも一緒に変わります。

言葉は利用者側で用意します。label、copied-label、failed-label に既定値はありません。Tanrei はどの言語の言葉も同梱していないためです。

SwiftUI、Compose、Flutter、React Native は計画中です。このページの冒頭で各プラットフォームに添えた名前は仕様が定めたもので、まだ提供していません。

<!-- アイコンだけ（既定）：label が名前になります。 -->
<tanrei-copy-button
  text="npm install @tanrei/web"
  label="コピー"
  copied-label="コピーしました"
  failed-label="コピーできませんでした"
></tanrei-copy-button>

<!-- ラベル付き：状態に合わせて文言が変わり、幅は変わりません。 -->
<tanrei-copy-button
  icon-only="false"
  variant="tonal"
  text="https://example.com/s/4f2a"
  label="リンクをコピー"
  copied-label="リンクをコピーしました"
  failed-label="コピーできませんでした"
></tanrei-copy-button>

<!-- ラベル付きで、幅が文言に合わせて変わる形：行の末尾でだけ使います。 -->
<tanrei-copy-button
  icon-only="false"
  label-width="fit"
  text="sk-test-0000"
  label="コピー"
  copied-label="クリップボードにコピーしました"
  failed-label="コピーできませんでした"
></tanrei-copy-button>

<script type="module">
  import '@tanrei/web';

  document.querySelector('tanrei-copy-button').addEventListener('copyfailed', () => {
    // ボタンは、コピーできなかったことを伝え終えています。その先の対応は利用者側で行います。
  });
</script>

import { CopyButton } from '@tanrei/react';

<CopyButton text={command} label="コピー" copiedLabel="コピーしました" failedLabel="コピーできませんでした" onCopyFailed={() => showHelp()} />

仕様

サイズとバリアントはボタンのものです

3 つの文言のうち最も長いものの幅を確保します

隣のボタンは動きません

label-width を fit にすると、幅が文言に合わせて変わります

label-width="fit" を指定すると、ラベル付きの形の幅は、表示している文言の幅になります。文言が変わると、幅は comp.copy-button.motion.resize-duration をかけて新しい文言の幅へなめらかに変わります。動きを減らす設定では、すぐに変わります。既定は widest のままです。押そうとした瞬間に動くコントロールは、押し間違いのもとになるからです。fit は、行の末尾など、ボタンの後ろに次に押されそうなものが何もない場所でだけ使います。

ボタンには 3 つの状態があります。通常（グリフ content_copy）、コピー済み（check）、失敗（error）です。コピー済みの表示に変わるのは、ブラウザーがコピーを確認した後だけです。comp.copy-button.confirmation.duration（2 秒）が過ぎると通常に戻ります。確認を表示している間に押すと、もう一度コピーして確認します。

状態が変わっても、何も動きません。3 つのグリフは同じボックスに描きます。ラベル付きの形は、既定では最も長い文言の幅を常に確保します。label-width="fit" を指定すると、上の例のように幅が文言に合わせて変わります。

グリフはモーションなしで切り替わります。2 秒は気付くための時間なので、動きを減らす設定でも短くしません。

「コピー済み」を表示している間にテキストが変わると、すぐに通常に戻ります。コピーした内容が、いまコピーされる内容と違うためです。

イベントは copied と copyfailed です。copy という名前ではありません。copy は文書のクリップボードイベントだからです。

構成要素

パーツ	説明
1 `container`	The button: a Button of the chosen variant and size, drawn from the Button's tokens. It carries the state answer.
2 `icon`	The glyph, in one box whatever it shows: content_copy at rest, check when the text has been copied, error when it could not be.
3 `label` · 任意	The button's text, where it is not icon-only: label at rest, copiedLabel and failedLabel in the two other forms, in a box as wide as the widest of the three (labelWidth widest) or as the one shown (labelWidth fit).

プロパティ

プロパティ	型	既定値	説明
`text`	`string`	`""`	The text to copy, exactly as it will be pasted. Plain text only.
`label`	`string`	`""`	What the button does, in the product's language ("Copy", "Copy link", "Copy JSON"): the accessible name of the icon-only form and the visible text of the labelled one. Required.
`copiedLabel`	`string`	`""`	What is announced, and shown in the labelled form, when the text has been copied ("Copied"). Required.
`failedLabel`	`string`	`""`	What is announced, and shown in the labelled form, when the platform refuses the copy ("Could not copy"). Required.
`iconOnly`	`boolean`	`true`	True draws the glyph alone, named by label. False draws the glyph and the label as text.
`labelWidth`	`widest` \| `fit`	`"widest"`	How wide the labelled form's text box is. widest, the default, keeps it as wide as the widest of label, copiedLabel and failedLabel at all times, so the button never changes its width and nothing beside it moves (CPY-7). fit makes it as wide as the text it shows, and eases its width to the new text when the form changes (CPY-19): for a button with nothing after it in its row that a person may press next. Ignored while iconOnly is true.
`variant`	`filled` \| `tonal` \| `elevated` \| `outlined` \| `text`	`"text"`	The Button variant it is drawn as. The default, text, is the quiet icon action beside what it copies; a copy that is a view's main action takes another. The values are Button's.
`size`	`small` \| `medium` \| `large`	`"medium"`	The Button size it is drawn at (32 / 40 / 56). The values are Button's.
`disabled`	`boolean`	`false`	Prevents the copy; the button is drawn and exposed as a disabled Button.

イベント

イベント	説明
`copied`	The platform confirmed that the text is on the clipboard; carries the text.
`copyFailed`	The platform refused the copy or has no clipboard to write to; carries the platform's reason where it gives one.

状態

振る舞い

EARS 記法による要件です。各プラットフォームの実装は、この ID に対応するテストで検証されます。要件の原文は仕様ファイルのものをそのまま掲載しています。

ID	要件
`CPY-1`	THE copy button SHALL be drawn as a Button (BTN) of its variant and size, from the Button's own tokens in every state — its container, its glyph, its label, its state layer, its outline and elevation, its disabled form — icon-only with the glyph content_copy WHILE iconOnly is true, and with that glyph leading and label as its text otherwise. It SHALL have no color, shape or measure of its own, SHALL extend its hit area as BTN-5 says, and SHALL draw its glyphs through the platform's icon helper, as a Button does.
`CPY-2`	WHEN the copy button is activated by pointer, touch, Enter, Space or assistive technology THE copy button SHALL ask the platform to put text on the clipboard as plain text, exactly as given; it SHALL NOT read the clipboard, SHALL NOT copy anything but text, SHALL NOT move focus, and SHALL NOT show the copied form before the platform has answered. A second activation before that answer SHALL be ignored.
`CPY-3`	WHEN the platform confirms that the text is on the clipboard THE copy button SHALL take the copied form: the glyph check in place of content_copy, in the same box and the same color, and, WHILE iconOnly is false, copiedLabel in place of label; it SHALL emit copied once, carrying the text, and SHALL return to rest comp.copy-button.confirmation.duration after it took the form.
`CPY-4`	IF the platform refuses the copy or has no clipboard to write to THEN THE copy button SHALL take the failed form — the glyph error in the same box and the same color, and, WHILE iconOnly is false, failedLabel in place of label — SHALL emit copyFailed once, and SHALL return to rest comp.copy-button.confirmation.duration after it took the form. It SHALL NOT select the text, open a dialog or try another way by itself: what else happens is the product's, on that event. IF text is empty WHEN the copy button is activated THEN it SHALL copy nothing and take the failed form, and in debug builds report that there was nothing to copy.
`CPY-5`	WHEN the copy button takes the copied form THE copy button SHALL have assistive technology announce copiedLabel once, politely (after what is being read); WHEN it takes the failed form it SHALL have failedLabel announced once, assertively. Every activation SHALL be announced anew, also when the same words were announced a moment before. The announcement SHALL NOT move keyboard or screen-reader focus, and nothing SHALL be announced on the return to rest.
`CPY-6`	WHILE iconOnly is true THE copy button SHALL be named by label in every form: its name does not change with its form, and the form is told by the announcement of CPY-5. WHILE iconOnly is false THE copy button SHALL be named by the text it shows. THE glyph SHALL be kept from assistive technology in every form.
`CPY-7`	THE copy button SHALL NOT move or resize anything when it changes form, but as CPY-19 says WHILE labelWidth is fit: the three glyphs are drawn in one box; WHILE iconOnly is false and labelWidth is widest the label's box SHALL be as wide as the widest of label, copiedLabel and failedLabel at all times, the shown text at its start, and the button's width and height SHALL be the same in every form; its height SHALL be the same in every form whatever labelWidth is; and the copy button SHALL open no popover, menu or other surface of its own but the confirmation of CPY-18, which takes no room.
`CPY-8`	WHEN the copy button is activated WHILE it is in the copied or the failed form THE copy button SHALL copy again as CPY-2 says and, on the platform's answer, take the form that answer gives, emit its event, announce it (CPY-5) and count the duration from that moment.
`CPY-9`	THE copy button SHALL change its glyph and its text at once, without a motion, in both directions (WHILE labelWidth is fit only the width of the text's box moves, as CPY-19 says); the time of comp.copy-button.confirmation.duration is a time to notice and SHALL NOT be shortened or skipped where motion is reduced. WHEN text changes WHILE the copy button is in the copied form THE copy button SHALL return to rest at once: what was copied is no longer what would be.
`CPY-10`	WHILE disabled is true THE copy button SHALL be drawn and exposed as a disabled Button, SHALL copy nothing and SHALL emit nothing; WHEN it becomes disabled WHILE in the copied or the failed form it SHALL return to rest at once.
`CPY-11`	WHILE the system's icon set cannot yet draw a glyph of the copy button (its font is still loading) THE copy button SHALL draw nothing in that glyph's place, never the glyph's name as text, SHALL keep the glyph's box, and SHALL draw the glyph once the set can; label, copiedLabel and failedLabel SHALL still reach assistive technology.
`CPY-12`	WHEN the copy button is pressed by pointer, touch, Enter or Space THE copy button SHALL show the pressed state without delay and SHALL keep it visible for at least sys.motion.duration.press-hold, even when the press ends sooner.
`CPY-13`	WHILE pressed THE copy button SHALL answer as sys.behavior.pressed-feedback names: overlay applies the pressed tokens to the whole container at once; ripple grows the pressed state layer from the point of contact (from the center for keyboard activation); dim applies the pressed opacity to the whole control and draws no state layer; none draws no answer to the press. Under ripple and dim only the container color stays with the state under the press; label, icon, outline, elevation, opacity and shape still come from the pressed tokens. Under none every part stays with the state under the press. The ripple grows over comp.button.motion.feedback-duration with comp.button.motion.state-easing, fades over the state duration of its size (comp.button.motion.state-duration.small, .medium or .large) with comp.button.motion.state-easing once the press has ended and press-hold has passed, and appears whole where motion is reduced.
`CPY-14`	THE copy button SHALL ease its container corners by sys.shape.corner-smoothing (0 is a quarter circle, 0.6 the iOS continuous corner; a platform with only the OS curve draws it for any amount above 0) and show its keyboard focus as sys.behavior.focus-style names (ring or glow); a platform that cannot draw a choice SHALL fall back to the first value and state that in its README.
`CPY-15`	THE copy button SHALL take its layout direction from where it is used — the direction of the nearest ancestor that sets one, and the platform's own where none does — and SHALL have no direction setting of its own; WHEN that direction changes while the copy button is shown THE copy button SHALL draw itself for the new direction at once, without a motion of its own, keeping its form, the time left before it returns to rest and its focus.
`CPY-16`	WHERE the layout direction is right-to-left THE copy button SHALL place its glyph and its label as a Button places a leading icon and a label (BTN-11), and SHALL draw each of its glyphs mirrored left to right exactly when the system's icon set marks that glyph's name as mirrored: the icon helper mirrors the glyph inside its own box, changing neither its place, size, color and fill. THE copy button SHALL NOT mirror a glyph itself.
`CPY-17`	WHILE label, copiedLabel or failedLabel is empty THE copy button SHALL still render and copy, and in debug builds report which is missing: an icon-only button without label has no accessible name, unless the product gives it a name of its own on the element — aria-label, or aria-labelledby naming an element — which it then exposes as its accessible name and does not report missing. WHILE label is not empty THE copy button SHALL expose the name CPY-6 says, over a name the product gives it on the element (aria-label or aria-labelledby). WHEN variant or size names a value the Button does not have in the active design system THE copy button SHALL be drawn with its own default for that prop, and in debug builds report the unknown value.
`CPY-18`	WHEN the copy button takes the copied or the failed form WHILE iconOnly is true THE copy button SHALL show copiedLabel or failedLabel as a plain Tooltip (TIP) of its button — drawn from the Tooltip's own tokens and placed as it places itself, at the top by default — for as long as the form lasts, and SHALL close it at the return to rest; each answer of CPY-8 SHALL show it anew. It SHALL take no focus and no room, move nothing, and SHALL NOT open or close on hover, focus or a long press; it SHALL be closed by Escape and by another tooltip that opens, as any tooltip is, and SHALL be kept from assistive technology, which hears the words once, from the announcement of CPY-5. WHILE iconOnly is false THE copy button SHALL show no such bubble: its label says it.
`CPY-19`	WHILE iconOnly is false and labelWidth is fit THE copy button SHALL make the label's box as wide as the text it shows, and its button as wide as that box and its glyph make it, the text on one line; WHEN the shown text changes — the form changes, or the words of the form shown do — THE copy button SHALL change the box's width from the width it has to the new text's over comp.copy-button.motion.resize-duration with comp.copy-button.motion.resize-easing, keeping its height, its glyph and the start of its text in place and clipping the text at the box's end while the box is narrower than it, and SHALL change the width at once where motion is reduced. THE copy button SHALL take its first width, and a width that changes because the text's face has arrived, at once. A change of form during the motion SHALL continue from the width reached.
`CPY-20`	WHERE the platform has ARIA attributes (the web), WHEN the product sets an aria- attribute on the host, by the attribute or by the ARIA property that reflects it, THE copy button SHALL move it to the data-aria- attribute of the same name, so that the host is no second node with its name, description or state, and SHALL expose it on the element that carries its role — an id reference by the elements it names in the host's tree or a tree around it, an error message as part of the description while the copy button is invalid — except those the copy button owns (aria-pressed, aria-disabled), which it SHALL move and not expose. WHEN the product removes the aria- attribute or its data-aria- twin, or sets the ARIA property that reflects it (ariaLabel, ariaDescribedByElements…) to null, THE copy button SHALL take it off that element. WHEN the product sets an aria- attribute the copy button owns THE copy button SHALL report it in debug builds.

プラットフォーム別の名前対応

パリティは API が同一であることを意味しません。同じ契約を、各プラットフォームの流儀で表現します。

仕様	Web	SwiftUI	Jetpack Compose	Flutter	React Native
コンポーネント	`tanrei-copy-button`	`TanreiCopyButton`	`TanreiCopyButton`	`TanreiCopyButton`	`CopyButton`
`text` · プロパティ	`text`	`text`	`text`	`text`	`text`
`label` · プロパティ	`label`	`label`	`label`	`label`	`label`
`copiedLabel` · プロパティ	`copiedLabel`	`copiedLabel`	`copiedLabel`	`copiedLabel`	`copiedLabel`
`failedLabel` · プロパティ	`failedLabel`	`failedLabel`	`failedLabel`	`failedLabel`	`failedLabel`
`iconOnly` · プロパティ	`iconOnly`	`iconOnly`	`iconOnly`	`iconOnly`	`iconOnly`
`labelWidth` · プロパティ	`labelWidth`	`labelWidth`	`labelWidth`	`labelWidth`	`labelWidth`
`variant` · プロパティ	`variant`	`variant`	`variant`	`variant`	`variant`
`size` · プロパティ	`size`	`size`	`size`	`size`	`size`
`disabled` · プロパティ	`disabled`	`disabled`	`enabled`	`enabled`	`disabled`
`copied` · イベント	`copied`	`onCopied`	`onCopied`	`onCopied`	`onCopied`
`copyFailed` · イベント	`copyfailed`	`onCopyFailed`	`onCopyFailed`	`onCopyFailed`	`onCopyFailed`
備考	`<tanrei-copy-button text="…" label="Copy" copied-label="Copied" failed-label="Could not copy">`, with `icon-only="false"` for the labelled form. Its shadow root holds a `<tanrei-button>` (so every Button token and state applies unchanged) and one visually hidden live region: `role="status"` for the copied announcement and `role="alert"` for the failed one, emptied and set again on each activation so the same words are spoken twice (CPY-5). CPY-2 is `navigator.clipboard.writeText(text)`, which needs a secure context and the person's activation; where the API is missing or the promise rejects, that is CPY-4 — no `document.execCommand` fallback. The events are named `copied` and `copyfailed`, not `copy`, because `copy` is the document's own clipboard event and bubbles. CPY-7: the three labels are stacked in one grid cell, two of them `visibility: hidden`. CPY-19 (`label-width="fit"`): the box's `inline-size` is set to the shown text's measured width and transitions over the resize tokens (none under `prefers-reduced-motion: reduce`), clipped at its end with `overflow-x: clip`; a `ResizeObserver` on the three texts takes a new face's widths at once. The timer is a `setTimeout` of the token's value read from the custom property, cleared on a new activation and on disconnect.	`TanreiCopyButton(text:, label:, copiedLabel:, failedLabel:, iconOnly:, variant:, size:)` over `TanreiButton`. Writes `UIPasteboard.general.string` (`NSPasteboard.general` on macOS), which does not fail; the failed form is reached only where no pasteboard exists (a preview). Announces with `AccessibilityNotification.Announcement`, at high priority for the failed form. `disabled` is the environment's `isEnabled`. It owes labelWidth (CPY-19) as well: fit, a width that follows the shown text, eased over comp.copy-button.motion.resize-duration and at once where motion is reduced.	`TanreiCopyButton(text, label, copiedLabel, failedLabel, iconOnly, variant, size, enabled)` over `TanreiButton`, writing through the platform clipboard of the composition. Android 13 and later show the system's own confirmation of a copy: there the copy button still changes its glyph and leaves the announcement of copiedLabel to the system, so the person is told once; the README says so. Earlier versions announce through a polite live region on the button's semantics. It owes labelWidth (CPY-19) as well: fit, a width that follows the shown text, eased over comp.copy-button.motion.resize-duration and at once where motion is reduced.	`TanreiCopyButton(text: …, label: …, copiedLabel: …, failedLabel: …)` over `TanreiButton`. `Clipboard.setData(ClipboardData(text: text))`; a `PlatformException` is CPY-4. Announces with `SemanticsService.announce`, assertively for the failed form. On Android 13 and later the same rule as Compose's applies. It owes labelWidth (CPY-19) as well: fit, a width that follows the shown text, eased over comp.copy-button.motion.resize-duration and at once where motion is reduced.	`<CopyButton text="…" label="Copy" copiedLabel="Copied" failedLabel="Could not copy" />` over `Button`. React Native has no clipboard in its core: the package takes the app's writer (`write={(text) => Clipboard.setStringAsync(text)}`) or a provider set once at the app's root, and a missing writer is CPY-4 with a debug report. Which of the two, and whether a clipboard module becomes an optional peer dependency, is the platform agent's to propose. Announces with `AccessibilityInfo.announceForAccessibility`. Follows the app's direction where an ancestor's is not known. It owes labelWidth (CPY-19) as well: fit, a width that follows the shown text, eased over comp.copy-button.motion.resize-duration and at once where motion is reduced.

トークン

トークン	参照先	解決値（ライト）
`--tanrei-comp-copy-button-confirmation-duration`	—	2000ms
`--tanrei-comp-copy-button-motion-resize-duration`	`sys.motion.role.resize.default`	300ms
`--tanrei-comp-copy-button-motion-resize-easing`	`sys.motion.easing.spatial`	cubic-bezier(0.2, 0, 0, 1)

フィクスチャ

基準となる描画パターンです。全プラットフォームが同じ ID でスナップショットを撮り、結果を比較できるようにしています。

icon

text: npm install @tanrei/web label: Copy copiedLabel: Copied failedLabel: Could not copy

icon-small

text: npm install @tanrei/web label: Copy copiedLabel: Copied failedLabel: Could not copy size: small

icon-large

text: npm install @tanrei/web label: Copy copiedLabel: Copied failedLabel: Could not copy size: large

icon-tonal

text: #30a3f0 label: Copy color copiedLabel: Copied failedLabel: Could not copy variant: tonal

icon-outlined

text: #30a3f0 label: Copy color copiedLabel: Copied failedLabel: Could not copy variant: outlined

icon-elevated

text: #30a3f0 label: Copy color copiedLabel: Copied failedLabel: Could not copy variant: elevated

icon-filled

text: #30a3f0 label: Copy color copiedLabel: Copied failedLabel: Could not copy variant: filled

icon-disabled

text: npm install @tanrei/web label: Copy copiedLabel: Copied failedLabel: Could not copy disabled: true

labelled

text: { "name": "acme" } label: Copy JSON copiedLabel: Copied failedLabel: Could not copy iconOnly: false

labelled-tonal

text: https://example.com/s/4f2a label: Copy link copiedLabel: Link copied failedLabel: Could not copy iconOnly: false variant: tonal

labelled-filled-small

text: https://example.com/s/4f2a label: Copy link copiedLabel: Link copied failedLabel: Could not copy iconOnly: false variant: filled size: small

labelled-outlined-large

text: https://example.com/s/4f2a label: Copy link copiedLabel: Link copied failedLabel: Could not copy iconOnly: false variant: outlined size: large

labelled-long-confirmation

text: sk-test-0000 label: Copy copiedLabel: Copied to the clipboard failedLabel: Could not copy iconOnly: false variant: outlined

labelled-fit

text: sk-test-0000 label: Copy copiedLabel: Copied to the clipboard failedLabel: Could not copy iconOnly: false labelWidth: fit variant: outlined

labelled-disabled

text: sk-test-0000 label: Copy key copiedLabel: Copied failedLabel: Could not copy iconOnly: false disabled: true

icon-rtl

text: https://example.com/s/4f2a label: نسخ copiedLabel: تم النسخ failedLabel: تعذر النسخ direction: rtl

labelled-rtl

text: https://example.com/s/4f2a label: نسخ الرابط copiedLabel: تم النسخ failedLabel: تعذر النسخ iconOnly: false variant: tonal direction: rtl

生成元 specs/copy-button.spec.json, tokens/comp/copy-button.tokens.json, design/tokens/

Web での描き方の違い

コピーには navigator.clipboard.writeText を使います。安全なページ（HTTPS または localhost）と、ユーザー自身が押すことが必要です。ブラウザーにクリップボードがないか、コピーを拒否したときは、失敗の表示になります。代わりの手段は試しません。
2 つのイベントはバブリングしますが、シャドウルートの外には出ません。

ガイドライン

アイコンだけとラベル付き

形	表示	使う場面
アイコンだけ	グリフ。チェックを表示している間は、その上の小さな吹き出しに文言も表示します	コピーするものの横。コマンド、コードブロック、行の中の値
ラベル付き	グリフと文言。文言は状態に合わせて変わります	コピーが画面のアクションの 1 つであるとき、または文言を全員に伝えたいとき

推奨

置き場所から何をコピーするかが分からないときは、ラベルで伝えます。「リンクをコピー」「JSON をコピー」などです。
ユーザーがそのテキストをどうしても必要とする場面では、copyfailed を受け取り、消えない形で対応します。たとえば、テキストを選択した入力欄を表示します。
コピーするものの横に置くときは、Text バリアントのままにします。コピーが画面の主なアクションであるときは、別のバリアントを選びます。
ラベル付きのコピーボタンの後ろに、次に押されそうなものがあるときは、既定の幅のままにします。label-width="fit" は、そうしたものが何もない場所でだけ選びます。

非推奨

ホバーしたときだけボタンを表示しない。タッチでは見つけられません。
コピーの成功を独自のツールチップやスナックバーで知らせない。ボタンがすでに、文言でも知らせています。
テキスト以外のコピーには使わない。

アクセシビリティ

ロール: button
ラベル付け: The icon-only form is named by label, which is required, in every form: the name does not change when the glyph does. The labelled form is named by the text it shows. The result is announced through a live region: copiedLabel politely, failedLabel assertively (CPY-5).
最小ターゲット: 見た目のサイズが小さくても、ヒット領域は最小ターゲットサイズを満たします。 minimum 32px · pointer 44px · spacing 8px · touch 48px

キーボード操作

キー	動作
`Tab`	Moves focus to the copy button.
`Enter` / `Space`	Copies the text and confirms it; focus stays on the button.

備考

The target is the Button's (BTN-5): at least sys.target.touch for touch and sys.target.pointer for a fine pointer on both axes, whatever size is drawn.
The confirmation is a status message (WCAG 4.1.3): it reaches assistive technology without moving focus. The glyph change alone would say nothing to a person who cannot see it, and a changed name is not announced on every platform, which is why the icon-only form's name stays and the live region speaks.
The confirmation is not given by color: the glyph changes shape (check, error) in the Button's own icon color, and the words are announced. No success or error color is used.
The confirmation returns by itself after comp.copy-button.confirmation.duration. Nothing a person must act on is in it, so no timing control is needed (WCAG 2.2.1); a failure a person must act on is the product's to show, on copyFailed, in something that stays.
A sighted person using the icon-only form sees the check and, for as long as it shows, the same words in a bubble drawn as a plain Tooltip (CPY-18): the change of a glyph alone can be missed by a person who does not know the check, or who reads the page magnified. The bubble is not read a second time: the announcement of CPY-5 is the one assistive technology hears.
The labelled form's visible text is its name (WCAG 2.5.3) in every form. By default (labelWidth widest) its width is reserved for the widest of the three texts, so neighbouring controls do not move under a pointer about to press them (CPY-7). labelWidth fit lets the width follow the text — a change the person asked for by pressing, eased over a short motion and at once where motion is reduced (WCAG 2.3.3) — and is for a button that nothing a person may press next stands after; its own box still keeps the minimum target in every form.
Copying needs the platform's permission and, on the web, a secure page and a press by the person: a copy asked for by script alone may be refused, and is then a failure (CPY-4).

生成元 specs/copy-button.spec.json, tokens/sys/measure.tokens.json

コンポーネントが担うこと

ボタンです。ボタンコンポーネントと同じフォーカスインジケーター、最小ターゲット、キー操作（Enter と Space）を備えています。
アイコンだけの形は、どの状態でも label が名前です。グリフが変わっても、名前は変わりません。
結果はライブリージョンで読み上げます。copied-label は控えめに、failed-label は割り込んで、押すたびに読み上げ、フォーカスは動かしません。
アイコンだけの形では、確認が続く間、その文言をプレーンなツールチップとして描かれる吹き出しにも表示します。吹き出しはフォーカスを取らず、もう一度読み上げられることもなく、Escape で閉じます。
確認は、色ではなく、形と言葉で伝えます。
右から左のレイアウトでは、アイコンセットの定めに従って、コピーのグリフを左右反転します。チェックとエラーの印は反転しません。
ラベル付きの形は、既定では幅を変えません。押そうとしているポインターの下で、何も動きません。label-width="fit" では、幅が新しい文言に合わせてなめらかに変わり、動きを減らす設定ではすぐに変わります。

利用者側で行うこと

3 つのラベルを、プロダクトの言語で指定します。label のないアイコンだけのボタンには、アクセシブルネームがありません。
ユーザーがテキストを失ってはいけない場面では、失敗への対応を利用者側で行います。

ソースコードと Issue（GitHub）