@antadesign/anta
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    Interface AExpanderAttributesUnreviewed

    Attributes for the <a-expander> disclosure. Authors supply direct a-expander-summary (or a-expander-title), a-expander-actions, a-expander-indicator, and a-expander-details regions. The element owns its native shadow button and collapsed body; styles load externally.

    interface AExpanderAttributes {
        onClick?: (e: any) => void;
        onDoubleClick?: (e: any) => void;
        onAuxClick?: (e: any) => void;
        onContextMenu?: (e: any) => void;
        onMouseDown?: (e: any) => void;
        onMouseUp?: (e: any) => void;
        onMouseEnter?: (e: any) => void;
        onMouseLeave?: (e: any) => void;
        onMouseMove?: (e: any) => void;
        onMouseOver?: (e: any) => void;
        onMouseOut?: (e: any) => void;
        onPointerDown?: (e: any) => void;
        onPointerUp?: (e: any) => void;
        onPointerMove?: (e: any) => void;
        onPointerEnter?: (e: any) => void;
        onPointerLeave?: (e: any) => void;
        onPointerOver?: (e: any) => void;
        onPointerOut?: (e: any) => void;
        onPointerCancel?: (e: any) => void;
        onGotPointerCapture?: (e: any) => void;
        onLostPointerCapture?: (e: any) => void;
        onTouchStart?: (e: any) => void;
        onTouchEnd?: (e: any) => void;
        onTouchMove?: (e: any) => void;
        onTouchCancel?: (e: any) => void;
        onKeyDown?: (e: any) => void;
        onKeyUp?: (e: any) => void;
        onFocus?: (e: any) => void;
        onBlur?: (e: any) => void;
        onChange?: (e: any) => void;
        onInput?: (e: any) => void;
        onBeforeInput?: (e: any) => void;
        onInvalid?: (e: any) => void;
        onReset?: (e: any) => void;
        onSubmit?: (e: any) => void;
        onSelect?: (e: any) => void;
        onCopy?: (e: any) => void;
        onCut?: (e: any) => void;
        onPaste?: (e: any) => void;
        onCompositionStart?: (e: any) => void;
        onCompositionUpdate?: (e: any) => void;
        onCompositionEnd?: (e: any) => void;
        onDrag?: (e: any) => void;
        onDragStart?: (e: any) => void;
        onDragEnd?: (e: any) => void;
        onDragEnter?: (e: any) => void;
        onDragLeave?: (e: any) => void;
        onDragOver?: (e: any) => void;
        onDrop?: (e: any) => void;
        onScroll?: (e: any) => void;
        onWheel?: (e: any) => void;
        onAnimationStart?: (e: any) => void;
        onAnimationEnd?: (e: any) => void;
        onAnimationIteration?: (e: any) => void;
        onTransitionEnd?: (e: any) => void;
        onLoad?: (e: any) => void;
        onError?: (e: any) => void;
        onAbort?: (e: any) => void;
        onToggle?: (e: any) => void;
        onBeforeToggle?: (e: any) => void;
        onCanPlay?: (e: any) => void;
        onCanPlayThrough?: (e: any) => void;
        onDurationChange?: (e: any) => void;
        onEmptied?: (e: any) => void;
        onEnded?: (e: any) => void;
        onLoadedData?: (e: any) => void;
        onLoadedMetadata?: (e: any) => void;
        onLoadStart?: (e: any) => void;
        onPause?: (e: any) => void;
        onPlay?: (e: any) => void;
        onPlaying?: (e: any) => void;
        onProgress?: (e: any) => void;
        onRateChange?: (e: any) => void;
        onSeeked?: (e: any) => void;
        onSeeking?: (e: any) => void;
        onStalled?: (e: any) => void;
        onSuspend?: (e: any) => void;
        onTimeUpdate?: (e: any) => void;
        onVolumeChange?: (e: any) => void;
        onWaiting?: (e: any) => void;
        key?: string | number | null;
        id?: string;
        class?: string;
        className?: string;
        style?: CSSProperties;
        children?: ReactNode;
        slot?: string;
        tabIndex?: number;
        role?: string;
        state?: "open" | "closed";
        "default-state"?: "open" | "closed";
        priority?: "primary" | "secondary" | "tertiary";
        outdent?: boolean | "";
        disabled?: boolean | "";
        round?: boolean | number | string;
        tone?:
            | "neutral"
            | "brand"
            | "info"
            | "success"
            | "warning"
            | "critical"
            | string & {};
        onstatechange?: (
            e: CustomEvent<{ next: "open" | "closed"; prev: "open" | "closed" }>,
        ) => void;
    }

    Hierarchy (View Summary)

    Index
    onClick? onDoubleClick? onAuxClick? onContextMenu? onMouseDown? onMouseUp? onMouseEnter? onMouseLeave? onMouseMove? onMouseOver? onMouseOut? onPointerDown? onPointerUp? onPointerMove? onPointerEnter? onPointerLeave? onPointerOver? onPointerOut? onPointerCancel? onGotPointerCapture? onLostPointerCapture? onTouchStart? onTouchEnd? onTouchMove? onTouchCancel? onKeyDown? onKeyUp? onFocus? onBlur? onChange? onInput? onBeforeInput? onInvalid? onReset? onSubmit? onSelect? onCopy? onCut? onPaste? onCompositionStart? onCompositionUpdate? onCompositionEnd? onDrag? onDragStart? onDragEnd? onDragEnter? onDragLeave? onDragOver? onDrop? onScroll? onWheel? onAnimationStart? onAnimationEnd? onAnimationIteration? onTransitionEnd? onLoad? onError? onAbort? onToggle? onBeforeToggle? onCanPlay? onCanPlayThrough? onDurationChange? onEmptied? onEnded? onLoadedData? onLoadedMetadata? onLoadStart? onPause? onPlay? onPlaying? onProgress? onRateChange? onSeeked? onSeeking? onStalled? onSuspend? onTimeUpdate? onVolumeChange? onWaiting? key? id? class? className? style? children? slot? tabIndex? role? state? default-state? priority? outdent? disabled? round? tone? onstatechange?
    onClick?: (e: any) => void
    onDoubleClick?: (e: any) => void
    onAuxClick?: (e: any) => void
    onContextMenu?: (e: any) => void
    onMouseDown?: (e: any) => void
    onMouseUp?: (e: any) => void
    onMouseEnter?: (e: any) => void
    onMouseLeave?: (e: any) => void
    onMouseMove?: (e: any) => void
    onMouseOver?: (e: any) => void
    onMouseOut?: (e: any) => void
    onPointerDown?: (e: any) => void
    onPointerUp?: (e: any) => void
    onPointerMove?: (e: any) => void
    onPointerEnter?: (e: any) => void
    onPointerLeave?: (e: any) => void
    onPointerOver?: (e: any) => void
    onPointerOut?: (e: any) => void
    onPointerCancel?: (e: any) => void
    onGotPointerCapture?: (e: any) => void
    onLostPointerCapture?: (e: any) => void
    onTouchStart?: (e: any) => void
    onTouchEnd?: (e: any) => void
    onTouchMove?: (e: any) => void
    onTouchCancel?: (e: any) => void
    onKeyDown?: (e: any) => void
    onKeyUp?: (e: any) => void
    onFocus?: (e: any) => void
    onBlur?: (e: any) => void
    onChange?: (e: any) => void
    onInput?: (e: any) => void
    onBeforeInput?: (e: any) => void
    onInvalid?: (e: any) => void
    onReset?: (e: any) => void
    onSubmit?: (e: any) => void
    onSelect?: (e: any) => void
    onCopy?: (e: any) => void
    onCut?: (e: any) => void
    onPaste?: (e: any) => void
    onCompositionStart?: (e: any) => void
    onCompositionUpdate?: (e: any) => void
    onCompositionEnd?: (e: any) => void
    onDrag?: (e: any) => void
    onDragStart?: (e: any) => void
    onDragEnd?: (e: any) => void
    onDragEnter?: (e: any) => void
    onDragLeave?: (e: any) => void
    onDragOver?: (e: any) => void
    onDrop?: (e: any) => void
    onScroll?: (e: any) => void
    onWheel?: (e: any) => void
    onAnimationStart?: (e: any) => void
    onAnimationEnd?: (e: any) => void
    onAnimationIteration?: (e: any) => void
    onTransitionEnd?: (e: any) => void
    onLoad?: (e: any) => void
    onError?: (e: any) => void
    onAbort?: (e: any) => void
    onToggle?: (e: any) => void
    onBeforeToggle?: (e: any) => void
    onCanPlay?: (e: any) => void
    onCanPlayThrough?: (e: any) => void
    onDurationChange?: (e: any) => void
    onEmptied?: (e: any) => void
    onEnded?: (e: any) => void
    onLoadedData?: (e: any) => void
    onLoadedMetadata?: (e: any) => void
    onLoadStart?: (e: any) => void
    onPause?: (e: any) => void
    onPlay?: (e: any) => void
    onPlaying?: (e: any) => void
    onProgress?: (e: any) => void
    onRateChange?: (e: any) => void
    onSeeked?: (e: any) => void
    onSeeking?: (e: any) => void
    onStalled?: (e: any) => void
    onSuspend?: (e: any) => void
    onTimeUpdate?: (e: any) => void
    onVolumeChange?: (e: any) => void
    onWaiting?: (e: any) => void
    key?: string | number | null

    React/Preact reconciliation key when rendered inside a list.

    id?: string

    HTML id attribute.

    class?: string

    HTML class attribute (standard DOM).

    className?: string

    React/Preact-style class name. Alias for class.

    style?: CSSProperties

    Inline styles applied to the element.

    children?: ReactNode
    slot?: string

    Assigns the element to a named <slot> (e.g. slot="title").

    tabIndex?: number

    Tab order. Set to 0 to make the element keyboard-focusable.

    role?: string

    ARIA role override.

    state?: "open" | "closed"

    Controlled open state ('open' / 'closed'). Present → controlled: the attribute is the source of truth, clicks only dispatch the cancelable statechange event, and the consumer answers by updating it. Absent → uncontrolled (use default-state). See STATEFUL-COMPONENTS.md.

    "default-state"?: "open" | "closed"

    Initial open state for the uncontrolled mode ('open' / 'closed'); read once when the element connects.

    priority?: "primary" | "secondary" | "tertiary"

    Surface emphasis. secondary (default) is a subtle fill; primary is a stronger raised fill; tertiary is transparent.

    outdent?: boolean | ""

    Align the title and body with surrounding content on a tertiary expander. The start indicator hangs in the gutter; an end indicator stays inside its edge. Presence-based.

    disabled?: boolean | ""

    Disables the header: not clickable or focusable, hover affordance off, text dimmed. The open state freezes as-is. Presence-based.

    round?: boolean | number | string

    Use a 1rem corner radius in both disclosure states. A length value (round="12px") overrides it. Presence-based for the boolean form.

    tone?:
        | "neutral"
        | "brand"
        | "info"
        | "success"
        | "warning"
        | "critical"
        | string & {}

    Semantic tone, or any literal CSS color for a one-off custom tone. Named tones re-point the text + filled surface palette; a custom color keeps its hue with lightness/chroma pinned. 'neutral' is the default (same as omitting it).

    onstatechange?: (
        e: CustomEvent<{ next: "open" | "closed"; prev: "open" | "closed" }>,
    ) => void

    Fires before the open state changes — the element dispatches a cancelable statechange CustomEvent whose detail is { next, prev } in the 'open'|'closed' vocabulary. Uncontrolled, preventDefault() vetoes the transition. The all-lowercase spelling is deliberate — it's the one form both renderers bind to the statechange event (React 19 keeps the case after on, so onStateChange would listen for "StateChange"; Preact lowercases).

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