export declare class Rect {
    readonly left: number;
    readonly top: number;
    readonly width: number;
    readonly height: number;
    constructor(left: number, top: number, width: number, height: number);
    static from_element_offset(x: HTMLElement): Rect;
    get bottom(): number;
    get right(): number;
}
export declare class Canvas {
    private mark;
    private _canvas;
    get canvas(): HTMLElement;
    private measure;
    private is_interactive;
    private wait_mark;
    animate(x: HTMLElement, frames: Keyframe[], time: number): Promise<void>;
    animate_appear(x: HTMLElement, time: number): Promise<void>;
    click_to_continue(x?: HTMLElement): Promise<void>;
    show(x: HTMLElement): Promise<void>;
    show_error(error: string): Promise<void>;
    set_mark(x?: HTMLElement): void;
    is_empty(): boolean;
    render_to(x: HTMLElement): void;
}
export declare const canvas: Canvas;