this.container.setAttribute('data-termynal', '');
    }

    /**
     * Initialise the widget, get lines, clear container and start animation.
     */
    init() {
        /**
         * Calculates width and height of Termynal container.
         * If container is empty and lines are dynamically loaded, defaults to browser `auto` or CSS.
         */
        const containerStyle = getComputedStyle(this.container);