export default class StackedAlphaVideo extends HTMLElement {
    #private;
    static observedAttributes: string[];
    constructor();
    connectedCallback(): void;
    disconnectedCallback(): void;
    attributeChangedCallback(name: string, _: string, newValue: string): void;
    get premultipliedAlpha(): boolean;
    /**
     * Set whether the source video uses premultiplied alpha.
     *
     * Set this to `true` if semi-transparent areas or outlines look too dark.
     */
    set premultipliedAlpha(value: boolean);
}