/**
 * Reserves room at the top of the host page for the annotation toolbar, so the
 * bar occupies space of its own instead of sitting on the customer's content.
 *
 * Without this the bar is roughly 100px of dead zone on a phone — 44px plus
 * the notch inset — covering exactly the strip most sites put their header in,
 * and taps there do nothing at all with no explanation. Measured on a device:
 * everything below responded, the whole top band did not.
 *
 * Known limit, and it is not small: `position: fixed` and `sticky` elements do
 * not move with padding. A site whose header is fixed keeps it where it is,
 * still underneath the bar. This buys back normal-flow content, which is most
 * of the page, and nothing else.
 *
 * The host page is not ours, so the previous inline value is put back verbatim
 * — writing '' would delete a padding the page had set for its own reasons.
 */
export declare class PageOffset {
    private applied;
    private previousPadding;
    private previousTransition;
    reserve(px: number): void;
    release(): void;
    isApplied(): boolean;
}
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