export declare const enum WritingMode {
    LeftToRightHorizontalWriting = 0,
    RightToLeftHorizontalWriting = 1,
    RightToLeftVerticalWriting = 2,
    LeftToRightVerticalWriting = 3
}
export declare class CascadingStyleSheets {
    private readonly writingMode;
    private _top;
    constructor(writingMode: WritingMode);
    set top(value: number);
    get top(): number;
    toCSSProperties(): {
        top: string;
    };
}