/**
 * The runs of a vertical line's upright box in the HTML, with the line
 * height the browser uses for each: declarations of one `style` apply in
 * order, and a `font` shorthand resets `line-height` to `normal` unless it
 * carries one (`16px/2 Serif`). A run's em boxes are centred across the
 * column at `right + lineHeight / 2` from the box's flow top, so a run whose
 * line height is `normal` has no axis (NaN).
 */
export interface VerticalSpan {
    /** Along the line, px. */
    top: number;
    /** The run's axis from the box's flow top (the physical right edge), px. */
    axis: number;
    /** The line height in effect, px (NaN when `normal`). */
    lineHeight: number;
    /** The font size its own `font` sets, px (undefined: inherited). */
    size?: number;
    /** Its text, tags stripped. */
    text: string;
}
/** The line height a `style` attribute leaves in effect. */
export declare function effectiveLineHeight(style: string): string | undefined;
/** Every absolutely placed run (`top` + `right`) of `html` (a ruby base
 *  and its reading's runs too, inside their `<ruby>` and `<rt>`). */
export declare function verticalSpans(html: string): VerticalSpan[];
//# sourceMappingURL=verticalSpans.d.ts.map