/**
 * One video at a time, or several together (#507): the HTML output marks a
 * video that plays alongside the others (`player.exclusive: false`) with
 * `data-pt-alongside`. Starting any other (exclusive) video pauses every
 * video playing under the same root; starting one that plays alongside
 * pauses only the exclusive ones, so the silent loops of a page run on
 * together.
 */
/** Whether a `<video>` plays alongside the others. */
export declare function playsAlongside(el: Element): boolean;
/** The videos to pause when `started` starts: every other playing video
 *  when it is exclusive, the exclusive ones when it plays alongside. */
export declare function videosToPause<T extends {
    paused: boolean;
}>(started: T, videos: Iterable<T>, alongside: (v: T) => boolean): T[];
/** Keeps the players under `root` to the rule above: listens for `play`
 *  (in the capture phase, as media events do not bubble) and pauses what
 *  the started video does not play alongside. Returns a function that
 *  stops listening. Call it once on the element that holds the HTML
 *  output (`renderToHtml`). */
export declare function coordinateVideoPlayback(root: Pick<HTMLElement, 'addEventListener' | 'removeEventListener' | 'querySelectorAll'>): () => void;
/** The rule above as a self-contained script (#507), for an output with no
 *  host page to call `coordinateVideoPlayback`: an EPUB content document
 *  links it, and a reading system that runs scripts keeps the document's
 *  videos to the rule (one that does not run them ignores it, and each
 *  video plays on its own terms). Plain ES5, no dependencies, rooted at
 *  the document; it mirrors `videosToPause` with `playsAlongside`. */
export declare const VIDEO_PLAYBACK_SCRIPT = "(function () {\n  'use strict';\n  function alongside(v) { return v.hasAttribute('data-pt-alongside'); }\n  document.addEventListener('play', function (e) {\n    var started = e.target;\n    if (!started || typeof started.tagName !== 'string' || started.tagName.toLowerCase() !== 'video') return;\n    var together = alongside(started);\n    var videos = document.getElementsByTagName('video');\n    var pause = [];\n    for (var i = 0; i < videos.length; i++) {\n      var v = videos[i];\n      if (v === started || v.paused) continue;\n      if (together && alongside(v)) continue;\n      pause.push(v);\n    }\n    for (var j = 0; j < pause.length; j++) pause[j].pause();\n  }, true);\n})();\n";
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