// then we must return NaN. If it is unbounded, then positive infinity.
// http://www.w3.org/html/wg/drafts/html/master/embedded-content-0.html
@CalledByNative("MediaMetadata")
// then we must return NaN. If it is unbounded, then positive infinity.
// http://www.w3.org/html/wg/drafts/html/master/embedded-content-0.html
@CalledByNative("MediaMetadata")