static getAbsoluteLengthInPixels_(value, cue, videoContainer) {
    const containerHeight = videoContainer.clientHeight;

    return (containerHeight * value / cue.cellResolution.rows) + 'px';
  }
Returns computed absolute length value in pixels based on cell
and a video container size
@param {number} value
@param {!shaka.text.Cue} cue
@param {HTMLElement} videoContainer
@return {string}

@private