code: function findRecorder(div, selector) {
    if (!div) {
      if (!RecordingContext.recorders) {
        throw 'You must call RecordingContext.recordAll() before using other RecordingContext static methods';
      } else if (RecordingContext.recorders.length == 0) {
        throw 'Called a RecordingContext method, but no canvases are being recorded.';
      } else if (RecordingContext.recorders.length > 1) {
        throw 'Called a RecordingContext method while multiple canvases were being recorded. Specify one using a div and selector.';
      } else {
        return RecordingContext.recorders[0][1];
      }
    } else {
      return RecordingContext.recorderForSelector(div, selector);
    }
  }
docs: Resolves arguments for RecordingContext helpers. You can either specify a div & selector to find the canvas, or omit this if there's only one canvas being recorded.