In the following spots a "MouseUp" eventName is being used, which does look inconsistent considering that the "Mouse Down"/"Mouse Enter"/"Mouse Exit" eventNames all have a space in them.
Is this inconsistency actually expected, or is it a simple typo? If the former, then a comment explaining *why* would be appropriate; otherwise we should just fix this :-)

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L806

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L945

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1034

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1168

/cc @calixteman 
19,
        11,
        11,
        19,
        11,
      ]);
      expect(getQuadPoints(dict, rect)).toEqual([
        [
          { x: 10, y: 20 },
          { x: 20, y: 20 },
          { x: 10, y: 10 },
          { x: 20, y: 10 },
        ],
        [
          { x: 11, y: 19 },
          { x: 19, y: 19 },
          { x: 11, y: 11 },
          { x: 19, y: 11 },
        ],
      ]);
    });
    it("should normalize and process quadints in non-standard orders", function () {
      rect = [10, 10, 20, 20];
      const nonStandardOrders = [
        
        [10, 20, 20, 20, 20, 10, 10, 10],
        
        [10, 10, 20, 10, 10, 20, 20, 20],
        
        [10, 10, 20, 10, 20, 20, 10, 20],