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 
borderStyle.setVerticalCornerRadius(3);
      expect(borderStyle.verticalCornerRadius).toEqual(3);
    });
    it("should not set and get an invalid vertical corner radius", function () {
      const borderStyle = new AnnotationBorderStyle();
      borderStyle.setVerticalCornerRadius("three");
      expect(borderStyle.verticalCornerRadius).toEqual(0);
    });
  });
  describe("MarkupAnnotation", function () {
    let dict, ref;
    beforeAll(function (done) {
      dict = new Dict();
      ref = Ref.get(1, 0);
      done();
    });
    afterAll(function () {
      dict = ref = null;
    });
    it("should set and get a valid creation date", function () {
      const markupAnnotation = new MarkupAnnotation({ dict, ref });
      markupAnnotation.setCreationDate("D:20190422");
      expect(markupAnnotation.creationDate).toEqual("D:20190422");
    });
    it("should not set and get an invalid creation date", function () {
      const markupAnnotation = new MarkupAnnotation({ dict, ref });
      markupAnnotation.setCreationDate(undefined);
      expect(markupAnnotation.creationDate).toEqual(null);
    });
    it("should not parse IRT/RT when not defined", function (done) {