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 
annotationDict.set("Type", Name.get("Annot"));
      annotationDict.set("Subtype", Name.get("Link"));
      annotationDict.set("A", actionDict);
      const annotationRef = Ref.get(12, 0);
      const xref = new XRefMock([{ ref: annotationRef, data: annotationDict }]);
      AnnotationFactory.create(
        xref,
        annotationRef,
        pdfManagerMock,
        idFactoryMock
      ).then(({ data }) => {
        expect(data.annotationType).toEqual(AnnotationType.LINK);
        expect(data.url).toBeUndefined();
        expect(data.unsafeUrl).toBeUndefined();
        expect(data.action).toEqual("GoToPage");
        done();
      }, done.fail);
    });
    it("should correctly parse a simple Dest", function (done) {
      const annotationDict = new Dict();
      annotationDict.set("Type", Name.get("Annot"));
      annotationDict.set("Subtype", Name.get("Link"));
      annotationDict.set("Dest", Name.get("LI0"));
      const annotationRef = Ref.get(583, 0);
      const xref = new XRefMock([{ ref: annotationRef, data: annotationDict }]);
      AnnotationFactory.create(
        xref,
        annotationRef,
        pdfManagerMock,
        idFactoryMock