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 
expect(data.dest).toEqual([
          { num: 17, gen: 0 },
          { name: "XYZ" },
          0,
          841.89,
          null,
        ]);
        done();
      }, done.fail);
    });
    it(
      "should correctly parse a Dest, which violates the specification " +
        "by containing a dictionary",
      function (done) {
        const destDict = new Dict();
        destDict.set("Type", Name.get("Action"));
        destDict.set("S", Name.get("GoTo"));
        destDict.set("D", "page.157");
        const annotationDict = new Dict();
        annotationDict.set("Type", Name.get("Annot"));
        annotationDict.set("Subtype", Name.get("Link"));
        
        
        annotationDict.set("Dest", destDict);
        const annotationRef = Ref.get(798, 0);
        const xref = new XRefMock([
          { ref: annotationRef, data: annotationDict },
        ]);
        AnnotationFactory.create(
          xref,