Configuration:
- PDF.js version: 2.0.550

Steps to reproduce the problem:
1. Render document in SVG mode `renderMode="svg"`

What is the expected behavior? (add screenshot)
Rendering annotations same way as they rendered on canvas

What went wrong? (add screenshot)
```
Warning: Unimplemented operator beginAnnotations
Warning: Unimplemented operator endAnnotations
```
expect(data.annotationType).toEqual(AnnotationType.WIDGET
      expect(data.comb).toEqual(false
    }
    it("should accept comb fields with a maximum length", async function () {
      textWidgetDict.set("MaxLen", 20
      textWidgetDict.set("Ff", AnnotationFieldFlag.COMB
      const textWidgetRef = Ref.get(46, 0
      const xref = new XRefMock([{ ref: textWidgetRef, data: textWidgetDict }]
      const { data } = await AnnotationFactory.create(
        xref,
        textWidgetRef,
        pdfManagerMock,
        idFactoryMock
      
      expect(data.annotationType).toEqual(AnnotationType.WIDGET
      expect(data.comb).toEqual(true
    }
    it("should only accept comb fields when the flags are valid", async function () {
      const invalidFieldFlags = [
        AnnotationFieldFlag.MULTILINE,
        AnnotationFieldFlag.PASSWORD,
        AnnotationFieldFlag.FILESELECT,
      ];
      
      
      let flags =
        AnnotationFieldFlag.COMB +
        AnnotationFieldFlag.MULTILINE +
        AnnotationFieldFlag.PASSWORD +