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(borderStyle.horizontalCornerRadius).toEqual(0
    }
    it("should set and get a valid vertical corner radius", function () {
      const borderStyle = new AnnotationBorderStyle(
      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 () {
      dict = new Dict(
      ref = Ref.get(1, 0
    }
    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