1. clipboarditem api

2. clipboarditem api: `clipboarditem()` constructor

3. clipboarditem api: gettype

4. clipboarditem api: presentationstyle

5. clipboarditem api: supports_static

6. clipboarditem api: types

7. clipboarditem api: support for `image/svg+xml` mime type.

8. clipboarditem api: support for custom formats starting with `web `.