The full list of changes can be seen on the [6.2.0
milestone](https://github.com/jupyter/nbconvert/milestone/21?closed=1)
- Add the ability to fully customize `widget_renderer_url`
[1614](https://github.com/jupyter/nbconvert/pull/1614)
- Enable users to customize MathJax URLs [1609](https://github.com/jupyter/nbconvert/pull/1609)
- Add CLI configuration for disable-chromium-sandbox
[1625](https://github.com/jupyter/nbconvert/pull/1625)
- Enables webpdf to be rendered with templates
[1601](https://github.com/jupyter/nbconvert/pull/1601)
- Adds dejavu [1599](https://github.com/jupyter/nbconvert/pull/1599)