I’m new to vaadin and considering building a new web application using vaadin. Does vaadin has any builtin UI component to support MathML?
There is no direct support for MathML.
Vaadin has been build to be easily extensible, see
the documentation
on how to create a custom components for Vaadin.
If you end up creating a MathML widget for Vaadin and would like to contribute it back to the project, it would be greatly appreciated.