To insert a matrix widget, press the button or type Ctrl-, or Ctrl-.. Add rows by pressing Ctrl-. and columns with Ctrl-,. Use Enter to traverse the table in columns, and Tab to traverse the table in rows. Arrow keys navigate the table too. Entering and exiting the table works with the arrow keys or the tab/shift-tab keys.

To insert an integer widget, click the button. If you have an integer selected, it will be the default. Use arrow keys to navigate through the widget.

The graph editor widget is an example from d3.js. Click to insert a vertex. Click close to other vertices to insert edges.

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See the code for this on GitHub.