<bmx-signature-pad>
A signature, drawn with a pen, a mouse or a finger, that goes into a form like any other field.
Nothing is sent anywhere: the form's value is shown here instead.
Stored as strokes, drawn back
With format="json" the value is the strokes themselves; setting it draws them again. This one is read-only.
Every property, event and method: https://docs.binarymission.co.uk/webcomponents/bmx/bmx-signature-pad.html