This is a simple example of two fe-fields pre-filled via mpad-syntax. Look at the source of the HTML-File.

1. The fe.min.js is included in head.
2. Two canvas elements are embedded.
3. In a Javascript-block at the end of file these canvas elements are used with the fe.FE-constructor to turn them into fe-panels and init with the formulas.

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Example:

This is an initially empty formula field:

 

This field is pre-filled: