Argument 'stylemark--' is not a function, got undefined

[alessandro308]

The following code generates Argument 'stylemark--' is not a function, got undefined

\```checkbox-required-example.html
<form name="exampleForm">
   <checkboxes...>
   ...
</form>

\```
\```checkbox-required-example.angularjs
console.log(exampleForm);

\```

Of course, the slash before the backticks has been added here to escape them.

Any idea how to solve it?