RSP shall escape $ to prevent Dart from interpreting it.

[tomyeh]

For example,

<script>
$("#foo").show();

</script>

On the other hand, to generate dynamic content (based on run-time variables), [= expr ] shall be used instead. It also means if you ever use $ to generate dynamic content, you shall replace it with [= expr].

[tomyeh]

Fixed in c02a1d6