interesting...
I took the example:
<!DOCTYPE html>
<script src="https://google.github.io/wwwbasic/wwwbasic.js"></script>
<script type="text/basic">
PRINT "Hello World!"
FOR i = 1 to 10
PRINT "Counting "; i
NEXT i
</script>
and changed it from 1 to 10
to 1 to 40
and I think I broke it???