how can we run a program

Answer 1

Use javascript.

<script>
//your code here
</script>

Answer 2

u can check ur browser without internet, if type the correct request u get easily

Answer 3

web browser can run your program saved with extension .html etc.

Answer 4

<script>alert("bruh! lel!");</script

Answer 5

but put a </> after the </script>

Answer 6

see event jquery doc api, also http://w3schools.com examples