Your code might contain syntax errors, or logical errors, that are difficult to diagnose.
With a debugger, it becomes easy to set breakpoints and examine variables while the code is executing.
<` !DOCTYPE html>
<h1>My First Web Page</h1>
Activate debugging in your browse by pressing F12, and select "Console" in the debugger menu.
a = 5;
b = 6;
c = a * b;