<!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <!doctype html> <html> <head> <meta charset="utf-8"/> <title>Debugger test page</title> </head> <body> <input type="text" value=""/> <input type="button" value="Click me!" onclick="test()"/> <script type="application/javascript;version=1.7"> let output = document.querySelector("input"); output.value = ""; function test() { debugger; stepIntoMe(); // step in output.value = "dbg continue"; debugger; } function stepIntoMe() { output.value = "step in"; // step in stepOverMe(); // step over let x = 0; // step out output.value = "step out"; } function stepOverMe() { output.value = "step over"; } </script> </body> </html>