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<!DOCTYPE html> <html> <body> <p>In this example, we have two loops. Because there is one loop that is inside the other, we call this a nested loop. The first loop is often called an "outer loop", and the second is often called the "inner loop" because it is inside the first, outer loop.</p> <p>The outer loop executes first, and for each time the outer loop is executed, the inner loop will also execute.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var text = ""; var i, j; for (i = 0; i < 3; i++) { text += "<br>" + "i = " + i + ", j = "; for (j = 10; j < 15; j++) { document.getElementById("demo").innerHTML = text += j + " "; } } } </script> </body> </html>