When using JavaScript with HTML, the JavaScript code can be placed in a <script> tag in the header or as a <script> tag in the body (not recommended). An alternative will be to linking it to a <script> tag in the header as an external file. This is highly recommended as some javascript code can go beyond 100-200 lines. These files usually have a .js extension and will get cached by the browser. The code below contains a simple program that print "Hello" to the console in the terminal.