The "hello world" program is a simple program used to demonstrate the basic syntax of a programming language. In HTML, the "hello world" code would look like this:

Hello World!

This code creates a basic HTML document with a title and a heading that says "Hello World!".

In JavaScript, the "hello world" code would look like this:

console.log("Hello World!");

This code uses the console.log() function to print the message "Hello World!" to the console. When executed, the message will appear in the console window of the browser or the console of the development environment.