This is a first level heading in HTML. With CSS, I will turn this into red color

This is a second level heading in HTML. With CSS, I will turn this into blue color

This is a third level heading in HTML. With CSS, I will turn this into green color

This is a paragragh As you can see, I placed an empahisis on the word "paragraph". Now, I will change also the background color of the word "paragraph" to black, and its text color to green, all with just CSS.

The main essence of this tutorial is to:

Show you how to format a web document with HTML
Show you how to design a web page with CSS
Show you how to program a web document with JavaScript

Next, I am going to add the following two numbers and display the result, all with JavaScript

First number:

Second number:

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