When specifying a length, we must include one of the many different unit systems offered by CSS. The three categories of lengths - relative, absolute, and percentages.
Relative lengths are relative to their containing element, or a certain property. This is useful because it allows your content to scale according to the surrounding elements' settings.
Note: The viewport is the length and width of the current viewing size of one's browser window.
Absolute lengths do not depend on any other elements.
These give web designers the ability to give a precise length to any element.
The most popular absolute length is the pixel, which is a single dot on the computer screen.
For example, screens with a 1280x720 resolution means it has 921600 small pixels that show the display. Each dot changes color depending on what you're viewing. Specifying a length in pixels (px) allow for designers to be very precise in how much space their text makes up.
Additionally, there are print lengths that can be used, but rarely are. These include points, inches, centimers, millimeters and picas. These are mainly used in print media, and web developers rarely use them.
Congratulations! You have just finished CSS Fundamentals. Get up, take a stretch and pat yourself on the back. Now let's move onto CSS Text section! :-)
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