Browser

The program with which you view the word wide web.

Decimal number

A base ten digit, 0-9 or a number in base 10. The standard number system.

Entity

A encoded character. Uses the form &text; or &#DECIMAL; &#xHEXNUM; HEXNUM in this case is a hexidecimal digit number and DECIMAL is a decimal digit number.

Hexidecimal number

A number in base 16 format, the digits are usually 0-9 and A-F. Although lowercase letters are allowed it is bad form in most books. Decimal "10" is Hex "A", Hex "F" is Decimal "15", Hex "10" is Decimal "16" and Hex "FF" is Decimal "256".

HTML

HyperText Markup Language

Source

The text document that a browser interpets for HTML and displays.

Viewsource

A feature of most browsers that allows you to view the HTML source that makes up the page. Great for learning since anything you like on the we you can learn how to do from the HTML source.