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The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7.

Octal numerals can be made from binary numerals by grouping consecutive binary digits into groups of three (starting from the right).

For example, the binary representation for decimal 74 is 1001010.

Two zeroes can be added at the left, corresponding the octal digits, yielding the octal representation 112.

ASCII, abbreviated from American Standard Code for Information Interchange, is a character encoding standard (the Internet Assigned Numbers Authority (IANA) prefers the name US-ASCII).

ASCII codes represent text in computers, telecommunications equipment, and other devices.

Most modern character-encoding schemes are based on ASCII, although they support many additional characters.

In mathematics and computing, hexadecimal (also base, or hex) is a positional numeral system with a radix, or base, of 16.

It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F (or alternatively a, b, c, d, e, f) to represent values ten to fifteen.

Hypertext Markup Language (HTML) is the standard markup language for creating web pages and web applications.

With Cascading Style Sheets (CSS) and JavaScript it forms a triad of cornerstone technologies for the World Wide Web.

Web browsers receive HTML documents from a webserver or from local storage and render them into multimedia web pages.

HTML describes the structure of a web page semantically and originally included cues for the appearance of the document.

This article aims to be an accessible introduction.

For the mathematical definition, see Decimal representation.