Validate Your Website’s HTML and xHTML Markup!

W3C Markup Validation Service

W3C Markup Validation Service

W3C CSS Validation Service

W3C CSS Validation Service

With the increasing compliance by browser vendors to adhere to (some) of the W3C document and CSS standards, it is ever-increasingly important to use markup ([tags|Informally, HTML elements are sometimes referred to as tags, though many prefer the term tag strictly in reference to the markup delimiting the start and end of an element.]), attributes, and coding practices that adhere to these standards as well.

Specifying [document type|A Document Type Declaration, or DOCTYPE, is an instruction that associates a particular SGML or XML document with a Document Type Definition. In the serialized form of the document, it manifests as a short string of markup that conforms to a particular syntax.] and [character encoding|A character encoding system consists of a code that pairs each character from a given repertoire with something else, such as a sequence of natural numbers, octets or electrical pulses, in order to facilitate the transmission of data (generally numbers and/or text) through telecommunication networks or storage of text in computers.] and using supported [tags|Informally, HTML elements are sometimes referred to as tags, though many prefer the term tag strictly in reference to the markup delimiting the start and end of an element.] and attributes for the version of [HTML|HTML, which stands for Hypertext Markup Language, is the predominant markup language for web pages. It provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists etc as well as for links, quotes, and other items. It allows images and objects to be embedded and can be used to create interactive forms. It is written in the form of HTML elements consisting of tags surrounded by angle brackets within the web page content. It can include or can load scripts in languages such as JavaScript, which affect the behavior of HTML processors like Web browsers, and Cascading Style Sheets (CSS) to define the appearance and layout of text and other material. The use of CSS is encouraged over explicit presentational markup.] (4.01) or [xHTML|The Extensible Hypertext Markup Language, or XHTML, is a markup language that has the same depth of expression as HTML, but also conforms to XML syntax.] (1.0 or 1.1 Transitional or Strict) not only increases the likelihood of your [pages rendering|A layout engine, or rendering engine, is software that takes marked up content (such as HTML, XML, image files, etc.) and formatting information (such as CSS, XSL, etc.) and displays the formatted content on the screen. It paints on the content area of a window, which is displayed on a monitor or a printer. A layout engine is typically used for web browsers, e-mail clients, or other applications that require the displaying (and editing) of web contents.] properly and bug-free across multiple [browsers|A web browser is a software application for retrieving, presenting, and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier (URI) and may be a web page, image, video, or other piece of content. Hyperlinks present in resources enable users to easily navigate their browsers to related resources. Although browsers are primarily intended to access the World Wide Web, they can also be used to access information provided by web servers in private networks or files in file systems. The major web browsers are Windows Internet Explorer, Mozilla Firefox, Apple Safari, Google Chrome, and Opera.] and operating platforms, but also aide in your website’s ability to be [indexed|Search engine indexing collects, parses, and stores data to facilitate fast and accurate information retrieval. Index design incorporates interdisciplinary concepts from linguistics, cognitive psychology, mathematics, informatics, physics and computer science. An alternate name for the process in the context of search engines designed to find web pages on the Internet is Web indexing.] by [spiders and crawlers|A Web crawler is a computer program that browses the World Wide Web in a methodical, automated manner. Other terms for Web crawlers are ants, automatic indexers, bots, and worms or Web spider, Web robot, or – especially in the FOAF community – Web scutter] and is the most important step in organic [search engine optimization|Search engine optimization (SEO) is the process of improving the volume or quality of traffic to a web site from search engines].

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