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Learn about the W3C validator that checks HTML and XHTML documents for well-formed markup against a DTD. Find out the history, limitations, and alternatives of this tool for web standards compliance.
Learn how to include data in-line in Web pages using the data URI scheme, a form of file literal or here document. See syntax, examples, and applications of data URIs for images, style sheets, and other resources.
A query string is a part of a URL that assigns values to specified parameters. Learn how query strings are used in web forms, indexed search, URL encoding and web frameworks.
A web beacon is a technique to track user activity on web pages and emails. Learn how web beacons work, how they are used by companies and organizations, and how the Beacon API standardizes them.
Learn how to use character entity references in XML and HTML documents to represent special characters by name or code point. See the list of standard and custom entity sets for different scripts and purposes.
A URI fragment is a string of characters that refers to a subordinate resource within a primary resource. Learn how fragments are used in different MIME types, such as HTML, XML, RDF, and media files, and how they are processed by browsers and servers.
The sample image on the right shows most of these elements: a text box asking for your name; a pair of radio buttons asking you to choose between gender values; a select box giving you a list of eye colors to choose from; a pair of check boxes to click on if they apply to you; a text area to describe your athletic ability
A web service is a software system that supports interoperable machine-to-machine interaction over a network, using XML, SOAP, WSDL and UDDI standards. Learn about the different types of web services, such as REST, AJAX, JSON-RPC, and how they are used in web applications and APIs.