Sep 14, 2021 · Anyone is free to edit the WHATWG Wiki MetaExtensions page at any time to add a metadata name. New metadata names can be specified with the following information: Keyword. The actual name being defined. The name should not be confusingly similar to any other defined name (e.g. differing only in case). Brief description
- Is This HTML5?
- Design Notes
- Html vs XML Syntax
- Structure of This Specification
- A Quick Introduction to Html
- 0 Conformance Requirements For Authors
In short: Yes. In more length: the term "HTML5" is widely used as a buzzword to refer to modern web technologies, many of which (though by no means all) are developed at the WHATWG. This document is one such; others are available from the WHATWG Standards overview.
HTML is the World Wide Web's core markup language. Originally, HTML was primarily designed as a language for semantically describing scientific documents. Its general design, however, has enabled it to be adapted, over the subsequent years, to describe a number of other types of documents and even applications.
This specification is limited to providing a semantic-level markup language and associated semantic-level scripting APIs for authoring accessible pages on the web ranging from static documents to dynamic applications. The scope of this specification does not include providing mechanisms for media-specific customization of presentation (although default rendering rules for web browsers are included at the end of this specification, and several mechanisms for hooking into CSS are provided as part of the language). The scope of this specification is not to describe an entire operating system. In particular, hardware configuration software, image manipulation tools, and applications that users would be expected to use with high-end workstations on a daily basis are out of scope. In terms of applications, this specification is targeted specifically at applications that would be expected to be used by users on an occasional basis, or regularly but from disparate locations, with low CPU re...
For its first five years (1990-1995), HTML went through a number of revisions and experienced a number of extensions, primarily hosted first at CERN, and then at the IETF. With the creation of the W3C, HTML's development changed venue again. A first abortive attempt at extending HTML in 1995 known as HTML 3.0 then made way to a more pragmatic approach known as HTML 3.2, which was completed in 1997. HTML4 quickly followed later that same year. The following year, the W3C membership decided to stop evolving HTML and instead begin work on an XML-based equivalent, called XHTML. This effort started with a reformulation of HTML4 in XML, known as XHTML 1.0, which added no new features except the new serialization, and which was completed in 2000. After XHTML 1.0, the W3C's focus turned to making it easier for other working groups to extend XHTML, under the banner of XHTML Modularization. In parallel with this, the W3C also worked on a new language that was not compatible with the earlier H...
It must be admitted that many aspects of HTML appear at first glance to be nonsensical and inconsistent. HTML, its supporting DOM APIs, as well as many of its supporting technologies, have been developed over a period of several decades by a wide array of people with different priorities who, in many cases, did not know of each other's existence. Features have thus arisen from many sources, and have not always been designed in especially consistent ways. Furthermore, because of the unique characteristics of the web, implementation bugs have often become de-facto, and now de-jure, standards, as content is often unintentionally written in ways that rely on them before they can be fixed. Despite all this, efforts have been made to adhere to certain design goals. These are described in the next few subsections.
This specification defines an abstract language for describing documents and applications, and some APIs for interacting with in-memory representations of resources that use this language. The in-memory representation is known as "DOM HTML", or "the DOM" for short. There are various concrete syntaxes that can be used to transmit resources that use this abstract language, two of which are defined in this specification. The first such concrete syntax is the HTML syntax. This is the format suggested for most authors. It is compatible with most legacy web browsers. If a document is transmitted with the text/html MIME type, then it will be processed as an HTML document by web browsers. This specification defines the latest HTML syntax, known simply as "HTML". The second concrete syntax is XML. When a document is transmitted with an XML MIME type, such as application/xhtml+xml, then it is treated as an XML document by web browsers, to be parsed by an XML processor. Authors are reminded th...
This specification is divided into the following major sections: Introduction 1. Non-normative materials providing a context for the HTML standard. Common infrastructure 1. The conformance classes, algorithms, definitions, and the common underpinnings of the rest of the specification. Semantics, structure, and APIs of HTML documents 1. Documents are built from elements. These elements form a tree using the DOM. This section defines the features of this DOM, as well as introducing the features common to all elements, and the concepts used in defining elements. The elements of HTML 1. Each element has a predefined meaning, which is explained in this section. Rules for authors on how to use the element are also given. This includes large signature features of HTML such as video playback and subtitles, form controls and form submission, and a 2D graphics API known as the HTML canvas. Microdata 1. This specification introduces a mechanism for adding machine-readable annotations to docume...
A basic HTML document looks like this: HTML documents consist of a tree of elements and text. Each element is denoted in the source by a start tag, such as " ", and an end tag, such as " ". (Certain start tags and end tags can in certain cases be omittedand are implied by other tags.) Tags have to be nested such that elements are all completely within each other, without overlapping: This specification defines a set of elements that can be used in HTML, along with rules about the ways in which the elements can be nested. Elements can have attributes, which control how the elements work. In the example below, there is a hyperlink, formed using the a element and its hrefattribute: Attributes are placed inside the start tag, and consist of a name and a value, separated by an "=" character. The attribute value can remain unquoted if it doesn't contain ASCII whitespace or any of " ' ` = < or >. Otherwise, it has to be quoted using either single or double quotes. The value, alo...
Unlike previous versions of the HTML specification, this specification defines in some detail the required processing for invalid documents as well as valid documents. However, even though the processing of invalid content is in most cases well-defined, conformance requirements for documents are still important: in practice, interoperability (the situation in which all implementations process particular content in a reliable and identical or equivalent way) is not the only goal of document conformance requirements. This section details some of the more common reasons for still distinguishing between a conforming document and one with errors.
- 97 languages
- 200 MB
- September 23, 2002; 18 years ago
- MPL 2.0
Sep 14, 2021 · ← Index — Table of Contents — Acknowledgments →. References. References. All references are normative unless marked "Non-normative". [ABNF] Augmented BNF for Syntax Specifications: ABNF, D. Crocker, P. Overell.
Sep 16, 2021 · 4.10.1 Introduction. 184.108.40.206 Writing a form's user interface. 220.127.116.11 Implementing the server-side processing for a form. 18.104.22.168 Configuring a form to communicate with a server. 22.214.171.124 Client-side form validation. 126.96.36.199 Enabling client-side automatic filling of form controls.
3 days ago · An HTML element is a type of HTML (Hypertext Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). [vague] HTML document is composed of a tree of simple HTML nodes, such as text nodes, and HTML elements, which add semantics and formatting to parts of document (e.g., make text bold, organize it into paragraphs, lists and ...
Sep 14, 2021 · The dns-prefetch keyword may be used with link elements. This keyword creates an external resource link.This keyword is body-ok.. The dns-prefetch keyword indicates that preemptively performing DNS resolution for the origin of the specified resource is likely to be beneficial, as it is highly likely that the user will require resources located at that origin, and the user experience would be ...