4.4. W3C HTML event

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HTML is a universal markup language on Web.

4.4.1. HTML tutorial

To learn more about HTML, please read our HTML tutorial.

4.4.2. HTML version

HTML 2.0

HTML 2.0 was developed by the HTML working Group of the Internet Engineeringworking Group in 1996.

HTML 2.0 is an outdated version of HTML. The browsers currently available onthe market rely on newer versions of HTML. For a WEB developer, there is noneed for the HTML 2.0 standard.

HTML 3.2

HTML 3.2 was released as a W3C standard on January 14, 1997. HTML 3.2 adds widely used features such as fonts, tables, applets, text streams around images, superscripts and subscripts to the HTML 2.0 standard.

One of the elements added to the 1997 HTML 3.2 standard-the < font > tag-creates unnecessary hassle for the important task of separating HTML contentfrom presentation.

HTML 4.0

As a W3C recommendation, HTML 4.0 was released on December 18, 1997. The second version, with only a few editorial revisions, was released on April 24, 1998.

The most important feature of HTML 4.0is the introduction of style sheets (CSS).

Our W3C CSS chapter summarizes W3C CSS activities.

HTML 4.01

As a W3C recommendation, HTML 4.01 was released on December 24, 1999.

HTML 4.01 is a minor update to HTML 4.0 with fixes and bug fixes.

The W3C will not continue to develop HTML. In the future, W3C’s work will focus on XHTML.

XHTML 1.0 (the latest version of HTML)

XHTML 1.0 uses XML to rerepresent HTML 4.01.

As a W3C recommendation, XHTML 1.0 was released on January 20, 2000.

Our W3C XHTML chapter summarizes W3C XHTML activities.

HTML 5

The W3C released the working draft of HTML 5 on January 22, 2008.

HTML 5 improves interoperability and reduces development costs by laying down precise rules for how to handle all HTML elements and how to recover from errors.

New features in HTML 5 include the ability to embed audio, video and graphics, client-side data storage, and interactive documents.

HTML 5 also contains new elements, such as < nav >, < header >, < footer >, and

, and so on.

The HTML 5 working group includes: AOL, Apple, Google, IBM, Microsoft, Mozilla, Nokia, Opera, and hundreds of other vendors.

4.4.3. W3C HTML specification and timeline

Standard

Recommend

HTML 3.2

January 14, 1997

HTML 4.0

May 24, 1998

HTML 4.01

December 24, 1999

HTML 5

June 24, 2010 (latest draft)

You’ll find information about the XHTML specification and timeline in the next section.

《地理信息系统原理、技术与方法》  97

最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。