HTML 5 Preview
|
<br />Original: http://www.alistapart.com/articles/previewofhtml5 By Lachlan Hunt Translated by: zhaozy in 3user.com Summary <br />The web is constantly evolving. New and innovative websites appear every day, pushing the boundaries of HTML in every way. HTML 4 has been with us for almost 10 years, and publishers continue to seek new technologies that offer greater functionality, but often find themselves in a difficult situation due to the constraints of markup languages and browsers. To provide authors with more flexible, interoperable, interactive, and exciting websites and applications, HTML 5 introduces and enhances a range of features, including form controls, application programming interfaces (APIs), multimedia, structured and semantic. Work on HTML 5, which began in 2004, is now being fully implemented through the joint efforts of the W3C HTML WG and the WHATWG. Many key players are involved in the W3C effort, most notably the four major browser vendors: Apple, Mozilla, Opera, and Microsoft; as well as a range of other organizations and individuals with different interests and expertise. The work on writing the detailed specification is still ongoing and is a long way from being complete. Likewise, the features discussed in this article are subject to change in the future. This article is just an outline of some of the main features in the current draft. structure HTML 5 introduces a whole new set of elements to make it easier to build web pages. Most HTML 4 based pages contain a number of common structures, such as a header, footer, and columns. Currently, we usually mark these blocks with div elements and define a descriptive id or class for them.  The diagram shows a typical 2-column layout using div elements with id and class attributes. It includes a header and footer, a horizontal navigation bar below the header, and the main content includes articles and a sidebar to the right. The extensive use of div elements is due to the lack of clear semantics in the current HTML 4 version to describe these blocks. HTML 5 introduces new elements to represent these different blocks.  Those div elements can be replaced by new elements: header, nav, section, article, aside and footer. <body> <header>...</header> <nav>...</nav> <article> <section> ... </section> </article> <aside>...</aside> <footer>...</footer> </body> There are several advantages to using these new elements (compared to HTML 4). When used with heading elements (h1 - h6), they can mark up nested levels of section headings, beyond the six levels in previous versions of HTML . The specification includes a detailed algorithm for generating an outline. This takes into account structuring these contents while still being backwards compatible with previous versions. This allows for the generation of a table of contents in editing tools and browsers to help users navigate the document. For example, the following markup structure uses nested section and h1 elements: <section> <h1>Level 1</h1> <section> <h1>Level 2</h1> <section> <h1>Level 3</h1> </section> </section> </section> Note that, for better compatibility with current browsers, it is also possible to use other heading elements (h2 - h6) instead of h1 elements in appropriate locations. By identifying the exact purpose of sections within a page using specific section elements, assistive technologies can help users navigate the page more easily. For example, they can skip navigation blocks without much effort or quickly jump from one article to the next without the need for the author to provide jump links. For authors, removing redundant divs from a document and replacing them with more obvious elements makes source code clearer and easier to write. Previous Page 1 2 3 4 Next Page Read Full Article |
<<: MySQL 8.0.23 installation super detailed tutorial
>>: React implements infinite loop scrolling information
Recommend
js to achieve a simple lottery function
This article shares the specific code of js to im...
A detailed introduction to the basics of Linux scripting
Table of contents 1. Script vim environment 2. Ho...
In-depth explanation of Set and WeakSet collections in ES6
Table of contents Set is a special collection who...
CSS performance optimization - detailed explanation of will-change usage
will-change tells the browser what changes will h...
Practical method of deleting a row in a MySql table
First, you need to determine which fields or fiel...
Implementation of new issues of CSS3 selectors
Table of contents Basic Selector Extensions Attri...
Detailed tutorial on deploying Springboot or Nginx using Kubernetes
1 Introduction After "Maven deploys Springbo...
How to keep running after exiting Docker container
Phenomenon: Run an image, for example, ubuntu14.0...
Detailed explanation of the idea of xshell remote login to CentOS7 without password login
First, let me talk about the general idea: 1. Log...
How to manually scroll logs in Linux system
Log rotation is a very common function on Linux s...
How to manually upgrade the node version under CentOs
1. Find the corresponding nodejs package, refer t...
How does Vue implement communication between components?
Table of contents 1. Communication between father...
Detailed analysis of when tomcat writes back the response datagram
The question arises This question arose when I wa...
A simple example of how to implement fuzzy query in Vue
Preface The so-called fuzzy query is to provide q...
VMware virtual machine installation Apple Mac OS super detailed tutorial
Table of contents Summarize Sometimes we need to ...