An accessible web site is a web site that can be used by disabled users.
便于访问的网站可以被残疾人士很好地使用。

Disabled users are users with disabilities or bad user conditions.
残疾人指的是哪些身体残疾或是浏览条件较差的用户。

The Web Accessibility Initiative - WAI
网页自发访问 - WAI

WAI (created by the World Wide Web Consortium (W3C) in 1997) is a set of guidelines intended for web developers, authors, and designers- about how to make web content accessible to people with disabilities.
WAI（由万维网联盟于1997年创建），它是提供给网络开发者、作者和设计师所使用的一组指导方针 — 关于如何使残障人士更容易访问网页。

The goal of these guidelines is accessibility, but they will also help make web contents available to more browsers (voice browsers, cell phones, hand-held devices), and to more users working in difficult environments (hands-free, strong light, darkness, bad sight, heavy noise).
这个指导方针的主要目标是提高可访问性。它们也将使得更多类型的浏览器（发声浏览器、手机、掌上设备）能够读取网页内容，并且使得那些困难环境下（免提、强光、昏暗、光线较差、噪音）的人能够阅读网页内容。

Is WAI Important to Your Web Site?
WAI对于你的网站来说很重要吗？

Yes it is.
是的，非常重要。

Millions of people with disabilities are surfing the Internet every day, and even more millions are using poor browser equipment, or working under difficult user environments.
你要知道，成千上万的残障人士每天都在上网，甚至更多的人位于恶劣的浏览环境和困难的工作环境。

If your website lacks features such as resizable fonts, images with proper text descriptions, and easy navigation, these people will not be able to access your information.
如果你的网站缺少下列特性：自由改变字体尺寸、清晰的图像描述、简便的导航系统，那么，上述那些人就很难访问到你的信息。

In fact: Your site violates the rights of these people.
事实上：你的网站剥夺了这些人享有信息的权利。

Here are some other reasons for making your site more accessible:
下面还有一些理由能够说明你必须提高网站的可访问性：

• It will improve your reputation and image
  它将提高你的名声和映像
  
• It will improve your customer satisfaction
  它将提升你的消费者满意度
  
• It will increase your number of visitors
  它将提高你的访问者数量
  
• It will let your visitors stay longer at your site
  它将使访问者增加在你网站的停留时间
  
• It will increase the number of returning visitors
  它将增加你的回头客户
  
• It will make your site more usable also for people with no disabilities
  它将使得非残障人士更好地使用资源
  
• It will make your site more usable for users with images turned off
  它将使你的网站在关闭图像显示的情况下变得更为有用
  
• It will make your site more usable for people with older equipment
  它将是你的网站对于那些显示设备较差的人来说更具备可用性
  
• It will let you reach the fastest growing population: older people
  它将能够使你研究那些快速增长的用户群：老年人群

Use an Adjustable Font Size
使用可供调节的字体尺寸

Use only relative font sizes, and let the user be able to use the browser menu (View - Text Size) to change the default text size.
使用相对字体尺寸，并且允许用户使用浏览器菜单（查看 - 字体大小）来改变默认的字体尺寸。

看下面这些案例：
Can you read this?

Can you read this?

Can you read this?

Can you read this?

To change the font size, select view - text size - in your browsers menu.
你可以选择浏览器菜单中的“查看 — 字体大小”来改变字体尺寸。

Use The "alt" Attribute
使用“Alt”属性

The alt attribute allows you to provide a text equivalent for an image (and for some other elements).
alt 属性允许你提供图象的文本说明（或者是其它元素的说明）

Example:
案例：

<img src="images/bana.jpg" alt="Banana" />

Sometimes a web browser will not display your images. The reason could be one of many:
有时，网络浏览器并不显示你的图像，原因可能下面的其中一个：

• The user has turned off the display of images
  用户关闭了图像显示
  
• The browser is a mini browser without image display.
  浏览器是迷你浏览器，不具备图像显示功能
  
• The browser is a voice browser (used by blind or poor-sighted)
  浏览器是一个发声浏览器（供弱视人群使用）

If you use the "alt" attribute, most browsers will at least display or read the "alt" description.
如果你使用了“alt”属性，大多数浏览器至少会显示或读取 “alt ” 的描述信息。

Web 易读性 Web 国际化

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