508验证的检查条目

(a) A text equivalent for every non-text element shall be provided (e.g., via “alt”, “longdesc”, or in element content).

非文字项目必须有文字说明(如 alt,longdesc等)

(b) Equivalent alternatives for any multimedia presentation shall be synchronized with the presentation.

多媒体也必须有文字说明

(c) Web pages shall be designed so that all information conveyed with color is also available without color, for example from context or markup.

没有颜色的时候，页面也是可读的

(d) Documents shall be organized so they are readable without requiring an associated style sheet.

没有样式表的页面也是可读的。（可以试一下用firefox或者opera的author mode来看看你的页面在没有样式表的情况下是什么德行。。。）

(e) Redundant text links shall be provided for each active region of a server-side image map.

图片热点链接的map要有说明文字。

(f) Client-side image maps shall be provided instead of server-side image maps except where the regions cannot be defined with an available geometric shape.

(g) Row and column headers shall be identified for data tables.

(h) Markup shall be used to associate data cells and header cells for data tables that have two or more logical levels of row or column headers.

(i) Frames shall be titled with text that facilitates frame identification and navigation.

(j) Pages shall be designed to avoid causing the screen to flicker with a frequency greater than 2 Hz and lower than 55 Hz.

(k) A text-only page, with equivalent information or functionality, shall be provided to make a web site comply with the provisions of this part, when compliance cannot be accomplished in any other way. The content of the text-only page shall be updated whenever the primary page changes.

(l) When pages utilize scripting languages to display content, or to create interface elements, the information provided by the script shall be identified with functional text that can be read by assistive technology.

(m) When a web page requires that an applet, plug-in or other application be present on the client system to interpret page content, the page must provide a link to a plug-in or applet that complies with §1194.21(a) through (l).

(n) When electronic forms are designed to be completed on-line, the form shall allow people using assistive technology to access the information, field elements, and functionality required for completion and submission of the form, including all directions and cues.

(o) A method shall be provided that permits users to skip repetitive navigation links.

(p) When a timed response is required, the user shall be alerted and given sufficient time to indicate more time is required.

或者换个说法

Check read order of content by removing style sheets and tables, linearizing the page or by using a text-only browser like Lynx

Enlarge the text and resize the window

Check for color by looking at content in grey scale

Check images for valid and relevant text descriptors

Check if all activities on the page can be done from the keyboard. Example, form elements, navigation links and other interactive elements are not dependent on the mouse

Check to see if links make sense out of context

Check if form elements are associated with the label using tag. This can be done by clicking on the text label for the field. If it is done correctly cursor will appear in the associated field.

Check all video and audio content for captions or text descriptors