element itself. If no color has been declared for the border, then itwill be the same color as the text of the element. If, on the otherhand, an element has no text -- let's say a table whichcontains only images -- then thanks to the fact that color isinherited, the border color for that table would be the text color ofits parent element. This is likely to be BODY,DIV, or another TABLE. Thus, ifan image has a border, and the BODY is its parent,given this rule:

Monday 22nd of May 2017 09:26:01 PM

CSS Style Guide

XHTML: Accessibility Tips

The library is committed to serving the entire public, and that means striving to ensure that all pages of our site are accessible to the greatest possible number of people and devices (including audio browsers, Braille readers, and other specialized browsing environments).

In addition, accessibility is now U.S. law for all government and publicly funded sites.

Education and Compliance

The following links can help you develop pages that comply with accessibility laws and guidelines:

WAI Accessibility Guidelines
These guidelines offer compliance tips, and outline various levels of compliance.
Bobby Accessibility Validator
The Center for Applied Special Technology has created this online tool that analyzes web page accessibility based on the W3C guidelines.

Accessibility and Web Standards

In a perfect world, the library’s website would be authored in XHTML 1.0 Strict, using absolutely no deprecated HTML “design” elements. Visual design would be handled via Cascading Style Sheets exclusively.

This strict separation of structure (XHTML) from style (CSS) would enable us to comply with the W3C's Priority One rating for User Agent Accessibility Guidelines 1.0, and would also vastly simplify the design, development, and maintenance of our site.

With such an approach, our site could look great in a standards–compliant browser, and yet remain accessible to virtually any known browser or Internet device.

The Bad News

Unfortunately, many web browsers used by our audience are not sufficiently CSS-compliant - over one third still use some version of Netscape 4.x. Happily, NYPL has upgraded our onsite PCs to Internet Explorer 5.5.

The Transitional Solution

In order to design sites that achieve at least a minimum of accessibility and that work well in Netscape 4, our pages must:

In addition, all XHTML and Style Sheets must validate, a simple process described on the very next page. »

« XHTML Section Index | XHTML Validation »

EM.trans {visibility: hidden; border: 3px solid gray; background: silver;
padding: 1em;}
This is a paragraph which should be visible. Lorem ipsum, dolor sit amet,
<EM CLASS="trans">consectetuer adipiscing elit, sed diam nonummy nibh </EM>
euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.
Figure 9-14

Figure 9-14. Hiding an element

Everything visible about an element -- such as content, background, and borders -- will be made invisible. Note that the

If both margins are set explicitly, and width is auto, then the value of width will be set to be whatever is needed to reach the required total (that is, the content width of the parent element). The following markup is displayed as shown in Figure 8-13:

P {margin-left: 100px; margin-right: 100px; width: auto;}
Figure 8-13

Figure 8-13. Automatic width

This is the most common case, in fact, since it is equivalent to setting the margins and not declaring anything for the