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Cascading Style 

Sheets (CSS)

A simple mechanism for 

adding style (e.g. fonts, 

colours, spacing) to web 

documents. CSS enables 

different style elements 

to be controlled across 

an entire site or section 

of site.

Web accessibility

An approach to website 

design that enables sites 

and web applications to 

be used by people with 

visual impairment or other 

disabilities such as motor 

impairment. Accessibility 

also demands that web 

users should be able 

to use websites and 

applications effectively 

regardless of the browser 

or access platform they 

use and its settings.

Box 12.1

Which web standards should the site support?

The main standards typically followed with current versions are:

1 

Structural and semantic standards:

    HTML (www.w3.org/TR/html401)

    XHTML (www.w3.org/TR/xhtml1)

    XML (www.w3.org/TR/2000/REC-xml-20001006)