Unobtrusive Javascript
Javascript is a wonderful tool to enhance the usability of web sites. It is the extra layer above the mark-up “what is this text” and the CSS “how should it be displayed”. Javascript adds a new dimension, the “how should this element behave”.
On the following pages we will discuss and see how we can use Javascript, but still maintain accessibility. The technique to completely separate Javascript from the other two layers of web development has become commonly named “unobtrusive Javascript”, as “accessible Javascript” does not quite cut it. You can have a perfectly separated Javascript and still be totally inaccessible.