Selectors in DHTML

Three types of Selectors

• HTML selectors - the text portion of an HTML tag
• Class selectors - allows setting up of a class which can be applied to multiple HTML tags
• ID selectors - like class selectors but usually applied only once on a page to a particular HTML tag

In the example below IMG is the selector and SRC is an attribute of that IMG selector.

IMG SRC="picture.gif"

Note that the BR, FRAMESET and FRAME tags cannot be used as selectors.

Three types of HTML tags

• Block level tags have line breaks before and after
• Inline tags have no associated line breaks
• Replaced tags have set or calculated dimensions (width and height)