CSS question: id == class?

Xah Lee

In CSS, what's the difference between "id=" and "class="?

i thought id is CSS2 version equivalent for a shorter name. But
apparently if i replace class with id on a webpage they don't work...
thanks.

Xah
xa*@xahlee.org
http://xahlee.org/PageTwo_dir/more.html

Jul 20 '05 #1

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Bjoern Hoehrmann

* Xah Lee wrote in comp.text.xml:

In CSS, what's the difference between "id=" and "class="?

http://css-discuss.incutio.com/?page=ClassesVsIds
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Björn Höhrmann · mailto:bj****@hoehrmann.de · http://bjoern.hoehrmann.de
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Jul 20 '05 #2

Peter Flynn

Xah Lee wrote:

In CSS, what's the difference between "id=" and "class="?

i thought id is CSS2 version equivalent for a shorter name. But
apparently if i replace class with id on a webpage they don't work...
thanks.

ID values must be unique per document. They identify a single object.
That's why they're called "IDs".

Class values can occur arbitrarily.

///Peter
--
"The cat in the box is both a wave and a particle"
-- Terry Pratchett, introducing quantum physics in _The Authentic Cat_

Jul 20 '05 #3

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