XHTML

Question

How can I add new tags to the xhtml document without making the markup 'invalid'?

for eg:

instead of <span class="time"> I'd like to use <time>. Is this possible? because I've seen a facebook app do something like this.

x0n · Accepted Answer

You need to declare a new namespace for your invented elements:

<html xmlns:foo="urn:my-namespace">
...
<foo:time>...</foo:time>

or

<html>
...
<time xmlns="urn:my-namespace">...</time>

Of course, this isn't going to make an ounce of sense to your browser but I presume you have good reasons to want to do this.

XHTML - adding new elements