Template for running markup after a while. all the markup between
the <after> and matching </after> tags are remembered. After
"ms" msec have elapsed (defaults to 100), the remembered markup
is processed using (almost) the rewrite context that was in effect
when the <after> tag was recognized. A copy of the request
properties is made, but all other property lists are shared.
- <after ms=n [eval=true|false]>
If "eval" is specified, then ${..} substitutions are performed on all
content before it is processed. The <after> tags can nest.
The output from the processing is discarded, this element is used
for it's side effects.