The if_search tag is a conditional tag and always used as an opening and closing pair, like this…
<txp:if_search> …conditional statement… </txp:if_search>
The tag will execute the contained statements if the called page is the result of a search.
This tag has no attributes of its own. It accepts only the global attributes .
Example 1: Select a different stylesheet during search
<txp:if_search> <link rel="stylesheet" href="<txp:css name="search" />"> <txp:else /> <link rel="stylesheet" href="<txp:css />"> </txp:if_search>
Selects a stylesheet named ‘search’ when search results are being displayed, or a stylesheet determined by the active section for normal page display.