Server side includes are processed on the server side whereas ideas of "cross-browser" or mobile devices are issues of client side. For instance, if you had an SSI like:
<!--#include file="mainCats.shtml" -->
It's not going to be rendered to the browser-mobile or otherwise, like that. If your webserver is configured correctly to use SSI, then it will take the output of mainCats.shtml and render the output to the client. The client is none the wiser.
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