I am considering building a website using php to deliver different html depending on browser and version. A question that came to mind was, which version would crawlers see? What would happen if the content was made different for each version, how would this be indexed?
I am considering building a website using php to deliver different html depending on
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The crawlers would see the page that you have specified for them to see via your user-agent handling.
Your idea seems to suggest trying to trick the indexer somehow, don’t do that.