The printfooter is a (on-screen) hidden div which contains a permalink to the revision a page was generated from — for example:
<div class="printfooter"> Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Main_Page&oldid=1093586708" class=" nonimage">https://en.wikipedia.org/w/index.php?title=Main_Page&oldid=1093586708</a>" </div>
Google sometimes appears to pick this up in the SERP snippet, which reduces the amount of useful content displayed and looks a little "messy".
We can use data-nosnippet (ref) to hint to Google to not include this content.
<div class="printfooter" data-nosnippet> Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Main_Page&oldid=1093586708" class=" nonimage">https://en.wikipedia.org/w/index.php?title=Main_Page&oldid=1093586708</a>" </div>
