Kendra Little explains page and key information in deadlock graphs and blocking chains:
1.4) Can I see the data on the page that was locked?
Well, yes. But … do you really need to?
This is slow even on small tables. But it’s kinda fun, so… since you read this far… let’s talk about %%physloc%%!
%%physloc%% is an undocumented piece of magic that will return the physical record locator for every row. You can use %%physloc%% with sys.fn_PhysLocFormatter in SQL Server 2008 and higher.
This was a very interesting read; check it out.