Yes and no.<p>The repetitions would have to appear within 32KB of each other to be captured in the DEFLATE window [1] which, given that a lot of pages can be 100s of KBs of <i>uncompressed</i> text, may make that impossible.<p>Additionally, the zlib (or whatever) compression settings would have to be set aggressively enough to identify those duplicates as the best run-lengths to encode.  Since GitHub is generating a lot of this live and delivering with low TTFB, they may be using a less aggressive than necessary setting.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;DEFLATE#Duplicate_string_elimination" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;DEFLATE#Duplicate_string_elimi...</a>