This feed does not validate.
... /icon.png/</icon><id>/r/programming/.rss</id><link rel="self" href="http ...
^
line 1, column 12647: (26 occurrences) [help]
... gt;</span></content><id>t3_173viwj</id><link href="https://www.red ...
^
In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendation.
line 1, column 34863: (3 occurrences) [help]
... 0;Level&#160;3, aka “Masonry” layout</title></entry><entry><author>< ...
^