Sergey Biryukov 0e26adbaea Comments: Add rel="nofollow ugc" attribute to links in comments.
UGC stands for User Generated Content, and the `ugc` attribute value is recommended for links within user generated content, such as comments and forum posts.

See https://webmasters.googleblog.com/2019/09/evolving-nofollow-new-ways-to-identify.html.

Props audrasjb, joostdevalk, dkarfa, SergeyBiryukov.
Fixes #48022.

git-svn-id: https://develop.svn.wordpress.org/trunk@46349 602fd350-edb4-49c9-b593-d223f7449a82
2019-09-30 01:29:10 +00:00
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