While <pre> HTML tag blocks are allowed in both commonmark specification and commonmark-java, for some reason, webrtc.googlesource.com using gitiles doesn't render that block. [1] It's probably because of the stricter conditions of the gitiles HTML extension. [2] So use a much more portable code block syntax (triple backticks). [1] https://webrtc.googlesource.com/src/+/5900ba0ee8f3f9cef3b29becbb4335b8f440d57d/api/g3doc/threading_design.md [2] https://gerrit.googlesource.com/gitiles/+/f65ff3b7bfc36f8426aa0199220b111e14ff92ee/java/com/google/gitiles/doc/GitilesHtmlExtension.java#32 Bug: None Change-Id: Ie83bbb7e26dec5225cd79b926b97529e33a37149 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/225360 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34433}