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From the tag omission rules in the ED[1]: * rb, rtc, and rp auto-closes if immediately followed by rb, rt, rtc, or rp * rt auto-closes if immediately followed by rb, rt, or rp Issues are: 1. rtc should not auto-close if immediately followed by rt 2. rt should auto-close if immediately followed by rtc The tests Robin wrote[2] confirm that <rt> does not auto-close <rtc> [1] http://www.w3.org/html/wg/drafts/html/CR/syntax.html#syntax-tag-omission [2] https://github.com/html5lib/html5lib-tests/pull/27/files
You are entirely correct, they were inverted. This has been fixed, thanks!