[rb](https://html.spec.whatwg.org/multipage/obsolete.html#rb) and [rtc](https://html.spec.whatwg.org/multipage/obsolete.html#rtc) are currently listed as [non-conforming features](https://html.spec.whatwg.org/multipage/obsolete.html#non-conforming-features), which means they're "entirely obsolete, and must not be used by authors". -- GitHub Notification of comment by xfq Please view or discuss this issue at https://github.com/w3c/i18n-activity/issues/220#issuecomment-508929038 using your GitHub accountReceived on Saturday, 6 July 2019 14:05:45 UTC
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