# Pastebin HjhsQfdi
1. HTML Standard, Edge: no special treatment
2. W3C HTML 5.1, Gecko: rb and rtc get implied end tags and map to HTMLElement
3. W3C HTML 5.0, WebKit: like (2) except rp causes an implied end tag for rtc
4. Blink: like (2) except rb and rtc map to HTMLUnknownElement