phrasingコンテンツ - soyjoynice @ ウィキ

a (if it contains only phrasing content)　abbr　area (if it is a descendant of a map element)
audio　b　bdi　bdo　br　button　canvas　cite　code　command　datalist
del (if it contains only phrasing content)　dfn　em　embed　i　iframe　img　input
ins (if it contains only phrasing content)　kbd　keygen　label　map (if it contains only phrasing content)
mark　math　meter　noscript　object　output　progress　q　ruby　s　samp　script　select　small
span　strong　sub　sup　svg　textarea　time　u　var　video　wbr　text

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参考：
http://www.w3.org/TR/html5/content-models.html#phrasing-content-0