List of HTML5 elements that can be nested inside P element?

The HTML5 spec tells us that the <p> element’s content model is phrasing content. Phrasing content is defined by the spec:

3.2.5.1.5 Phrasing content

Phrasing content is the text of the document, as well as elements that
mark up that text at the intra-paragraph level. Runs of phrasing
content form paragraphs.

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