flex
grid
linear-gradient
background-image
hover
box-shadow
font-family
font-size
text-shadow
background-color
border
width
height
text-decoration
text-align
margin
padding
list-style-type
 color
position
float
>
\+
~
,
\.\B
#\D\D\D
\[
]
:nth-child
::first-letter
::first-line
:first-letter
:first-line
:first-child
:hover
:focus
:last-child
::after
::before
::marker
::selection
:active
:checked
:disabled
:empty
:enabled
:first-of-type
:in-range
:invalid
:lang
:last-of-type
:link
:not
:nth-last-child
:nth-last-of-type
:nth-of-type(n)
:only-of-type
:only-child
:optional
:out-of-range
:read-only
:read-write
:required
:root
:target
:valid
:visited
 div
</div>
</header>
</main>
</footer>