vim function for correct expansion in html and css

I found this function online its not mine.(lines with # I have attempted to add to script)
This function fixed correct expansion in html so for example

<div>|</div> expands to

<div>
|
</div>

But in css it still incorrectly expands

so this is the current default behaviour
#myid {
|}

How can I get it to be?

#myid {
|
}

function! Expander()
64 let line = getline(".")
65 let col = col(".")
66 let first = line[col-2]
67 let second = line[col-1]
68 let third = line[col]
69
70 if first ==# ">"
71 if second ==# "<" && third ==# "/"
72 return "\<CR>\<C-o>==\<C-o>O"
73
74 else
75 return "\<CR>"
76
77 endif
78 # else if first ==# "{"
79 # if second ==# "}"
80 # return "\<CR>\<C-o>==\<C-o>O"
81
82 else
83 return "\<CR>"
84
85 endif
86
87 endfunction

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