/usr/share/vim/vim80/syntax/htmlm4.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | " Vim syntax file
" Language: HTML and M4
" Maintainer: Claudio Fleiner <claudio@fleiner.com>
" URL: http://www.fleiner.com/vim/syntax/htmlm4.vim
" Last Change: 2001 Apr 30
" quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif
" we define it here so that included files can test for it
if !exists("main_syntax")
let main_syntax='htmlm4'
endif
runtime! syntax/html.vim
unlet b:current_syntax
syn case match
runtime! syntax/m4.vim
unlet b:current_syntax
syn cluster htmlPreproc add=@m4Top
syn cluster m4StringContents add=htmlTag,htmlEndTag
let b:current_syntax = "htmlm4"
if main_syntax == 'htmlm4'
unlet main_syntax
endif
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