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/usr/share/source-highlight/html_simple.lang is in libsource-highlight-common 3.1.8-1.2.

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# this contains only html stuff, no javascript nor css
# thus it can be used for inclusions in contexts such as javadoc
# to avoid possible recursion problems
# e.g., html uses javascript which uses doxygen which uses html...

vardef SPECIAL=
'(([sS][tT][yY][lL][eE])|(([nN][oO])?[sS][cC][rR][iI][pP][tT])|'+
'([xX][mM][pP])|([iI][fF][rR][aA][mM][eE])|'+
'([nN][oO][eE][mM][bB][eE][dD])|([nN][oO][fF][rR][aA][mM][eE][sS]))'

vardef SPECIAL2=
'(([tT][iI][tT][lL][eE])|([tT][eE][xX][tT][aA][rR][eE][aA]))'

# we need to treat these differently because these elements
# can't contain elements and entities
# however, they can have attributes so we need to use
# nested states
# example <style foo="bar"> &amp; <br> not highlighted </style>
state keyword = '<'+$SPECIAL begin
    include "key_string.lang"
    state keyword = '>' begin
    	keyword = '</'+$SPECIAL+'>' exit 2
		normal = '[^<[:blank:]]+'
	end
end

# title and textarea are similar, but entities are allowed
state keyword delim '<'+$SPECIAL2+'>' '</'+$SPECIAL2+'>' multiline begin
	preproc = '&([[:alnum:]]+);'
	normal = '[^<[:blank:]]+'
end

# if we encounter <plaintext> everything else (up to the end of file)
# will be highlighted as normal
state keyword = '<[pP][lL][aA][iI][nN][tT][eE][xX][tT]>' begin
	normal = '.+'
end

include "xml.lang"

keyword = '<(/)?[[:alpha:]][[:alnum:]]*(/)?>'

state keyword delim '<(/)?[[:alpha:]][[:alnum:]]*' '(/)?>' multiline begin
	include "key_string.lang"
end