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/usr/share/highlight/langDefs/html.lang is in highlight-common 3.41-1.

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The actual contents of the file can be viewed below.

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Description="HTML"

Keywords={
  { Id=1,
    Regex=[[<[!?]?(?!\-\-)\/?[\w\:\-]+>?|[/?]?>]],
    Group=0,
  },
  { Id=2,
    Regex=[[([-\w]+)="]],
  },
  
  
  -- see http://stackoverflow.com/questions/1723182/a-regex-that-will-never-be-matched-by-anything
  -- workaround to fix RTF output: nested JS has more keyword definitions, add one here which is a NOP
  { Id=3,
    Regex=[[\A(?!x)x]],
  },
  { Id=4,
    Regex=[[\&\#?\w+;]],
  },
}

Strings={
  Delimiter=[["]],
  Escape=[[\A(?!x)x]] 
  -- see http://stackoverflow.com/questions/1723182/a-regex-that-will-never-be-matched-by-anything
}

Comments={
  { Block=true,
    Nested=false,
    Delimiter= { [[<!\-\-]],[[\-\->]] }
  }
}

NestedSections = {
  { Lang="php", Delimiter= { [[<\?php]], [[\?>]] } },
  { Lang="jsp", Delimiter= { [[<\%[@!\=]?]], [[.*(%>).*]] } },
  { Lang="css", Delimiter= { [[<style\s+type\=[\'\"]text\/css[\'\"]>]], [[<\/style>]] } },
  { Lang="js", Delimiter= { [[<script>]], [[<\/script>]] } },
  { Lang="js", Delimiter= { [[<script\s+language\=\"[jJ]ava[sS]cript\"(?:\s+type\=\"text\/javascript\")?>]], [[<\/script>]] } },
  { Lang="js", Delimiter= { [[<script\s+language=[\"\'][jJ]ava[sS]cript[\"\'](?:\s+type=[\"\']text/javascript[\"\'])?[^>]*>]], [[<\/script>]] } },
  { Lang="js", Delimiter= { [[<script(?:\s+type=[\"\']text/javascript[\"\'])\s+language=[\"\'][jJ]ava[sS]cript[\"\']?[^>]*>]], [[<\/script>]] } },
  { Lang="js", Delimiter= { [[<script(?:\s+type=[\"\']text/javascript[\"\'])>]], [[<\/script>]] } },
  --{ Lang="python", Delimiter= { [[\{%]], [[%\}]] } },
  --{ Lang="python", Delimiter= { [[\{\{]], [[\}\}]] } },

 --{ Lang="php", Delimiter= { [[<\?\=]], [[\?>]] } },
}

IgnoreCase=true