ST version: I tested with the newest Windows 64bit version. Have not checked with other versions yet.
To see the problem, copy and paste the following lines into ST2 and save as HTML file:
<!DOCTYPE HTML>
<html>
<body>
<!----------->
<!--Facebook-->
<!----------->
<video width="320" height="240" controls="controls">
<source src="movie.mp4" type="video/mp4">
<source src="movie.ogg" type="video/ogg">
<source src="movie.webm" type="video/webm">
Your browser does not support the video tag.
</video>
</body>
</html>
You can see that, ST2 does not understand the content after
<!----------->
<!--Facebook-->
<!----------->
The syntax highlighter messes up after this comment block.
Notepad++ works well with syntax highlighter on this point.