Comments that don't have a space between "%" and "#" get ignored.
Example input:
<%# A comment WITHOUT a space after percent sign - this gets ignored %>
<% # A comment WITH a space after percent sign - this gets converted to HAML %>
Output of html2haml from the above:
- # A comment WITH a space after percent sign - this gets converted to HAML
Tested with html2haml 2.0.0 and ruby 2.3.1p112