z-index for space span
fake space detection
manpage

option to break ligatures
check if we can add information to the font, and let browsers show ligatures automatically

use absolute positioning for long whitespace
solution/workaround for latex math fonts

wiki page
- why the html looks ugly : use a modern web browser, use Linux/Mac, (enabling ClearType for Windows XP)
- why got incorrect text after copy&paste : try ligature or always-apply-unicode
- why text are so small : set --zoom or zoom in the page
- why images are blurred : set higher dpi

custom html/css
native support for image
native support for draw