PhiLho
The site even has an ambiguous example: three: 4 # oops Well, is that "4 # oops" or 4? I saw no rule about ending comments, and they say that three: 3 times is a string.
I have seen no formal specification of the grammar, so we already have lot of ambiguity. Good luck to implementers...
Seriously, removing the "no quotes needed" rule would improve greatly the format. If you want to include HTML with double quotes literally, just use the multiline string format and be done.
[2] http://lhorie.github.io/mithril/ (using its own virtual Dom); I think there are other implementations around, too.
[3] http://cycle.js.org/ (have a native driver)
FYI.
That's what Java IDEs do with static final variables.
You can make smart, high level languages like Haskel or Ceylon, but people will generally prefer dumb, easy to learn languages like Basic, PHP or JavaScript, despites their limitations.
Result: instead of making a nice car, well designed and looking good, they put big wheels and powerful engine on soap box cars! :-)