markdown - Kramdown doesn't seem to render checkboxes like in GitHub -

it seems kramdown can recognise github flavoured markdown in jekyll. seems checkboxes available in github isn't getting rendered using kramdown, ideas why?

what trying do:

- [ ] unchecked - [x] checked 

this show disabled checkboxes in github not in jekyll.

this instructions on official website say. try it, maybe works than.

in addition defaults mentioned above, can turn on recognition of github flavored markdown passing input option value of “gfm”.

for example, in _config.yml:

kramdown:   input: gfm 

source: http://jekyllrb.com/docs/configuration/#kramdown