Markdown fenced code blocks does not work

[DengMinghua]

I try to use fenced code blocks (should be a standard markdown syntax) in the editor like

    code
    blocks

but it does not work, which makes it hard to include example codes into the pages.
Is it caused by bugs or the syntax is just not supported yet?

Thanks!

[li116tao]

you must have typed the wrong sign, it is " ` " , not ' ' '