This has been a mystery to me for a while, and for some reason Google didn't help me, so let me ask.

EDIT: ok, I understand the GFM is everywhere in GitHub, and why GFM style line break edit is not available?? Is it turned off? and I know the original MD rule. What I'd like to confirm here is GFM line break rule. Thank you.

I like GFM very much especially for the straightfoward line break manner. https://help.github.com/articles/github-flavored-markdown However, I have been never able to post my own Markdown with this line beak mode.

For instance, I copied some syntax list MD to a new page of one of my wiki on GitHub.

https://github.com/kenokabe/kenokabe.github.io/wiki/MarkDownGFM

As you can confirm the MD source.

This is intended as a quick reference and showcase. 
For more complete info, see [John Gruber's original spec]

a single new line is applied; however, the result shown with no new line.

What do I miss? Where is GitHub Flavored Markdown (GFM) is actually used in GitHub?

(Technical note: Markdown Here uses GFM line breaks, so there's no need to use MD's two-space line breaks.)

It certainly says so, but I found this md uses 2 spaces br manner.

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