The following two paragraphs both have a block quote after them, but the first has no blank line before the block quote. Neither Markdown.pl nor TextMate care but Sundown does not parse the first block quote as a block quote: it treats it as part of the paragraph.
Is there a reason that Sundown wants the blank line?
Input Text
A paragraph with a blockquote afterwards with no gap.
> Ohai I am a blockquote.
A paragraph with a blockquote afterwards with a one-line gap.
> Ohai I am another blockquote
Markdown.pl Output
<p>A paragraph with a blockquote afterwards with no gap.</p>
<blockquote>
<p>Ohai I am a blockquote.</p>
</blockquote>
<p>A paragraph with a blockquote afterwards with a one-line gap.</p>
<blockquote>
<p>Ohai I am another blockquote</p>
</blockquote>
Sundown Output
<p>A paragraph with a blockquote afterwards with no gap.
> Ohai I am a blockquote.</p>
<p>A paragraph with a blockquote afterwards with a one-line gap.</p>
<blockquote>
<p>Ohai I am another blockquote</p>
</blockquote>
Indeed, the same with "```" and other things. I noticed, that github used to have the same problem, but they fixed it somehow, but I can't see the fix in sundown.
The following two paragraphs both have a block quote after them, but the first has no blank line before the block quote. Neither Markdown.pl nor TextMate care but Sundown does not parse the first block quote as a block quote: it treats it as part of the paragraph.
Is there a reason that Sundown wants the blank line?
Input Text
Markdown.pl Output
Sundown Output