# Blank lines

Blank lines (opens new window) between block-level elements are ignored, except for the role they play in determining whether a list (opens new window) is tight (opens new window) or loose (opens new window).
Blank lines at the beginning and end of the document are also ignored.

Example 197

Markdown HTML Demo
  

aaa
  

# aaa

  

<p>aaa</p>
<h1>aaa</h1>