Ok, as it stands: You can not define anything within <li>list item.</li> blocks. But at least I’ve figured it out now. 😉 lol
Showing you here, how to use it on WordPress, as well as on Tumblr. 😉

Code blocks can use three or more back ticks (```), as well as tildes (~~~).
Syntax highlighting can be added to code blocks by specifying the code language in the first line of back ticks:


```css
 .ninja {
   visibility: hidden;
 }
```

WordPress
A semantic personal publishing platform
Markdown
Text-to-HTML conversion tool

Markdown converts text to HTML, for use on for example: WordPress.



<!--  As you can see by looking at the source, it ain't perfect. ;-)-->
Code blocks can use three or more back ticks `(```)`, as well as tildes `(~~~)`.
Syntax highlighting can be added to code blocks by specifying the code language in the first line of back ticks:

<pre class="prettyprint">
<code>
```css
 .ninja {
   visibility: hidden;
 }
```
</code>
</pre>

WordPress
:  A semantic personal publishing platform 

Markdown
:  Text-to-HTML conversion tool

Markdown converts text to HTML, for use on for example: WordPress.

*[HTML]: HyperText Markup Language

*[WordPress]: A semantic personal publishing platform.

*[Tumblr]: Tumblr, stylized in its logo as tumblr., is a microblogging platform and social networking website founded by David Karp and owned by Yahoo! Inc.