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Markdown is a text-to-HTML conversion tool, created by John Gruber
A nice overview of the Markdown Syntax on markdownguide
Always look for something off the shelf
In stead of writing it yourself
![alt text](https://imgs.xkcd.com/comics/chess_notation.png "Title")
yields:
Markdown accepts HTML within the code. To add an iframe, one types:
<center>
<iframe width="560" height="315" src="https://www.youtube.com/embed/QesmynqAjzs" frameborder="0" allowfullscreen></iframe>
</center>
And one gets: