In order to insert blocks of Markdown in your document, click on Insert from the toolbar menu and then Markdown.

A new Markdown block in your document is created where the cursor is. It looks like this:

You can now type some Markdown syntax. Hovering with your mouse on Preview, you will preview the rendered markdown content. Clicking outside of the block, you will render the content (a markdown flag will be added next to the block for you).
What type of Markdown is supported?
Authorea supports Github's flavor of Markdown.
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