The markdown parser bundled within the plugin Markup Markdown is using the extended version of the markdown syntax called “Markdown Extra

How to open links in a new tab

Attributes with the relatives values are used within brackets.

[Markup Markdown Plugin](https://www.markup-markdown.com){target=blank rel=nofollow}

will be rendered as :

<a href="https://www.markup-markdown.com" target="blank" rel="nofollow">Markup Markdown Plugin</a>

The JavaScript editor on the edit screen does not support every feature of the advanced syntax so using the standard keyword _blank will trigger the italic rendering until the end of the line. A workaround is be to use your own frame name like blank or newtab for example:

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