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How can I use internal link? For example I would like to have a link to 3rd tab in the content of 1st tab.

Please create the link as always but add #! before page name:

<a href='#!/resume'>Resume Tab</a>

Then you’ll need to add appropriate class named link :
<a class='link' href='#!/resume'>Resume Tab</a>
That’s all – now your link will open tab without page reload. You can of course use also full url with domain:
<a class='link' href='http://yourdomain.com/#!/resume'>Resume Tab</a>
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