The requirement is to open Experience Editor in the Preview mode in a new tab.
1 Answer
Please use sc_mode=preview URL parameter:
If you need to open a link in the tab then you need to use target="_blank":
<a href="www.mysite.com?sc_mode=preview" target="_blank">my site in preview mode</a>
Or you can use Sitecore options if you're using link fields or RTE fields.