On my page http://verein-iks.eu/dev/ I have a Facebook button on the top-right. If I click the button, I get forwarded to a Facebook page. However, the link is opened in the same window. I want it to be opened in a new window/tab. Hence, I use
In the footer of your DOM, there is a
<script> that is removing the target attribute from all links...
The reason you see the attribute when viewing the source is due to the fact that the source is what was received from the server. Inspect Element is a live view of what happens with the DOM, so it renders the result of the executed JS.