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[danimesq]

Isn't a good practice open external links in the same tab.
Nofish said:

Actually this is because technical limitation. ZeroNet running sites sandboxed iframe where the links with target="_blank" does not work properly in every browser.
Probably related to https://www.jitbit.com/alexblog/256-targetblank---the-most-underestimated-vulnerability-ever/

iframes can communicate with the main frame with JavaScript. ZeroNet can create a API for it.
When user clicks a link (that is modified for the code work), then the main receives this message with the link metadata, and then does the work.
Suggested to ZeroNet in HelloZeroNet/ZeroNet#897.