Open html file in a new tab instead of downloading it

Question

For my Trac plugin, I have made an export script which converts contents to a different format. The result is an HTML code.

When I click the link, some browsers open the HTML code in a new tab, while others offer to download it as a .print file, depending on their specific settings I think. Opening this .print file shows the same HTML page as opening it directly, but locally instead of from the server.

How can I force it to always open in a new tab?
I think it might be a mimetype issue. If it is, which mimetype can I use to tell the browser to open the HTML code directly? I am currently using text/html as mimetype.

EDIT: some more info
To give some more insight, adapting from a comment of mine below:
I do not create the link myself. The link is provided by Trac, the bug tracking software the plugin is for, and what I do is implement the method that creates the HTML code and let it return the HTML code along with the mimetype. Trac then returns the HTML code either as a file, or as a new tab, when clicking on that content conversion link. What I am searching for is a possibility to specify in the HTML code or mimetype that it gets opened in a new tab directly.

1. Maybe there is some kind of mimetype specifying the (HTML) text as an HTML web document instead of HTML file (if that distinction even exists).
2. Or an HTML/XML header or doctype specifying whether it gets downloaded or opened by a browser. I think the browser need to get that information from somewhere.
3. Or maybe there is an option to set in Trac.

I hope these ideas of mine about what could exist can help those of you who are versed with either or some of these to find a solution. I could not find a solution through my research yet.

Answer 1

If you have a link that "directly" opens (not in a new tab) and you want it to open a new tab, one way of doing it is

<a href="url" target="_blank"> </a>

This will create a blank page, then paste the link there automagically and thus you will have a new tab with the desired page.