While browsing a question, I realized I wanted to keep it open in another page in Safari on my iPhone so I could access it later (I keep a number of pages open for future reference).
In order to do so, I held down on the title link, which then prompts me with a number of options (email, open in new page).
However, opening in a new page causes the current page to refresh in the same page, and no new page is opened.
Since the behavior in a desktop browser when middle-clicking/opening in a new tab/page is to honor that intent (opening in a new tab/page), I'd expect it to be honored on the iPhone/smartphone browsers as well.