Safari allows you to open links in a new tab on the iPhone or iPad, but immediately jump to this new tab. To open all the new tabs in the background instead:
For a long time, opening links in new tabs on an iPhone or iPad was a simple case when you touch and hold a link and then tap Open in New Tab. This works great if you do not want to lose your place on your current website. However, it can be uncomfortable if you just open a tab and want to come back to it later. For that you want to be able to open a new tab in the background.
Fortunately, in the heart of App Settings on the iPhone and iPad, you'll find a setting that does just that. If this option is enabled, all tabs open in the background, instead of stealing the focus, and that's pretty big.
To get started, open the Settings app and tap Safari.
Scroll down and tap "Open Links" to open the next screen.
The next screen displays the two options available to you. If you want to open new links in the background without stealing the focus, tap Background and exit the Settings app.
Now whenever you tap and hold A link in Safari displays a new option that opens "Open in Background". That's exactly what you do when you tap it.