In Safari for iPad and Mac (but not iPhone), you can quickly open a link in a background tab by dragging it up to the tab bar. A green (+) button will appear—drop the link, and it will become a new tab.
In Safari for iPad and Mac (but not iPhone), you can quickly open a link in a background tab by dragging it up to the tab bar. A green (+) button will appear—drop the link, and it will become a new tab.