IOS update IPAD, open in background/new window

DA9
DA9 Posts: 11,250
Recently updated, before, to read a linked article etc used to open a tab in new window, since the update it’s now allowing me to open in background, but it appears to do exactly the same as open in new window,  can anyone explain what the difference actually is and why or if I should do one opposed to the other?
TIA 

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