In this case. It is wrong to just test 2 tab, you need two at its 'narrowest' size. You will find nothing is even differentiable in this situation. The icon is

In this case. It is wrong to just test 2 tab, you need two at its 'narrowest' size. You will find nothing is even differentiable in this situation. The icon is now at middle of two title. And even worse, the gap is so big so you won't have confidence which tab will you hit unless you hit exactly on text or icon (at the cost of hit area reduced to 2/3 of original tab) or hover to see which tab lit(at the cost of delay due to visual check). As someone who likes to open many tabs, the experience sucks.