> Probably because English is written left to right and doesn't work so well top to bottom. My browser tabs are on the left side of the screen and they are all

> Probably because English is written left to right and doesn't work so well top to bottom. My browser tabs are on the left side of the screen and they are all written left to right. There is ample space on the sides of websites to fit this and show the entire tab title. Meanwhile, other people have tabs along the top of the screen that all show one or two letters followed by “...”. My taskbar is on the right and consists entirely of icons. The only text on it is the date/time and that is also written normally and not rotated. This is the setup that I was saying I don't understand the resistance against — not 90° rotated text. When people say “vertical tabs”, they are not talking about rotating the text.