What is vertical tab?
In a browser that has the feature — like Microsoft Edge — vertical tabs flow better with the way you're already working or learning on the web. When activated, vertical tabs move your list of tabs out from the top bar of your browser and into a neat, organized column on the left sidebar.
What is horizontal tab and vertical tab?
The horizontal tab is usually inserted when the Tab key on a standard keyboard is pressed. A vertical tabulation (VT) also exists and has ASCII decimal character code 11 ( Ctrl + K or ^K), escape character \v . In EBCDIC the code for HT is 5. VT is 11 (coincidentally the same as in ASCII).