This Google Chrome extension is based on the need to be able to have vertical text orientation in Excel online. See https://excel.uservoice.com/forums/274580-excel-online/suggestions/12431940-there-is-no-text-orientation-option-in-excel-onlin
Install the Google Chrome extension at https://chrome.google.com/webstore/detail/ex-cell/mkboeldhilcedpoblpadgaknedmooafp
Click on the extension icon and click on "Start vertical mode". Then click on the cell you want to be vertically aligned. Then click the extension icon again and stop the mode.
See the mini screencast at https://youtu.be/tKCtGJW1-EY
- It is not yet possible to specify more orientation options
- Verticalization will vanish on page reload or after leaving the document
- Verticalization on a cell will vanish when the cell is edited
- It is not yet possible to first select a cell or region of cells and then apply the vertical style