This issue is applicable to Japanese, Chinese, Korean, and Mongolian.

If you place the writing-mode property with a value of vertical-rl/lr on an individual table cell in a table that overall has a horizontal direction, you would expect the text in that cell to be displayed vertically, but in some browsers it isn't, unless the height of the td element is specified.

For more details, see this GitHub issue, which is being used to track this gap. Please add any discussion there, and not to this issue.