CSS Writing Modes is a CSS property that allows you to control the direction and orientation of text on a web page. It allows you to set the direction of text from left-to-right (ltr) or right-to-left (rtl). It also allows you to set
From Wikipedia
Many East Asian scripts can be written horizontally or vertically. Chinese characters, Korean hangul, and Japanese kana may be oriented along either axis, as they consist mainly of disconnected logographic or syllabic units, each occupying a square block of space, thus allowing for flexibility for which direction texts can be written, be it horizontally from left to right, horizontally from right to left, vertically from top to bottom, or even vertically from bottom to top.