It is common for the glyphs in documents written in East Asian languages to be laid out on a page in a grid pattern. This approach is helped by that fact that ideographic, kana and hangul characters tend to be the same width.

CSS3 may specify a set of properties for applying grids and for managing non-full width characters inside the grid, such as Latin text, in various ways. Such properties would indicate whether the grid should apply to non-ideographic characters in the same way as to CJK characters

This slide shows some vertical Japanese text with no grid applied.