Direction from the current glyph to the next one on the baseline, which can be horizontal or vertical, in the natural script of the language.
Note this has nothing to do with where on the page the writing starts for multiple words on the page (sentences). This is the direction to the next glyph in a word along the baseline of the font.
The next character is below, as in Mongolian and Japanese.
The next character is left, as in Hebrew and Arabic.
The next character is right, as in English and Greek.
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