This property controls the intrinsic writing direction rendering for a block of content. The default is left-to-right, top-to-bottom common in western languages, but the alternate rendering mode is top-to-bottom, right-to-left which is a common rendering mode used in Asian writing systems. The half-width character rotation effect is not cumulative - it is always rotated with respect to the canvas.
Content rendered vertically
Character glyphs flow one after another from the source content from left to right, starting from the top of the element's rendering box. When a new line is started, it starts below the previous line at the left-hand side of the element's rendering box.
Character glyphs flow one after another from the source content from top to bottom, starting from the right side of the element's rendering box. When a new line is started, it starts to the left of the previous line at the top side of the element's rendering box. Full-width characters are rendered with their top on the same side as top of the rendering box, and half-width characters (select kana glyphs and western characters) are rendered rotated 90 degrees clockwise to the original rendering box's orientation.