DividerRenderer

Divider -- a hairline separating content.

Material 3's two dividers are already what the guide describes: a 1dp line in the theme's outline-variant colour, the horizontal one spanning the width it is given and the vertical one the height. Both are leaves in the Leaf-Margin sense, so both take leafMargin -- a divider pressed against the text above it is exactly the accumulated-spacing problem §3 is about, seen from the other side.

axis is read as a string and anything but vertical draws horizontal, which is the catalog's default and the reading a malformed value degrades to.