MAIDR JavaScript API
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    Variable TREE_PATH_SEPARATORConst

    TREE_PATH_SEPARATOR: "/" = '/'

    How Plot joins a tree node's ancestors in the <title> it draws.

    Not the caller's delimiter: measured on Plot.tree(…, {delimiter: '.'}), the titles still came back /-joined, because Plot normalises the path it parsed rather than echoing the spelling it was given.