blender-manual/manual/modeling/geometry_nodes/utilities/color/mix_rgb.rst

Sphinx Warnings

4: ERROR: Error in "warning" directive:
unknown option: "start-after".

.. warning:: include not available in preview:  /compositing/types/color/mix/mix_color.rst
   :start-after: .. --- copy below this line ---

Note the preview is not accurate and warnings may not indicate real issues.