Shape of connections between borders
-ah-border-connection-form: specifies the shape of connections between borders. It is available in AH Formatter V6.6.

-ah-border-connection-form: mixed;

When -ah-border-connection-form is mixed, T-intersections of borders with the same thickness connect with squared off ends. Other connections are wedge-shaped.
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-ah-border-connection-form: wedge;

When -ah-border-connection-form is wedge, all borders connect with a wedge shape. Connections form an X shape at cross-shaped intersections, and form a Y shape at T-intersections.
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-ah-border-connection-form: precedence;

When -ah-border-connection-form is precedence, the thicker border is drawn to the edge. When intersecting borders have the same thickness, the border with the higher border priorityRefer to 17.6.2.1 Border conflict resolution for details of border priority. is drawn to the edge.
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For <div>, when ‘mixed’ or ‘wedge’ is specified, all border intersections are wedge-shaped, but when ‘precedence’ is specified, the shape depends on the relative priority of the borders.
-ah-border-connection-form: mixed;
-ah-border-connection-form: wedge;
-ah-border-connection-form: precedence;
-ah-border-connection-form: precedence;