In the Vinony graph
Vinony files it under Chart formatting templates and Genealogy formatting templates.
Its subject is documented across 53 Wikipedia language editions.
~2 min read
Encyclopedic overview
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This was created to allow for the width of ancestry boxes to adapt if there is a tall thumbnail to the right. Put it and {{Chart bottom}} on separate lines from the Chart template they wrap around.
Excerpted from Wikipedia’s “Template:Chart top” article, available under the CC BY-SA 4.0 licence.