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Another subtle feature is that zooming can also be done independently along horizontal and vertical axes. Therefore, the user can plot in the coordinate system most comfortable for the context. This reduces effort in planning out pixel real estate. In addition, text labels are also designed to resize themselves automatically based on the current view or even clip if the text is not sufficiently large.
summon.js is currently under frequent development. See more details on the github page. This library was inspired by the python module of the same name: SUMMON.