SSSVG: An Interactive SVG Reference
Briefly

viewBox
is an important attribute set on the <svg> element.It defines the coordinate system for the entire SVG.The value for viewBox is a set of 4 space-separated values: x-min, y-min, width and height.In the majority of the cases, x-min and y-min are both set to zero, meaning that the coordinate system starts at the top left corner of the SVG.
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