You cannot optimize pictures that have a drawing type of format vectorgraphicsvectorgraphics: The representation of graphic objects such as lines, arcs, and squares by using geometrical formulas.
不能优化具有绘图类型格式矢量图形向量图形:使用几何公式的图形对象的表示形式,如线条、弧形和正方形。
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It also improves support for the XML-based vectorgraphics standard SVG.