When you select an HTML element, Expression Web also shows a small bubble with additional information, such as size, distance from the left, and distance from the top.
Media theories of distance education: element, assistance or focus?
远程教育媒体理论：要素，辅助，还是中心。
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Having analyzed many factors, such as distance, Angle, element size, the number of gauss integral, etc., which have great effect on the gauss integral precision.