该属性为可视化用户代理提供了格式化块的目标宽度信息。
This attribute provides a hint to visual user agents about the desired width of the formatted block.
图形部分显示每个状态下的目标数目，而每个状态条形图的宽度与处于该状态的目标数目成正比。
The graphic portion shows the number of targets in each state and the width of the bar for each state is proportional to the number of targets in that state.
如果目标在大小上增长，并超过了以上所显示的宽度，归咎于文本大小及字体的改变，图像会被拉开，产生不美观的间隙。
If the object grows any larger than the width shown above, due to differing text or type size changes, the images will get pulled apart, creating an ugly gap.
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