With the ImageMap tool, assigning identifiers to individual pixels in the image is as easy as specifying a rectangle in the appropriate area and entering a unique string in the input box that pops up.
使用ImageMap工具，将标识符分配给图像中的各个像素相当简单，只需在相应的区域中指定矩形并在弹出的输入框中输入一个惟一的字符串。
Note that you invalidate the display list in either case because you want Flex to render (or remove) the focus rectangle around the box.
注意，两种情况都会导致显示列表无效，因为您需要 Flex 呈现（或删除）方框周围的焦点矩形。
A line-box is an imaginary rectangle that contains all the inline boxes that make up a line in the containing block-level element.
line - box是一个假想的矩形框，包含在此块级包含元素内连成一线的所有inline box。
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