三个矩形设置为响应键盘上的数字键1、2和3。
The three rectangles are set to respond to number keys 1, 2, and 3 on your keyboard.
所有矩形都设置为响应onclick、onmouseover和onmouseout事件，它们为此调用的是同一个脚本函数。
All the rectangles are set to respond to onclick, onmouseover, and onmouseout events, and all call the same scripted functions to do this.
设置按钮的宽度只是稍微复杂一点：复制矩形的宽度并在元素中增加了一个单位，为矩形的边框留下位置。
Fixing the button's width is only slightly more complicated: the width is copied as is on the rectangle, but incremented by one unit on the element to leave room for the rectangle's stroke.
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