一个样式可以有任意个属性：背景颜色、边框颜色、边框宽度、边框样式、字体颜色、字体集和字体大小。

A style can have any number of attributes: background color, border color, border width, border style, font color, font family, and font size.

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指定了插字符的宽度(逻辑单位)。如果这个参数为0，则宽度被设为系统定义的窗口边框宽度。

Specifies the width of the caret (in logical units). If this parameter is 0, the width is set to the system-defined window-border width.

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如果你在屏幕上向别人展示一个带有边框的元素，问他们这个元素的宽度是多少，他们会很自然的从边框的外边缘算起(即把边框宽度也计算在内)。

If you showed people an element with a border on the screen and asked them the width of that element, they would naturally measure from the outside edges of the border.

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