The CSS2 Specification states that the element should have an explicit width using the "width" property or an implicit width computed from contained sub-elements, such as an image.
CSS2规范要求元素必须要么具有使用“宽度”属性指定的显式宽度，要么具有从所包含的子元素(比如图像)计算得出的隐式宽度。
Team pennant specification: in length 200 centimeters, in width 200 centimeters, color optional.
队旗规格：长200厘米以内，宽200厘米以内，颜色自选。
Before we do anything let me send you a "specification" that includes weight, width, core, roll length, etc.
在我们做任何事之前，让我们把规格，包含重量，宽幅，轴芯，卷长等定下来。
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