请保持代码的简洁性。尽量使用简写属性，当没有必要的时候应当避免使用多个属性。
Keep your code terse. Use shorthand properties and avoid using multiple properties when it's not needed.
对绝大多数的简写属性来说，并没有这样的歧义问题，因而简写属性的多个值往往可以随意排列。
For most shorthands, there is no such disambiguation issue and their values can be specified in any order.
语法简写(参见清单5)作为首选的方法被保留，可以在步骤元素上使用名称-值属性定义选项。
The syntactic shorthand (see Listing 5) was retained as the preferred method whereby options can be defined with name-value attributes on the step element itself.
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