If the element has a type attribute, use its value to figure out how the number of each list item should be formatted (Roman numerals, Arabic numerals, or alphabetic characters).
如果元素有type属性,则用这个值来决定应该如何格式化每个列表项的数字(罗马数字、阿拉伯数字或按字母次序的字符)。
Attribute names can include the same characters as element names, with similar rules for omitting Spaces and starting names with alphabetic characters.
属性名可以包含在元素名中使用的字符,规则也是类似的,即字符之间不能带有空格,名称只能以字母开始。
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