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1·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)。