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感觉老师讲的有问题，
3:38第6行[title~=hello]把小写的h改为大写的H试试，提交看看字的颜色会不会变红？
数据分析师2017-10-01 00:48:32
Understanding attributes and spaces - PHP Chinese website Q&A - Attributes understanding spaces - PHP Chinese website Q&A
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