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如果可以写成<div></div><div></div>那么就不要写成<div><div></div></div>
比如<div><h2></h2></div>已经能满足要求,那么就不要再写成<div><div><h2></h2></div></div>
比如不要出现这种情况:<div class="class1 class2 class3 class4"></div>
比如在这样一个列表中,li标签中的itm应去除:<ul class="m-help"><li class="itm"></li><li class="itm"></li></ul>