bootstrap框架中<h1>~<h6>标签中使用<small>标签时，样式 h1 small与h1 .small什么区别呢？为什么有个点

Answer 1

第一个是选择small标签第二个是选择class=small的元素

Answer 2

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Answer 3

第一个的small不是样式的类，第二个是，第一个这么写的？不会是small标签吧