上面的 CSS 划定规矩：

strong {
     color: red;
     }

h2 {
     color: red;
     }

h2 strong {
     color: blue;
     }

下面是它施加影响的 HTML：

<p>The strongly emphasized word in this paragraph is<strong>red</strong>.</p>
<h2>This subhead is also red.</h2>
<h2>The strongly emphasized word in this subhead is<strong>blue</strong>.</h2>

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