CSS 类型选择器
英文：type selector 或 element selector.
CSS 类型选择器通过节点名称匹配元素。换句话说，它选择一个文件中所有给定类型的元素。
例子
html {color: black;}h1 {color: gray;}h2 {color: silver;}
完整示例
<!DOCTYPE html><html><head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>Simple styling of a simple document</title> <style type="text/css"> html {color: black; background-color: white; } h1 {color: gray;} h2 {color: silver;} </style></head><body><h1>Plutonium</h1><p>Useful for many applications, plutonium can also be dangerous if improperly handled.</p><h2>Safety Information</h2><p class="warning">When handling plutonium, care must be taken to avoid the formation of a critical mass.</p><p>With plutonium, <span class="warning">the possibility of implosion isvery real, and must be avoided at all costs</span>. This can be accomplished by keeping the various masses separate.</p><h3>Comments</h3><p>It’s best to avoid using plutonium <b>at all</b> if it can be avoided.</p></body></html>