標籤：ack test bsp his select class pre meta 針對
http://www.w3school.com.cn/css/css_selector_type.asp
最常見的 CSS 選取器是元素選取器。換句話說，文檔的元素就是最基本的選取器。
如果設定 HTML 的樣式，選取器通常將是某個 HTML 元素，比如 p、h1、em、a，甚至可以是 html 本身：
html {color:black;}h1 {color:blue;}h2 {color:silver;}
<!DOCTYPE html><html><head> <meta charset="utf-8" /> <title>CSS Test Website</title> <style type="text/css"> html { color: black; } h1 { color: blue; } h2 { color: silver; } </style></head><body> <h1>This heading 1</h1> <h2>This heading 2</h2> <p>This is a normal paragraph.</p></body></html>
嘗試將html設定為red之後：html僅僅針對文本，無法對title起作用
CSS元素選取器
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