從 w3school copy過來的資料，翻譯註解一下：
http://www.w3schools.com/cssref/css_selectors.asp
| Selector | Example | Example description | CSS |
|---|---|---|---|
| .class | .intro | 選擇所有帶有 class="intro" 的元素 (可以多個) | 1 |
| #id | #firstname | 選擇特定 id="firstname" 的元素 (應該只有特定的一個) | 1 |
| * | * | 選擇所有的元素 | 2 |
| element | p | 選擇所有 <p> 元素 | 1 |
| element,element | div, p | 選擇所有 <div> 和所有 <p> 元素 | 1 |
| element element | div p | 選擇所有存在 <div> 元素裡面的 <p> 元素 | 1 |
| element>element | div > p | 選擇所有父親是 <div> 元素的 <p> 元素 這跟上一個有何不同？ div p 是所有 div裡面的 p，不管多少層以下； div > p 則是div的底下一層。<!DOCTYPE html> <style> #ttt > p { background-color: yellow;} </style> <div id = ttt> <h2>My name is Donald</h2> <p>I live in Duckburg.這一段有選上</p> <div><p>這一段沒有被選上</p></div> </div> <p>My best friend is Mickey.這一段沒有選上</p> | 2 |
| element+element | div + p | Selects all <p> elements that are placed immediately after <div> elements 所有立即接在 <div> 後面的 <p>。 理論上應該只有一個會立即接在後面啊？！上面怎麼說 all 呢？ <style> div + p {background-color: yellow;} </style> <div> <h2>My name is Donald</h2> <p>I live in Duckburg.這沒有</p> </div> <p>My best friend is Mickey.這個有選上</p> <p>I will not be styled.這個沒有</p> | 2 |
| element1~element2 | p ~ ul | Selects every <ul> element that are preceded by a <p> element 選擇所有 <p>後面的每一個 <ul>， <html> <head> <style> p ~ ul { background: #ff0000; } </style> </head> <body> <div>A div element.</div> <ul> <li>Coffee這段沒有</li> <li>Tea</li> <li>Milk</li> </ul> <p>The first paragraph.</p> <ul> <li>Coffee這段以後都有</li> <li>Tea</li> <li>Milk</li> </ul> <h2>Another list</h2> <ul> <li>Coffee這有</li> <li>Tea</li> <li>Milk</li> </ul> </body> </html> | 3 |
| [attribute] | [target] | Selects all elements with a target attribute | 2 |
| [attribute=value] | [target=_blank] | Selects all elements with target="_blank" | 2 |
| [attribute~=value] | [title~=flower] | Selects all elements with a title attribute containing the word "flower" | 2 |
| [attribute|=value] | [lang|=en] | Selects all elements with a lang attribute value starting with "en" | 2 |
| [attribute^=value] | a[href^="https"] | Selects every <a> element whose href attribute value begins with "https" | 3 |
| [attribute$=value] | a[href$=".pdf"] | Selects every <a> element whose href attribute value ends with ".pdf" | 3 |
| [attribute*=value] | a[href*="w3schools"] | Selects every <a> element whose href attribute value contains the substring "w3schools" | 3 |
| :active | a:active | Selects the active link | 1 |
| ::after | p::after | Insert content after every <p> element | 2 |
| ::before | p::before | Insert content before the content of every <p> element | 2 |
| :checked | input:checked | Selects every checked <input> element | 3 |
| :disabled | input:disabled | Selects every disabled <input> element | 3 |
| :empty | p:empty | Selects every <p> element that has no children (including text nodes) | 3 |
| :enabled | input:enabled | Selects every enabled <input> element | 3 |
| :first-child | p:first-child | Selects every <p> element that is the first child of its parent | 2 |
| ::first-letter | p::first-letter | Selects the first letter of every <p> element | 1 |
| ::first-line | p::first-line | Selects the first line of every <p> element | 1 |
| :first-of-type | p:first-of-type | Selects every <p> element that is the first <p> element of its parent | 3 |
| :focus | input:focus | Selects the input element which has focus | 2 |
| :hover | a:hover | Selects links on mouse over | 1 |
| :in-range | input:in-range | Selects input elements with a value within a specified range | 3 |
| :invalid | input:invalid | Selects all input elemets with an invalid value | 3 |
| :lang(language) | p:lang(it) | Selects every <p> element with a lang attribute equal to "it" (Italian) | 2 |
| :last-child | p:last-child | Selects every <p> element that is the last child of its parent | 3 |
| :last-of-type | p:last-of-type | Selects every <p> element that is the last <p> element of its parent | 3 |
| :link | a:link | Selects all unvisited links | 1 |
| :not(selector) | :not(p) | Selects every element that is not a <p> element | 3 |
| :nth-child(n) | p:nth-child(2) | Selects every <p> element that is the second child of its parent | 3 |
| :nth-last-child(n) | p:nth-last-child(2) | Selects every <p> element that is the second child of its parent, counting from the last child | 3 |
| :nth-last-of-type(n) | p:nth-last-of-type(2) | Selects every <p> element that is the second <p> element of its parent, counting from the last child | 3 |
| :nth-of-type(n) | p:nth-of-type(2) | Selects every <p> element that is the second <p> element of its parent | 3 |
| :only-of-type | p:only-of-type | Selects every <p> element that is the only <p> element of its parent | 3 |
| :only-child | p:only-child | Selects every <p> element that is the only child of its parent | 3 |
| :optional | input:optional | Selects input elements with no "required" attribute | 3 |
| :out-of-range | input:out-of-range | Selects input elements with a value outside a specified range | 3 |
| :read-only | input:read-only | Selects input elements with the "readonly" attribute specified | 3 |
| :read-write | input:read-write | Selects input elements with the "readonly" attribute NOT specified | 3 |
| :required | input:required | Selects input elements with the "required" attribute specified | 3 |
| :root | :root | Selects the document's root element | 3 |
| ::selection | ::selection | Selects the portion of an element that is selected by a user | |
| :target | #news:target | Selects the current active #news element (clicked on a URL containing that anchor name) | 3 |
| :valid | input:valid | Selects all input elements with a valid value | 3 |
| :visited | a:visited | Selects all visited links | 1 |
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