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								---
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								id: bad87dee1348bd9aede07836
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											2020-12-16 00:37:30 -07:00
										 
									 
								 
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								title: 使用 id 属性来设定元素的样式
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								challengeType: 0
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											2019-12-13 13:47:57 +08:00
										 
									 
								 
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								videoUrl: 'https://scrimba.com/c/cakyZfL'
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								forumTopicId: 18339
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											2021-01-13 03:31:00 +01:00
										 
									 
								 
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								dashedName: use-an-id-attribute-to-style-an-element
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								---
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								# --description--
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											2021-02-06 04:42:36 +00:00
										 
									 
								 
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								通过 `id` 属性,你可以做一些很酷的事情。就像 class 一样,你可以使用 CSS 来设置他们的样式。
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								不过,`id` 不可以重复,它只能作用于一个元素上。 如果一个元素同时应用了 class 和 `id`,且两者设置的样式有冲突,会优先应用 `id` 中所设置的样式。
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								选择 `id` 为 `cat-photo-element` 的元素,并设置它的背景颜色为绿色。 可以在 `style` 标签里这样写:
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								```css
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								#cat-photo-element {
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								  background-color: green;
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								}
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								```
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								注意在 `style` 标签里,声明 class 的时候必须在名字前插入 `.` 符号。 同样,在声明 id 的时候,也必须在名字前插入 `#` 符号。
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								# --instructions--
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								请将 `id` 为 `cat-photo-form` 的表单的背景颜色设置为绿色。
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								# --hints--
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								`form` 元素的 id 应为 `cat-photo-form`。
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								```js
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								assert($('form').attr('id') === 'cat-photo-form');
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								```
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								`form` 元素应含有 `background-color` 属性,颜色为绿色。
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								```js
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								assert($('#cat-photo-form').css('background-color') === 'rgb(0, 128, 0)');
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								```
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								确保 `form` 元素的 `id` 设置正确。
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								```js
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								assert(
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								  code.match(/<form.*cat-photo-form.*>/gi) &&
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								    code.match(/<form.*cat-photo-form.*>/gi).length > 0
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								);
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								```
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								不要在 `form` 元素上添加其他 `class` 属性或者 `style` 行内样式。
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								```js
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								assert(!code.match(/<form.*style.*>/gi) && !code.match(/<form.*class.*>/gi));
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								```
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								# --seed--
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								## --seed-contents--
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								```html
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								<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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								<style>
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								  .red-text {
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								    color: red;
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								  }
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								  h2 {
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								    font-family: Lobster, monospace;
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								  }
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								  p {
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								    font-size: 16px;
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								    font-family: monospace;
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								  }
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								  .thick-green-border {
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								    border-color: green;
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								    border-width: 10px;
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								    border-style: solid;
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								    border-radius: 50%;
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								  }
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								  .smaller-image {
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								    width: 100px;
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								  }
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								  .silver-background {
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								    background-color: silver;
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								  }
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								</style>
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								<h2 class="red-text">CatPhotoApp</h2>
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								<main>
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								  <p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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								  <a href="#"><img class="smaller-image thick-green-border" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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								  <div class="silver-background">
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								    <p>Things cats love:</p>
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								    <ul>
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								      <li>cat nip</li>
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								      <li>laser pointers</li>
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								      <li>lasagna</li>
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								    </ul>
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								    <p>Top 3 things cats hate:</p>
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								    <ol>
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								      <li>flea treatment</li>
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								      <li>thunder</li>
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								      <li>other cats</li>
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								    </ol>
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								  </div>
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								  <form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
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								    <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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								    <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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								    <label><input type="checkbox" name="personality" checked> Loving</label>
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								    <label><input type="checkbox" name="personality"> Lazy</label>
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								    <label><input type="checkbox" name="personality"> Energetic</label><br>
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								    <input type="text" placeholder="cat photo URL" required>
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								    <button type="submit">Submit</button>
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								  </form>
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								</main>
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								```
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								# --solutions--
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								```html
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								<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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								<style>
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								  .red-text {
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								    color: red;
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								  }
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								  h2 {
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								    font-family: Lobster, monospace;
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								  }
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								  p {
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								    font-size: 16px;
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								    font-family: monospace;
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								  }
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								  .thick-green-border {
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								    border-color: green;
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								    border-width: 10px;
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								    border-style: solid;
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								    border-radius: 50%;
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								  }
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								  .smaller-image {
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								    width: 100px;
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								  }
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								  .silver-background {
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								    background-color: silver;
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								  }
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								  #cat-photo-form {
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								    background-color: green;
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								  }
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								</style>
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								<h2 class="red-text">CatPhotoApp</h2>
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								<main>
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								  <p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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											2021-02-06 04:42:36 +00:00
										 
									 
								 
							 | 
							
								
									
										
									
								
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											2021-01-13 03:31:00 +01:00
										 
									 
								 
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								  <a href="#"><img class="smaller-image thick-green-border" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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											2021-02-06 04:42:36 +00:00
										 
									 
								 
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											2021-01-13 03:31:00 +01:00
										 
									 
								 
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								  <div class="silver-background">
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								    <p>Things cats love:</p>
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								    <ul>
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								      <li>cat nip</li>
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								      <li>laser pointers</li>
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								      <li>lasagna</li>
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								    </ul>
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								    <p>Top 3 things cats hate:</p>
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								    <ol>
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								      <li>flea treatment</li>
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								      <li>thunder</li>
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								      <li>other cats</li>
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								    </ol>
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								  </div>
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											2021-02-06 04:42:36 +00:00
										 
									 
								 
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											2021-01-13 03:31:00 +01:00
										 
									 
								 
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							 | 
							
								
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								  <form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
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							 | 
							
							
								    <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
							 | 
						
					
						
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							 | 
							
							
								    <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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							 | 
							
							
								    <label><input type="checkbox" name="personality" checked> Loving</label>
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								    <label><input type="checkbox" name="personality"> Lazy</label>
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								    <label><input type="checkbox" name="personality"> Energetic</label><br>
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								    <input type="text" placeholder="cat photo URL" required>
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								    <button type="submit">Submit</button>
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								  </form>
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								</main>
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								```
							 |