102 lines
3.9 KiB
Markdown
102 lines
3.9 KiB
Markdown
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---
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id: bad87fee1348bd9aedf08808
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title: Specify How Fonts Should Degrade
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challengeType: 0
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videoUrl: ''
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localeTitle: 指定字体应如何降级
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---
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## Description
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<section id="description">所有浏览器都有几种默认字体。这些通用字体系列包括<code>monospace</code> ， <code>serif</code>和<code>sans-serif</code>当一个字体不可用时，您可以告诉浏览器“降级”为另一种字体。例如，如果您希望元素使用<code>Helvetica</code>字体，但在<code>Helvetica</code>不可用时降级为<code>sans-serif</code>字体，则将按如下方式指定： <blockquote> p { <br> font-family：Helvetica，sans-serif; <br> } </blockquote>通用字体系列名称不区分大小写。此外，它们不需要引号，因为它们是CSS关键字。 </section>
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## Instructions
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<section id="instructions">首先，将<code>monospace</code>字体应用于<code>h2</code>元素，以便它现在有两种字体 - <code>Lobster</code>和<code>monospace</code>字体。在上一个挑战中，您使用<code>link</code>标记导入了<code>Lobster</code>字体。现在注释掉谷歌字体导入的<code>Lobster</code>字体（使用之前学过的HTML评论），以便它不再可用。注意你的<code>h2</code>元素如何降级为<code>monospace</code>字体。 <strong>注意</strong> <br>如果您的计算机上安装了Lobster字体，您将看不到降级，因为您的浏览器能够找到该字体。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 你的h2元素应该使用字体<code>Lobster</code> 。
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testString: 'assert($("h2").css("font-family").match(/^"?lobster/i), "Your h2 element should use the font <code>Lobster</code>.");'
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- text: 当<code>Lobster</code>不可用时，你的h2元素会降级为<code>monospace</code>字体。
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testString: 'assert(/\s*h2\s*\{\s*font-family\:\s*(\"|")?Lobster(\"|")?,\s*monospace\s*;\s*\}/gi.test(code), "Your h2 element should degrade to the font <code>monospace</code> when <code>Lobster</code> is not available.");'
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- text: 通过在其前面放置<code><!--</code>来注释您对Google的<code>Lobster</code>字体的调用。
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testString: 'assert(new RegExp("<!--[^fc]", "gi").test(code), "Comment out your call to Google for the <code>Lobster</code> font by putting <code><!--</code> in front of it.");'
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- text: 请务必通过添加<code>--></code>来关闭您的评论。
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testString: 'assert(new RegExp("[^fc]-->", "gi").test(code), "Be sure to close your comment by adding <code>--></code>.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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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;
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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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</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 src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div>
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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="/submit-cat-photo">
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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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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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