81 lines
2.9 KiB
Markdown
81 lines
2.9 KiB
Markdown
---
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id: 587d778e367417b2b2512aab
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title: 使用高对比度文本提高可读性
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cKb3nCq'
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forumTopicId: 301017
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dashedName: improve-readability-with-high-contrast-text
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---
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# --description--
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低对比度的前景色与背景色会使文本难以阅读。 足够的对比度可以提高内容的可读性，但是怎样的对比度才算是“足够”的？
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Web 内容无障碍指南（WCAG）建议正常文本的对比度至少为 4.5 : 1。 对比度是通过比较两种颜色的相对亮度值来计算的。 对比度的范围是从相同颜色的 1:1（无对比度）到白色与黑色的最高对比度 21:1。 在线可用的对比检查工具很多，可以计算这个比率。
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# --instructions--
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Camper Cat 为他的博客选择了白色背景和浅灰色文字，对比度为 1.5:1，这使博客文章难以阅读。 请将文字的 `color` 从当前的浅灰色（`#D3D3D3`）修改为深灰色（`#636363`），以使对比度提升到 6:1。
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# --hints--
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应该将 `body` 的 `color` 修改为深灰色。
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```js
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assert($('body').css('color') == 'rgb(99, 99, 99)');
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```
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不应修改 `body` 的 `background-color`。
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```js
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assert($('body').css('background-color') == 'rgb(255, 255, 255)');
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```
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# --seed--
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## --seed-contents--
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```html
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<head>
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<style>
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body {
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color: #D3D3D3;
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background-color: #FFF;
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}
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</style>
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</head>
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<body>
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<header>
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<h1>Deep Thoughts with Master Camper Cat</h1>
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</header>
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<article>
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<h2>A Word on the Recent Catnip Doping Scandal</h2>
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<p>The influence that catnip has on feline behavior is well-documented, and its use as an herbal supplement in competitive ninja circles remains controversial. Once again, the debate to ban the substance is brought to the public's attention after the high-profile win of Kittytron, a long-time proponent and user of the green stuff, at the Claw of Fury tournament.</p>
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<p>As I've stated in the past, I firmly believe a true ninja's skills must come from within, with no external influences. My own catnip use shall continue as purely recreational.</p>
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</article>
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</body>
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```
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# --solutions--
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```html
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<head>
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<style>
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body {
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color: #636363;
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background-color: #FFF;
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}
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</style>
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</head>
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<body>
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<header>
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<h1>Deep Thoughts with Master Camper Cat</h1>
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</header>
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<article>
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<h2>A Word on the Recent Catnip Doping Scandal</h2>
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<p>The influence that catnip has on feline behavior is well-documented, and its use as an herbal supplement in competitive ninja circles remains controversial. Once again, the debate to ban the substance is brought to the public's attention after the high-profile win of Kittytron, a long-time proponent and user of the green stuff, at the Claw of Fury tournament.</p>
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<p>As I've stated in the past, I firmly believe a true ninja's skills must come from within, with no external influences. My own catnip use shall continue as purely recreational.</p>
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</article>
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</body>
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```
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