直接上代码，具体原理自己搜索网上一大堆

  1. <!DOCTYPE html>
  2. <html>
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  4.     <meta name="viewport" content="initial-scale=1">
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  6.     <meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover">
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  10.         body {
  11.             margin: 0;
  12.             font-family: Helvetica;
  13.             font-size: 16pt;
  14.             -webkit-text-size-adjust: 100%;
  15.             background-color: #eef;
  16.  
  17.             padding-top: env(safe-area-inset-top);
  18.             padding-left: env(safe-area-inset-left);
  19.             padding-right: env(safe-area-inset-right);
  20.             padding-bottom: env(safe-area-inset-bottom);
  21.         }
  22.         * {
  23.             box-sizing: border-box;
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  25.         #topBar {
  26.             background-color: #729fcf;
  27.             padding: env(safe-area-inset-top) env(safe-area-inset-right) 0 env(safe-area-inset-left);
  28.         }
  29.         #topBar a {
  30.             display: inline-block;
  31.             height: 100%;
  32.             padding: 12px;
  33.             border-right: 3px solid rgba(255, 255, 255, 0.5);
  34.             color: white;
  35.             text-decoration: none;
  36.             font-weight: bold;
  37.             font-size: 18pt;
  38.         }
  39.         #topBar a:last-child {
  40.             border-right: none;
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  42.         #bottomBar {
  43.             position: fixed;
  44.             left: 0;
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  46.             bottom: 0;
  47.             background-color: #3465a4;
  48.             text-align: center;
  49.             padding: 8px;
  50.  
  51.             padding-left: env(safe-area-inset-left);
  52.             padding-right: env(safe-area-inset-right);
  53.             padding-bottom: env(safe-area-inset-bottom);
  54.         }
  55.         #bottomBar a {
  56.             padding: 0 24px;
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  61.         h1 {
  62.             margin: 12px 0 0 0;
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  64.         h2 {
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  66.             font-size: 12pt;
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  68.             margin: 0;
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  70.         .post {
  71.             width: 100%;
  72.             margin-bottom: 50px;
  73.             padding: 12px;
  74.             padding-left: env(safe-area-inset-left);
  75.             padding-right: env(safe-area-inset-right);
  76.         }
  77.         .post p:first-child {
  78.             margin: 0;
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  87. <div class="post">
  88.     <h1>Welcome</h1>
  89.     <h2>two hours ago</h2>
  90.     <p>Hi!</p>
  91.     <p>Welcome to my sample blog!</p>
  92.     <p>This post is here to help demonstrate how easy it is to take an existing site, along with full-width bars and fixed-position elements, and make it take full advantage of iPhone X's edge-to-edge display.</p>
  93.     <p>The actual post describing how to adopt the new API is over on the <a href="https://webkit.org/blog/7929/designing-websites-for-iphone-x/">WebKit blog</a>.</p>
  94.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  95.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  96.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  97.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  98.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  99.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  100.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  101.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  102.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  103.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  104.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  105.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  106.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  107.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  108.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  109.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  110.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  111.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  112.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  113.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  114.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  115.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  116.     <p>There, you will learn all about new WebKit features, including <code>viewport-fit</code>, <code>constant()</code>, safe area insets, and <code>min()</code> and <code>max()</code>.</p>
  117.     <p>I hope that it helps you adopt these new features in your websites.</p>
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