title: Is there layout viewport in android chrome?
body: <p>in my <code>chrome 65.0.3325</code> on <code>android 8.10</code>, </p>
  
  <p>I set css on a element:</p>
  
  <pre><code>position: fixed;
  bottom: 0;
  </code></pre>
  
  <p>when I start input something in a <code>input</code> element, the keyboard popup, the element that positioned by fixed, will also "popup up", seem to position by visual viewport</p>
  
  <p>as I remembered, the <code>position:fixed</code>, will position the element by the layout viewport;</p>
  
  <p>why does it failure？</p>
  
  <p>I write a demo to describe the case:
  <a href="https://jsfiddle.net/9oms6grn/7/show" rel="nofollow noreferrer">A Demo on jsfiddle</a></p>
  
  <p>the screenshot when i run the demo on my phone:</p>
  
  <p><a href="https://i.stack.imgur.com/zURF1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zURF1.png" alt="enter image description here"></a></p>