title: CSS backdrop-filter blur effect misaligned in Chrome
body: <p>I have a parent div with a fixed height, as well as a child div that extends outside of the parent. Within Chrome 75, this results in the parent div's backdrop-filter effect being applied outside of the expected area. This does not happen with IOS/Safari.</p>
  
  <p>Try it: <a href="https://jsfiddle.net/7grL6t0n/" rel="nofollow noreferrer">https://jsfiddle.net/7grL6t0n/</a></p>
  
  <p>Firefox or Edge don't support backdrop filters at all. Not sure about other platforms/browsers.</p>
  
  <p>Please note: You need to have 'Experimental Web Platform features' activated in chrome://flags to see the blur effect.</p>
  
  <p>Is this a Chrome bug or am I doing something wrong. If it is a bug, is there perhaps some CSS workaround for this problem?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>body {
    background-image: url(https://upload.wikimedia.org/wikipedia/commons/thumb/f/fe/USAF-1951.svg/1024px-USAF-1951.svg.png);
  }
  
  .parent {
    background-color: rgba(255, 0, 0, 0.5);
    height: 100px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }
  
  .child {
    background-color: rgba(0, 255, 0, 0.5);
    width: 300px;
    height: 300px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;body&gt;
    &lt;div class="parent"&gt;
      Parent with fixed height, red background and "blur" backdrop filter, which should appear within the parent, but is moved down by the child.
      &lt;div class="child"&gt;
        Child with green background, extending outsite of parent.
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/body&gt;</code></pre>
  </div>
  </div>
  </p>