What causes the backdrop-filter: blur to malfunction when other elements are animated on the page?

I'm currently in the process of designing a website, and have implemented the backdrop-filter: blur(12px) CSS effect on my navbar. Unfortunately, I encountered an issue when trying to animate text elements using CSS animations, as the blur filter would disappear. This problem affected all elements on the page.

Here is a snippet showcasing the problem:

<head>
  <style>
    body {
      background-color: rgb(8, 8, 8);
      color: white;
    }
    
    .header {
      position: fixed;
      left: 0;
      right: 0;
    }
    
    .navbar {
      display: flex;
      flex-flow: column;
      margin: auto;
      border-radius: 16px;
      width: 40%;
      padding: 1rem;
      background: rgba(0, 0, 0, 0.2);
      min-height: 48;
      backdrop-filter: blur(12px);
      border: 1px solid hsla(0, 0%, 100%, 0.1);
    }
    
    .text {
      display: flex;
      margin: auto;
      padding: 0;
    }
    
    .fadeIn span {
      opacity: 0;
      filter: blur(12px);
      transform: translateX(-20px) translateY(30px);
      animation: fadeIn 1s ease-out forwards;
      display: inline-block;
    }
    
    .fadeIn span:nth-of-type(1) {
      animation-delay: 0.3s;
    }
    
    @keyframes fadeIn {
      to {
        filter: blur(0px);
        opacity: 1;
        transform: translateX(0) translateY(0);
      }
    }
  </style>

</head>

<body>
  <div style="display: flex; flex-direction: column">
    <div class="header">
      <div class="navbar">
        <a href="/">Home</a>
        <a href="/test">Test</a>
        <a href="/about">About</a>
      </div>
    </div>

    <div class="text fadeIn">
      <h1><span>Here is my content</span></h1>
    </div>
  </div>
</body>

If you remove the fadeIn class from the text, the issue disappears. My assumption is that this issue arises from the combination of filter and transform properties, but I wanted to verify if this is indeed the case. Upon researching, some sources suggest that there was a previous bug in Chrome causing such problems, which has reportedly been fixed.

I would greatly appreciate any solutions or insights into resolving this issue!

Answer №1

Consider adding z-index: 1 to the style for .header.

.header {
  position: fixed;
  left: 0;
  right: 0;
  /* added */
  z-index: 1;
}

It appears that applying an animation to .fadeIn can alter the stacking order. To address this, make sure to explicitly define the stacking order of the element using backdrop-filter with a higher z-index value. Otherwise, it may not impact the elements positioned above it.

<head>
  <style>
    body {
      background-color: rgb(8, 8, 8);
      color: white;
    }
    
    .header {
      position: fixed;
      left: 0;
      right: 0;
      /* added */
      z-index: 1;
    }
    
    .navbar {
      display: flex;
      flex-flow: column;
      margin: auto;
      border-radius: 16px;
      width: 40%;
      padding: 1rem;
      background: rgba(0, 0, 0, 0.2);
      min-height: 48;
      backdrop-filter: blur(12px);
      border: 1px solid hsla(0, 0%, 100%, 0.1);
    }
    
    .text {
      display: flex;
      margin: auto;
      padding: 0;
    }
    
    .fadeIn span {
      opacity: 0;
      filter: blur(12px);
      transform: translateX(-20px) translateY(30px);
      animation: fadeIn 1s ease-out forwards;
      display: inline-block;
    }
    
    .fadeIn span:nth-of-type(1) {
      animation-delay: 0.3s;
    }
    
    @keyframes fadeIn {
      to {
        filter: blur(0px);
        opacity: 1;
        transform: translateX(0) translateY(0);
      }
    }
  </style>

</head>

<body>
  <div style="display: flex; flex-direction: column">
    <div class="header">
      <div class="navbar">
        <a href="/">Home</a>
        <a href="/test">Test</a>
        <a href="/about">About</a>
      </div>
    </div>

    <div class="text fadeIn">
      <h1><span>Here is my content</span></h1>
    </div>
  </div>
</body>

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