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<!DOCTYPE html>
<html>
<head>
<style>
.container {
  display: table;
  width: 90%;
  background-color: #2196F3;
  padding: 10px;
}
​
@supports (display: grid) {
  .container {
    display: grid;
    grid: auto;
    grid-gap: 10px;
    background-color: #2196F3;
    padding: 10px;
  }
}
​
.container > div {
  background-color: rgba(255, 255, 255, 0.8);
  text-align: center;
  padding: 20px 0;
  font-size: 30px;
}
</style>
</head>
<body>
​
<h1>The @supports Rule</h1>
​
<p>If the browser supports display: grid, the CSS inside the @supports rule will be applied. If not, the .container class outside the @supports rule will be applied:</p>
​
<div class="container">
  <div class="item1">1</div>
  <div class="item2">2</div>
  <div class="item3">3</div>  
  <div class="item4">4</div>
  <div class="item5">5</div>
  <div class="item6">6</div>
</div>
​
</body>