CSS Conditional Rules @supports Example - HTML Real Time Editor Do It Yourself

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta content="IE=edge" http-equiv="X-UA-Compatible"/>
<meta content="width=device-width, initial-scale=1.0" name="viewport"/>
<title>CSS conditional rules, content negotiation, @supports example.</title>
</head>
<style>
    .topic {
      font-family: Arial, Helvetica, sans-serif;
      font-size: 32px;
      width: 200px;
      border: dashed 3px #000;
      border-radius: 10px;
      background-color: hotpink;
      color: #000;
      overflow: hidden;
    }
    .topic::before {
      display: inline-block;
      color: green;
      font-size: 16px;
    }
    @supports (-webkit-line-clamp: 3) and (display: -webkit-box) and
      (-webkit-box-orient: vertical) {
      .topic {
        -webkit-line-clamp: 3;
        display: -webkit-box;
        -webkit-box-orient: vertical;
      }
     
    }
    @supports not (-webkit-line-clamp: 3) or not (display: -webkit-box) or not
      (-webkit-box-orient: vertical) {
      @supports (text-overflow: ellipsis) {
        .topic {
          text-overflow: ellipsis;
          white-space: nowrap;
        }

.topic::before {
          content: "Your browser does not supports webkit-line-clamp: 3 but support text-overflow: ellipsis.";
        }
      }

@supports not (text-overflow: ellipsis) {
        .topic {
          display: block;
          height: 100px;
        }
        .topic::before {
          content: "Your browser does not supports webkit-line-clamp: 3 and text-overflow: ellipsis.";
        }
      }
    }
  </style>
<body>
<h2 class="topic">
      Testing out the CSS conditional rules with the @supports features.
    </h2>
</body>
</html>