Beispiel:CSS grundlagen attribut-selektor-caseinsensitiv.html

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<!DOCTYPE html>
<html lang="de">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" media="screen" href="./Beispiel:SELFHTML-Beispiel-Grundlayout.css">
  <title>caseinsitive Attributselektoren</title>
  <style>
    [class="warning"] {color: red;}
    [class="warning" i] {background-color: lightgray;}
    div {
      font-family: sans-serif;
      font-weight: bold;
      width: 10em;
      margin: .5em;
      padding: .5em;
      text-align: center;
    }
  </style>
</head> 

<body>
  <h1>Case-insensitive Attributselektoren</h1>
  <main>
    <div class="warning">warning</div>
    <div class="Warning">Warning</div>
    <div class="WARNING">WARNING</div>
  </main>
</body>
</html>