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<!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/lib/w3.css"> <body class="w3-container"> <br> <div class="w3-container w3-border-left"> <p>The w3-border-left class adds a left border to an element.</p> </div> </body> </html>