File: changing_color_navigate.html

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<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, height=device-height">
  <script>
    const colors = {
      red: '#FF0000',
      green: '#00FF00',
      blue: '#0000FF'
    }
    navigation.addEventListener("navigate", ev => {
      ev.intercept({
        handler: async () => {
          var url = new URL(ev.destination.url);
          var color = colors[url.hash.substring(1)];
          if (!color) {
            color = colors.red;
          }
          var style = `height: 100vh; background-color: ${color};`
          document.querySelector("#content").setAttribute("style", style);
        }
      });
    });
  </script>
</head>
<body style="border: 0; margin: 0; padding: 0; overflow:hidden;">
  <div id="content" style="height: 100vh; background-color:#FF0000;"></div>
</body>
</html>