doc-scripts-debugger.html

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 <!-- This Source Code Form is subject to the terms of the Mozilla Public

    - License, v. 2.0. If a copy of the MPL was not distributed with this

    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->

<!DOCTYPE html>

<html>

  <head>

    <meta charset="utf-8"/>

    <title>Debugger test page</title>

  </head>

  <body>

    <script>

      debugger;

      // This inline script allows this HTML page to show up as a

      // source. It also needs to introduce a new global variable so

      // it's not immediately garbage collected.

      inline_script = function () { var x = 5; };

    </script>

  </body>

</html>