<html>
    <head>
        <title>Teste</title>
        <meta charset="UTF-8">
    </head>
    <body>
        <div id="content">
            <h1 id="content"><span id="content">não </span>funcionou</h1>
        </div>
    <!-- <script> -->
    <!--     // não funciona -->
    <!--     document -->
    <!-- .getElementById("content") -->
    <!-- .getElementById("content") -->
    <!-- .getElementById("content").innerText = "" -->
    <!-- </script> -->
    <script>
        //document.querySelector("#conten