Một cách truy cập phần tử bằng js thông qua id lạ :)))

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="language" content="vietnamese">
    <meta property="og:locale" content="vi_VN">
        <meta name="google-site-verification" content="PuA4RXn1IGZbiglCjRvzLUPAKPYw6amIu79SJHmavlQ">
    <meta name="theme-color" content="#13b5ea">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="language" content="vn">
    <meta name="keywords" content="học trực tuyến, học online">
    <title>Document</title>
    <script>
        function t(){
            test.innerHTML = "abc";
        }
        window.onload = t;
        window.onresize = t;
    </script>
</head>
<body>
    <pre id="test"></pre>
</body>
</html>
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