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How to import variable from another html file? (I use import/export, but error occurs)

Martinez

//test_1.html

<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="utf-8" />
    <title>DB Test</title>
</head>
<body>
    <script type="module">
        var num = 1;
        console.log(num)

        export {num}
    </script>
</body>
</html>

//test_2.html

<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="utf-8" />
    <title>DB Test</title>
</head>
<body>
    <script type="module">
        import {num} from './test_1.html'
        console.log(num)
    </script>
</body>
</html>

I want to use variable named num in test_1.html and test_2.html, but when I open test_2.html, error like 'test_1.html:1 Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec.' occurs and console.log(num) at test_2.html doesn't work properly. How can I import/export properly?