NotAWolframAlphaPro/index.html at master · Redict/NotAWolframAlphaPro · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script>
        const supportsES6 = function() {
            try {
                new Function("(a = 0) => a");
                return true;
            }
            catch (err) {
                return false;
            }
        }();

        addEventListener("load", function () {
            if (supportsES6 !== true) {
                document.body.innerHTML = '<h1> Your browser not support ES6, download <a href="https://www.google.com/chrome/">Chrome</a></h1>';
            }
        });
    </script>
</head>
<body>
<script type="module" src="app.js"></script>
</body>
</html>