Get a canonical URL using JavaScript

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I'm building a website internally and the page has a canonical URL set in the <head> that specifies the page's URL externally.

Is there any way to use JavaScript to obtain the canonical URL?


Something like this?

<!DOCTYPE html>
<html>
    <head>
        <link href="http://www.example.com/" rel="canonical" />
        <title>Canonical</title>
        <script type="text/javascript">
            window.onload = function () {
                var canonical = "";
                var links = document.getElementsByTagName("link");
                for (var i = 0; i < links.length; i ++) {
                    if (links[i].getAttribute("rel") === "canonical") {
                        canonical = links[i].getAttribute("href")
                    }
                }
                alert(canonical);
            };
        </script>
    </head>
    <body>
        <h1>Canonical</h1>
    </body>
</html>