[Enhancement] Small JS snippet to easily spot dead links

[xplshn]

Could we add this snippet to easily spot dead links? It will send a HEAD to every link in the page and if it is not 200, 403, 405, it will append this to the link: "[status: statusCode]", it is all client side and isn't noticeable, not even in web pages with lots of links, its what I have on my website too. :)

        // Function to check the status of a URL
        function checkLinkStatus(link, callback) {
            var proxyUrl = 'https://corsproxy.org/?';
            var targetUrl = encodeURIComponent(link.href);
            var xhr = new XMLHttpRequest();
            xhr.open('HEAD', proxyUrl + targetUrl, true);
            xhr.onreadystatechange = function() {
                if (xhr.readyState ===  4) {
                    callback(xhr.status);
                }
            };
            xhr.send();
        }

        // Function to update link text with status code
        function updateLinkText(link, statusCode) {
            // Check if a status span already exists for this link
            var existingStatusSpan = link.nextElementSibling;
            if (existingStatusSpan && existingStatusSpan.classList.contains('status_code')) {
                // Update the existing status span
                existingStatusSpan.textContent = ' [status: ' + statusCode + ']';
            } else {
                // Create a new span element with the class 'status_code'
                var statusSpan = document.createElement('span');
                statusSpan.className = 'status_code';

                // Check the status code and set the text content of the span
                if (statusCode !==  200) {
                    if (statusCode !==  0) {
                        if (statusCode !==  403) {
                            if (statusCode !==  405) {
                                statusSpan.textContent = ' [status: ' + statusCode + ']';
                            }
                        }
                    }
                }

                // Insert the status span after the link
                link.parentNode.insertBefore(statusSpan, link.nextSibling);
            }
        }

        // Function to check all links on page load
        function checkAllLinksOnPageLoad() {
            var links = document.querySelectorAll('a');
            links.forEach(function(link) {
                checkLinkStatus(link, function(statusCode) {
                    updateLinkText(link, statusCode);
                });
            });
        }

        // Run the function when the page loads
        window.onload = checkAllLinksOnPageLoad;

[github-actions]

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[xplshn]

:(