When you follow a link to a comment or answer you might end-up being confused if the answer or comment is removed.

This little userscript shows a warning on top of the page when the link you just used contains a fragment to an answer or comment that no longer exists on the page.

This is a repost of my original answer on Meta Stack Exchange


Here is an Animated GIF to show the script in action
GIF kindly provided by user 41686d6564

Download / Install:

You can find it ready to be consumed by TamperMonkey or GreaseMonkey on the Github repository. Here is the direct install aand here it the source.


The script will run on any browser that support userscripts with the general available userscript managers like Tampermonkey or GreaseMonkey.


If you find a bug or have a feature request either create an issue or leave a comment here.

Allow for 6 to 8 weeks before fixing.


The code is released under the MIT License


The code is written in JavaScript and has a dependency on the jQuery loaded on the page by Stack Exchange.

For interested parties here is the full code:

 // ==UserScript==
// @name         Check if comment and answer exist
// @namespace    http://meta.stackexchange.com/users/158100/rene
// @version      1.2
// @description  Show a message if the answer or comment in the hash of the url doesn't exist
// @author       rene
// @match        *://*.stackexchange.com/questions/*
// @match        *://stackoverflow.com/questions/*
// @match        *://serverfault.com/questions/*
// @match        *://askubuntu.com/questions/*
// @match        *://mathoverflow.net/questions/*
// @match        *://stackapps.com/questions/*
// @match        *://superuser.com/questions/*
// @grant        none
// ==/UserScript==

(function (document, window, StackExchange) {

    var hash = (window.location && window.location.hash)?window.location.hash:'';

    function showMessage(jqsel, text) {
        if (jqsel === null) {
            // wait for SE to be ready
            StackExchange.initialized.done(function() {
                var classid = 'missing-post-or-comment';
                // put a notify on top
                StackExchange.notify.show('The ' + text + ' is not found. It may have been deleted', classid);
                // remove it automagically after 5 seconds
                setTimeout(function () { StackExchange.notify.close(classid);}, 5000);

    StackExchange.ready( function() {
        if (hash.length > 0) {
            cleanHash = hash.substring(1);
            if (cleanHash.indexOf('comment') === 0) {
                ids = cleanHash.substring(7).split('_');
                var lnk = document.getElementById('comments-link-' + ids[1]);
                if (lnk !== null) {
                    StackExchange.comments.loadAll(lnk).done(function() {
                        showMessage(document.getElementById('comment-'+ ids[0]), 'comment');
                } else {
                    showMessage(document.getElementById('comment-'+ ids[0]), 'comment');
            // Make sure the hash is not the ID of the question.
            } else if (window.location.pathname.indexOf('/questions/' + cleanHash) !== 0) {
                if (!isNaN(Number.parseInt(cleanHash, 10))) {
                    showMessage(document.getElementById('answer-' + cleanHash), 'answer');

}(document || unsafeWindow.document, window || unsafeWindow, StackExchange || unsafeWindow.StackExchange ));

Or find it in the GitHub repo where you're invited to submit pull requests.

  • That thumbnail tho. May 21, 2017 at 14:33
  • 1
    @BhargavRao I'm not known for my artistic skills .. :(
    – rene
    May 21, 2017 at 14:34
  • we all know that flowers can't draw, @rene :/ May 21, 2017 at 14:36
  • Just used this recently and it's useful when fighting Smokey's posts! Just a small request, is it possible to show the message using StackExchange.notify.show("message") instead? Any opinion/reason?
    – Andrew T.
    Oct 21, 2017 at 11:57
  • @AndrewT. I just figured out how I can use that without sacrificing functionality. With you in the next 6 to 8 hours.
    – rene
    Oct 21, 2017 at 12:23
  • @AndrewT. the version which uses notify is now live in the github repo.
    – rene
    Oct 21, 2017 at 20:39


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