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copied!<p>This message is shown by the underlying MSHTML engine if the web page handles <a href="http://msdn.microsoft.com/en-us/library/ie/ms536907%28v=vs.85%29.aspx" rel="nofollow noreferrer">window.onbeforeunload</a> event. Usually, it's there for a reason, to let the user know his/her input hasn't been saved or submitted yet. The prompt suppression script from <a href="https://stackoverflow.com/questions/10348692/supress-the-are-you-sure-you-want-to-leave-this-page-popup-in-the-net-webbrow">the answer you linked</a> doesn't work for cases when the page uses <code>addEventListener("beforeonload", handler)</code> or <code>attachEvent("onbeforeunload", handler)</code>. I don't think there's a reliable way of doing this, without resorting to low-level Windows hooks.</p> <p><strong>[UPDATE]</strong> The following script (look for "Inject this script") is a hack which aggressively suppresses the page's own handlers for <code>onbeforeunload</code> event, via <code>setInterval</code>. It should work in 99% of cases, but it still leaves a gap for the page to override <code>onbeforeonload</code> right before navigating away.</p> <pre><code><!DOCTYPE html> <html> <head> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <title></title> <script type="text/javascript"> window.attachEvent("onbeforeunload", function (ev) { window.event.returnValue = "onbeforeunload via window.attachEvent()"; }); window.addEventListener("beforeunload", function (ev) { window.event.returnValue = "onbeforeunload via window.addEventListener()"; }); window.onbeforeunload = function (ev) { window.event.returnValue = "onbeforeunload via window.onbeforeunload"; }; </script> <script type="text/javascript"> // // Inject this script // (function () { var onbeforeunloadHandler = function (ev) { if (ev) { if (ev.stopPropagation) ev.stopPropagation(); if (ev.stopImmediatePropagation) ev.stopImmediatePropagation(); ev.returnValue = undefined; } window.event.returnValue = undefined; } var handler = null; var intervalHandler = function () { if (handler) window.detachEvent("onbeforeunload", handler); // window.attachEvent works best handler = window.attachEvent("onbeforeunload", onbeforeunloadHandler); // handler = window.addEventListener("beforeunload", onbeforeunloadHandler); // handler = window.onload = onbeforeunloadHandler; }; window.setInterval(intervalHandler, 500); intervalHandler(); })(); </script> </head> <body> <a href="http://www.example.com">Go away</a> </body> </html> </code></pre> <p>To inject this script with Delphi, you'd probably need to resort to low-level <code>WebBrowser/MSHTML</code> COM interfaces, like <code>IWebBrowser2</code>, <code>IHTMLDocument2</code>, <code>IHTMLScriptElement</code>, in a very similar way it's done in the linked answer. With some more efforts, the same can also be done via late binding, using <code>IDispatch::GetIDsOfNames</code> and <code>IDispatch::Invoke</code> only. If you're asking for exact Delphi code, I don't have one. </p>

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