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Hi, As you may know the onShouldStartLoadWithRequest is not working with FMX.TWebBrowser on Windows and Linux platforms. Is OK with Android and MacOS A bug report has been filled a long time (5 years ago) and reported again and again https://quality.embarcadero.com/browse/RSP-11206 27/May/15 2:08 AM https://quality.embarcadero.com/browse/RSP-24414/May/19 2:34 AM the actual status is " Unresolved" without any other reply or solution For me this event is very useful when I try to execute a delphi function from the web browser (javascript) EX: ==== HTML / JAVASCRIPT BROWSER <div id="fresult"></div> <button type="button" onclick="callDelphi()">Call delphi function</button> <script> function callDelphi(){ window.location.href='https://www.fake.com/?func=HiDelphi'; } function setResult(dresult){ document.getElementById('fresult').innerHTML=dresult; } </script> ==== DELPHI UNIT procedure TForm1.wb_ViewShouldStartLoadWithRequest(ASender: TObject; const URL: string); begin if pos('www.fake',url)>0 then begin wb_View.Stop; /// IMPORTANT here we stop the browser if pos('HiDelphi',URL)>0 then wb_View.EvaluateJavaScript('setResult('' Hi from Delphi '')'); end; end; I am just wondering if you have another solution to call a delphi function from FMX TWebBrowser (a cross platform solution) The example is working only with Android and MacOS . For Windows I have used Chromium FMX (another web browser component from https://github.com/salvadordf/CEF4Delphi) I need one source code for multiple platforms and at this moment this is not possible because of this bug Did you know how to create/modify/use other strategy with FMX.TWebBrowser to achieve this? - stop the browser before load/process any URL? Thank you in advance.