Hello T5-team, I am currently in the process of porting a T5.3 application to T5.5-beta (expecting the latter to become final soon). Altough the application is rather simple and does not provider any client side customizations, I do get into trouble with some JS-related stuff. The application's index page does not get loaded, the browser console complains: "(index):7 Uncaught TypeError: document.observe is not a function" This obviously relates to the following piece of source code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";><html data-debug-enabled="true" data-locale="de" xmlns="http://www.w3.org/1999/xhtml";> <head> <meta content="Apache Tapestry Framework (version 5.5.0-beta-3)" name="generator"/><meta content="text/html; charset=utf-8" http-equiv="content-type"/> <link href="/etbb-admin-gui/assets/ctx/15201258/images/favicon.ico" type="image/x-icon" rel="shortcut icon"/> <title>Title</title> <script type="text/javascript"> ==> document.observe("dom:loaded", function() { $("content").style.display = 'block'; }); </script> After some research I found out that the relevant call belongs to prototype.js which should still be supported in T5.5, shouldn't it? As I further found out, the include of prototype.js is still present in the page, but has been moved to the <body> part of the page as opposed to the <head> part where it was placed in T5.3. As I stated in earlier, we do not rely on any properietory JS extensions, so I would happily replace the Prototype dependency. I just don't know how. Any help appreciated. Lothar
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