<html> <head> <script> function log(message) { document.getElementById("result").innerHTML += message + "<br>"; } function loadJSFile(){ var s = document.createElement('script') s.setAttribute("type", "text/javascript") s.setAttribute("src", "resources/load-deferrer-script-element.js") document.getElementsByTagName("head")[0].appendChild(s); } jsLoaded = false; runningModal = false; // This line will load external script into memory. loadJSFile(); function runModal() { jsLoaded = true; loadJSFile(); runningModal = true; alert("Scripts should not be running in the background!"); runningModal = false; } </script> </head> <body> <p>This tests the bug https://bugs.webkit.org/show_bug.cgi?id=38910. Click the button, wait 5 seconds and close it. The test passes if no error messages show up in the page!</p> <input id="button" type="button" value="click me" onclick="runModal()"/> <p id="result"></p> </body> </html>