https://bugs.winehq.org/show_bug.cgi?id=52727
--- Comment #1 from Sergey Bychkow sergey.bychkow@gmail.com --- Really the problem is with pure browser, even without embedding:
$ wine iexplore.exe file://Z:/Users/..../test1.html
This shows different result on Wine and Windows.
File test1.html is:
<html> <body> <script> document.write('window.Precious: '); var obj1 = window.Precious; document.write(obj1); document.write('<br>');
document.write('window.external: '); var obj2 = window.external; document.write(obj2); document.write('<br>');
document.write('window.external.MyPrecious: '); var obj3 = window.external.MyPrecious; document.write(obj3); document.write('<br>');
document.write('End of script'); </script> </body> </html>