The Difference of IE7 and IE6

Today , I study the official document and blog of IE7,find some issue,Javascript issue:

 

    1 window.opener and window.close--Internet Explorer 7 no longer allows the window.opener trick to  bypass the window.close prompt. Browser windows cannot close themselves unless the windows were created in script. This security enhancement no longer allows browsing to a random site when the main browser window closes unexpectedly.

 

    2  Security Settings for Script Access to the Clipboard--New security-related updates for Microsoft Internet Explorer 7 include a change in the default security settings for Script Access to the clipboard. Sites using scripts to access the clipboard in the Internet and Trusted sites zones will receive a prompt that will inform the user that their clipboard is being accessed by script. The prompt will require user permission to continue. Giving permission will allow the website to save   information to the clipboard, and read any existing information from the clipboard. This security setting is designed to help prevent the possibility of information disclosure through script access  to the clipboard.

    css issue:

 

       The issues of css are sundry and hard to be classified : click this link for detail:

 

    http://blogs.msdn.com/ie/archive/2006/08/22/712830.aspx

  Applet:
          IE7 allows the applet running by default.        
 
  Dhtml:
        According to the official documents, IE7 disables Dynamic HTML (DHTML) scriptlets by default They can be re-enabled by system administrators by changing the advanced settings in the Internet Control Panel.  And the javascript runtime library of IE7 extends from that of IE6.So if the js code can run on IE6, it also works on IE7.
 
 
  ActiveX:
       The release note of IE7  descript” The IE 7 ActiveX Opt-In feature is disabled by default. When the user visits a webpage that is trying to use a disabled ActiveX control, they see an Information bar to enable the control” .