1.webbrowser调用的就是本机IE，并且webbrowser默认就是运行在IE7 mode下，除非你改变它.

2.不装IE，无法用webbrowser.

3.设置WebBrowser在IE9 mode下工作呢

There are two different sets of keys for 32 bit and 64 bit applications.

32 bit:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_BROWSER_EMULATION

Value Key: yourapplication.exe

64 bit:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_BROWSER_EMULATION

Value Key: yourapplication.exe

The value to set this key to is (taken from MSDN here) as decimal values:

9999 (0x270F) 
Internet Explorer 9. Webpages are displayed in IE9 Standards mode, regardless of the !DOCTYPE directive.

9000 (0x2328) 
Internet Explorer 9. Webpages containing standards-based !DOCTYPE directives are displayed in IE9 mode.

8888 (0x22B8) 
Webpages are displayed in IE8 Standards mode, regardless of the !DOCTYPE directive.

8000 (0x1F40) 
Webpages containing standards-based !DOCTYPE directives are displayed in IE8 mode.

7000 (0x1B58) 
Webpages containing standards-based !DOCTYPE directives are displayed in IE7 Standards mode.

参考:

http://www.cnblogs.com/liuzhendong/archive/2012/03/21/2410107.html

Webbrowser控件中屏蔽弹出脚本错误对话框

http://www.cnblogs.com/qqflying/archive/2012/07/25/2607881.html

经验总结：WebBrowser自动点击弹出提示框alert、弹出对话框confirm、屏蔽弹出框、屏蔽弹出脚本错误的解决办法

http://www.cnblogs.com/qqflying/archive/2012/07/25/2608038.html

利用webBrowser获取页面iframe中的内容

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dWebBrowser常用知识点