Since the beginning of the IE8 browser, Microsoft has built developer tools in IE, which is probably rarely used by users. But small make up to say, although this is a developer tool, but there are a lot of practical "gadgets" Oh!
Click on the keyboard F12 can turn the tool on or off, and when you open developer tools, it appears below the IE browser window, and various utility gadgets can be opened from the menu bar.
In the file, you can set the program to view the source code of the Web page, such as Notepad, Word, EditPlus, FrontPage, and so on.
In the cache, you can do some processing for cookies and caching, such as deleting a Web site's cache and cookie information separately.
In the tool, you can accurately adjust the size of the IE window, open the ruler tool to measure the content of the Web page, and use the color picker to draw the color of a page somewhere.
When the Web page is not displaying correctly, you can switch to different browser modes (IE7, IE8, IE9) to open the Web page in the Explorer mode.
In fact, you do not see what to develop, these tools can be used as a small helper on the Internet.