如何在先前（IE7，IE5）渲染模式下设置IE8以实现向后兼容性

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„Versioning and Cross-document InteractionInternet Explorer 8 introduces the IE8 standards mode by default—this lets Web designers use the latest rendering features available in Internet Explorer 8. In addition to layout changes, IE8 standards mode will also affect the behavior of scripted APIs (DOM).
To opt-out of IE8 standards mode, the META tag may be used to obtain IE7 compatibility mode“

Take a look at http://code.google.com/p/ie7-js/ too.
This is a tiny JS library to makes IE versions behave like a standard browser.
  1. /* -- send as http header too -- */
  2. // in php
  3. header('X-UA-Compatible:IE=7');
  4.  
  5. <meta http-equiv="X-UA-Compatible" content="IE=7">
  6.  
  7. <meta http-equiv="X-UA-Compatible" content="IE=4">   <!-- IE5 mode -->
  8. <meta http-equiv="X-UA-Compatible" content="IE=7.5"> <!-- IE7 mode -->
  9. <meta http-equiv="X-UA-Compatible" content="IE=100"> <!-- IE8 mode -->
  10. <meta http-equiv="X-UA-Compatible" content="IE=a">   <!-- IE5 mode -->
  11.  
  12. <meta http-equiv="X-UA-Compatible" content="IE=7; IE=8" />
  13.  
  14. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN">
  15. <html>
  16. <head>
  17.   <!-- Choose IE7 mode -->
  18.   <meta http-equiv="X-UA-Compatible" content="IE=7" />
  19.   <title>My Web Page</title>
  20. </head>
  21. <body>
  22.   <p>Content goes here.</p>
  23. </body>

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