Tag <Meta http-equiv=“X-UA-Compatible” ..> for Iframe not works in IE8
Question
I got such structure of HTML for IE.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head></head>
<body id="body">
<div>
<iframe>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
<head></head>
<body>
<!-- Here goes some graphic content using dojo libs -->
</body>
<html>
</iframe>
</div>
</body>
<html>
When I insert to the both headers (main and header of iframe html) tag
<meta http-equiv="X-UA-Compatible" content="IE=8,IE=9"/>
nomatter what content inside a tag (IE=8 or IE=8,IE-9 or IE=EDGE etc)
the inner iframe doesn't generate under IE8 browser mode. But!! works fine under IE7 or IE9
When I remove the tag - works fine in all versions of IE.
Where is the problem? In DOCTYPE, the tag or elsewhere?
2 answers
solution1
3 2013-09-17 20:05:34
页面根据最顶层的帧进行渲染（浏览器模式在开头只设置一次，嵌套帧中的所有值都被忽略）。
solution2
1 2013-11-04 09:24:16
Through testing I can confirm rocky 's answer. I was able to get IE9 to render standards mode by changing the doctype of my topmost frame. I did not need to send the X-UA-Compatible header or meta tag.
Any frames inside the top one will not alter the mode, so my structure of
<!doctype html>
<html lang="en">
...
<iframe>
<!DOCTYPE HTML PUBLIC "-//W3C//Dtd HTML 4.0 transitional//en">
<html>
...
<iframe>
<!DOCTYPE html>
...
results in standards mode for all frames, including the third one where html5 is rendered correctly.
(yes yes, it's ugly, but unfortunately part of a fixed application).
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