When using...
<!--[if lte IE 8]> <html class="ie8-7-6"> <![endif]-->
.ie8-7-6 .loginForm {display:none;} /* The login form is hidden. */
and
.ie8-7-6 .yourbrowserisold {display:block;} /* and some nice graphics
appear to indicate it doesn't support IE6, 7, or 8. */
So that works very nicely and I'm providing a link to download Chrome Frame.
But now, if Chrome Frame is installed, I would like it to do the oposite.
<!--[if CF]><html class="chrome-frame><![endif]-->
.chrome-frame .yourbrowserisold {display:none;}
.chrome-frame .loginForm {display:block;}
But
<!--[if CF]><html class="chrome-frame><![endif]-->
does not work and I need the login form to appear.
I've googled a few dozen websites and I can't find an answer if...
a. it is even possible with conditionals?
b. or is it only possible with javascript?
Any help?
-----Update---------- Here is a script to detect if Google Frame is installed or not.
$(document).ready(function() {
if( $.browser.chromeframe != window.externalHost) {alert("You are using chrome frame. You rock!"); }
else { alert("You are not using chrome frame."); }
});
FYI: You can add your own jQuery to the above script to target Chrome Frame users.
----- Demo: https://dev.clientwhys.com/index-dummy-ie.iml
The best way to detect that you're in Chrome Frame inside IE is checking for
var isChromeFrame = !!window.externalHost;
This is only available inside Chrome Frame. Currently there are no conditional comments-like construct for Chrome Frame.
But to your situation, if the user has Chrome Frame installed already and you're triggering it via a chrome=1 flag, then they'll never see any content inside of IE conditional comments.
来源：https://stackoverflow.com/questions/11908896/is-it-possible-to-use-conditional-comments-from-within-a-chrome-frame