I am trying to target a class for IE. However, since the boilerplate template has changed this no longer works..
.myclass {
//do something
}
.ie7 .myclass {
///do something
}
This is what's in the new header of the boilerplate template.
<!doctype html>
<!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7" lang="en"> <![endif]-->
<!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8" lang="en"> <![endif]-->
<!--[if IE 8]> <html class="no-js lt-ie9" lang="en"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en"> <!--<![endif]-->
We do not recommend you target IE9 as it has all the marking of a modern browser, which is why we do not have IE9 specific conditional class. If you still would like to, you can use:
<!doctype html>
<!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7" lang="en"> <![endif]-->
<!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8" lang="en"> <![endif]-->
<!--[if IE 8]> <html class="no-js lt-ie9" lang="en"> <![endif]-->
<!--[if IE 9]> <html class="no-js lt-ie10" lang="en"> <![endif]-->
<!--[if gt IE 9]><!--> <html class="no-js" lang="en"> <!--<![endif]-->
Note that IE10 will not recognize conditional comments.
Yak Boilerplate! Anyway:
.lt-ie9.lt-ie8 .myclass {}
should do what you want.
EDIT
Sorry misread your question since you put IE7 in example. If you want to IE9 you can just do:
.myclass {}
来源：https://stackoverflow.com/questions/9233468/how-to-target-ie9-with-new-html5-boilerplate