為了兼容IE各個版本，需要在CSS中添加額外的代碼，比如以前常用的_width。之所以工作，是因為瀏覽器會忽略不能解析的樣式規則，因此舉個例子來說，把_width寫在width下面，對於非IE瀏覽器會解析到width，而對於IE6來說，會用_width覆蓋前面的width規則，從而達到針對IE6瀏覽器的兼容。對於IE其他版本(6~11)，也存在同樣的兼容性處理方法。
下面是一個速查表：
div {
property:value\0; /* ie 8/9*/
property:value\9\0; /* ie 9*/
*property:value; /* ie 7*/
_property:value; /* ie 6*/
}
IE 6
* html .ie6 {property:value;}
or
.ie6 { _property:value;}
IE 7
*+html .ie7 {property:value;}
or
*:first-child+html .ie7 {property:value;}
IE 6 and 7
@media screen\9 {
.ie67 {property:value;}}
or
.ie67 { *property:value;}
or
.ie67 { #property:value;}
IE 6, 7 and 8
@media \0screen\,screen\9 {
.ie678 {property:value;}}
IE 8
html>/**/body .ie8 {property:value;}
or
@media \0screen {
.ie8 {property:value;}}
IE 8 Standards Mode Only
.ie8 { property /*\**/: value\9 }
IE 8,9 and 10
@media screen\0 {
.ie8910 {property:value;}}
IE 9 only
@media screen and (min-width:0\0) and (min-resolution: .001dpcm) {
// IE9 CSS
.ie9{property:value;}}
IE 9 and above
@media screen and (min-width:0\0) and (min-resolution: +72dpi) {
// IE9+ CSS
.ie9up{property:value;}}
IE 9 and 10
@media screen and (min-width:0\0) {
.ie910{property:value\9;} /* backslash-9 removes ie11+ & old Safari 4 */}
IE 10 only
_:-ms-lang(x), .ie10 { property:value\9; }
IE 10 and above
_:-ms-lang(x), .ie10up { property:value; }
or
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
.ie10up{property:value;}}
IE 11 (and above..)
_:-ms-fullscreen, :root .ie11up { property:value; }