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IE conditional comments are a non-standard logical statement provided by Microsoft since IE5. Its function is to flexibly import different HTML elements for different IE versions of browsers. Obviously, the biggest advantage of this method is that it is a compatible solution officially given by Microsoft and can also identify IE
Because starting from IE10, the IE browser no longer Conditional comments are now supported. Therefore, the following writing method can only recognize IE9-browser
[Note] There must be no space between the two -- and the left bracket [, otherwise it will be invalid
<!--[if IE]> <p class="box" id="box"></p> <![endif]-->
6 [if IE 6] 7 [if IE 7] 8 [if IE 8] 9 [if IE 9]
<!--[if IE 7]> <p class="box" id="box"></p> <![endif]-->
gt 大于 gte 大于等于 lt 小于 lte 小于等于
<!--[if lte IE 7]> <p class="box" id="box"></p> <![endif]-->
Actually recognizes IE10+ browsers and other non-IE browsers
-[if !IE]> <p class="box" id="box"></p> <![endif]-->
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