Conditional Comment

`` (Conditional Comment)

This Internet Explorer–specific comment style can be used to mask or include content, depending on the browser in play.

Standard Syntax

Hide content if not supported:

Show content if not supported:

<![if expression]> HTML <![endif]>

The expression language supported by conditional comments is relatively simple, consisting of browser type and version identifier, less-than and greater-than operators, and basic Boolean operators. The syntax is briefly overviewed in below Table.

Examples

<!--[if IE 5]>
<link rel="stylesheet" href="ie5.css" type="text/css" media="screen">
<![endif]-->
<!--[if lt IE 7]<p>You are using an old IE! Please upgrade.</p><![endif]-->
<!--[if gte IE 7]><p>Great, you are using IE 7 or greater.</p><![endif]-->

Standards	Browser
IE	The only currently available value to match is the string "IE", corresponding to Internet Explorer.
number	An integer or floating-point value corresponding to the version of the browser.
true	The Boolean constant value of true.
false	The Boolean constant value of false.
lt	Less-than operator; returns true if the first argument is less than the second argument.
lte	Less-than or equal operator; returns true if the first argument is less than or equal to the second argument.
gt	Greater-than operator; returns true if the first argument is greater than the second argument.
gte	Greater-than or equal operator; returns true if the first argument is greater than or equal to the second argument.
( )	Subexpression operators; used to put in parentheses individual components of a more complex expression that uses Boolean operators.
&	The Boolean AND operator returns true if all subexpressions evaluate to true.
	The Boolean OR operator returns true if any of the subexpressions evaluates to true.
!	Not operator reverses the Boolean meaning of any expression.

Microsoft’s Conditional Comment Syntax

Compatibility

Standards	Browser
No standards support	Internet Explorer 5++