HTML and CSS Reference
In-Depth Information
Standard Syntax
Hide content if not supported:
<!--[if
expression
]>
HTML
<![endif]-->
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 Table 3-7.
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]-->
Item
Description
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.
T
ABLE
3-7 Microsoft's Conditional Comment Syntax
