CSS Hacks- The good, the bad, and the ugly, 24html

Syntax

The syntax for conditional comments is as follows:

Positive

<!--[if condition]> HTML <![endif]-->

Negative

<!--[if !condition]><![IGNORE[--><![IGNORE[]]> HTML <!--<![endif]-->

condition is one of the following:

IE

Any version of IE

lt IE version

Versions less than version

lte IE version

Versions less than or equal to version

IE version

Only version version

gte IE version

Versions greater than or equal to version

gt IE version

Versions greater than version

version is the version of Internet Explorer, typically 5, 5.5, 6, or 7

HTML is the HTML to be included if the condition does or doesn't match, depending on the type of conditional comment. When included, the HTML is placed right where the conditional comment is in the source.

For negative conditions, <![IGNORE[--><![IGNORE[]]> can be replaced with --> if the condition is simply IE. The longer version is only needed when Internet Explorer might parse the contents.

The <![IGNORE[ ... ]]> directive is not available in XML, so it is illegal to use it in XHTML. A solution would be to split it up into two special conditional comments: <!--[if !condition]> XHTML <![endif]--> <!--[if !IE]>--> XHTML <!--<![endif]--> where XHTML is the same both places. Note that Internet Explorer 7 and below don't yet recognize XHTML as a form of XML, so this is merely forward-looking.