Dealing with different browsers is always an issue to most of the web developers. sometimes there is no reasonable way to accomplish a desired layout in all major browsers without the use of some special exception rules for certain layout engines.
hacks necessarily lead to potentiial complications and should be avoided whenever possible, but when the circumstances require hacks to be used.it's best to know what your options are and weigh the consequences appropriately. The purpose of this article is to describe some of the CSS hacks, also called CSS filters, with the least significant potential consequences.
Conditional comments
Due to its relatively poor level of standards support, Internet Explorer tends to be the subject of most CSS hacks. Luckily, as of version 5, it deliberately supports a rather safe-to-use hack called "conditional comments". Conditional comments are specially constructed HTML comments that Internet Explorer on Windows may treat differently from other browsers, optionally based on IE's version number. They can cause Internet Explorer to ignore the markup between comments or to include part of a comment as if it was regular markup. Conditional comments apply specifically to browsers using Internet Explorer's Trident layout engine, meaning IE-based browsers like Maxthon and Avant handle them like Internet Explorer does while browsers using other layout engines see them simply as regular comments. Internet Explorer on the Mac uses a different layout engine and doesn't support conditional comments.
The most beneficial aspect of conditional comments is that you are not relying on browser bugs when using them. When you use CSS hacks that rely on browser bugs, you run into the possibility of those bugs being fixed at an unwanted time or other browsers showing the same bugs. Conditional comments only work in browsers that specifically support them and claim to be based on Internet Explorer, which in this case all known browsers are honest about.
There are two forms of conditional comments: positive and negative. A positive conditional comment will expose the included markup only to web browsers that match the condition (meaning only the selected versions of Internet Explorer). A negative conditional comment will expose the markup only to web browsers that don't match the condition (meaning all non-IE web browsers and any versions of IE that the condition didn't match). Note that, since versions of IE older than IE 5 don't support conditional comments, you may get unexpected results in those browsers.
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.
Fixing stand-alone versions of Internet Explorer
Internet Explorer was not designed to allow multiple versions to be installed at once, and Microsoft doesn't officially support any such configurations. If you use one of the hacked third party packages that attempts to do this, you will experience problems with version-specific conditional comments, among other things. This is because the different stand-alone copies still rely on a common centralized registry for certain data, including version information.
Although there is no simple way to cut through all of the issues with stand-alone versions of Internet Explorer, it is possible to force them to look elsewhere for their version information, thus fixing this issue with conditional comments. The trick is to remove the normal centralized version indicator. To do this, first open up regedit.exe from the "Run..." dialog. Navigate to HKEY_LOCAL_MACHINE/Software/Microsoft/Internet Explorer/Version Vector/ (If HKEY_LOCAL_MACHINE doesn't exist, try HKLM instead). In the right pane, you should see a row with a Name value of IE. Rename this by clicking on it and changing it to zIE (or anything unique and different). Restart Internet Explorer to see the effects. Now when it looks for the IE key for its version information, the key will be missing and it will be forced to determine the correct version number from its own module.
Stand-alone versions of Internet Explorer have a number of other issues, and it therefore may be better to instead use a separate virtual machine for each version of Internet Explorer to ensure that what you see is what your users will see. I recommend VMware Server, which is completely free of charge and fairly easy to set up.
Conditional comments as a CSS hack
Conditional comments can be used as a CSS hack by including links to stylesheets based on the layout engine. Here is an example of how stylesheets can be separated in this way:
<!CDATA[
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<link href="all_browsers.css" rel="stylesheet" type="text/css">
<!--[if IE]> <link href="ie_only.css" rel="stylesheet" type="text/css"> <![endif]-->
<!--[if lt IE 7]> <link href="ie_6_and_below.css" rel="stylesheet" type="text/css"> <![endif]-->
<!--[if !lt IE 7]><![IGNORE[--><![IGNORE[]]> <link href="recent.css" rel="stylesheet" type="text/css"> <!--<![endif]-->
<!--[if !IE]>--> <link href="not_ie.css" rel="stylesheet" type="text/css"> <!--<![endif]-->
In the above example, all_browsers.css applies to all browsers, ie_only.css only applies to all versions of Internet Explorer, ie_6_and_below.css applies to all versions of Internet Explorer below IE 7, recent.css applies to all browsers except IE versions below 7, and not_ie.css applies to all non-IE browsers.
See also: Conditional Comments of IE
some more info
The syntax I use is:
<p><!--[if IE]>
According to the conditional comment this is Internet Explorer<br />
<![endif]-->
<!--[if IE 5]>
According to the conditional comment this is Internet Explorer 5<br />
<![endif]-->
<!--[if IE 5.0]>
According to the conditional comment this is Internet Explorer 5.0<br />
<![endif]-->
<!--[if IE 5.5]>
According to the conditional comment this is Internet Explorer 5.5<br />
<![endif]-->
<!--[if IE 6]>
According to the conditional comment this is Internet Explorer 6<br />
<![endif]-->
<!--[if IE 7]>
According to the conditional comment this is Internet Explorer 7<br />
<![endif]-->
<!--[if gte IE 5]>
According to the conditional comment this is Internet Explorer 5 and up<br />
<![endif]-->
<!--[if lt IE 6]>
According to the conditional comment this is Internet Explorer lower than 6<br />
<![endif]-->
<!--[if lte IE 5.5]>
According to the conditional comment this is Internet Explorer lower or equal to 5.5<br />
<![endif]-->
<!--[if gt IE 6]>
According to the conditional comment this is Internet Explorer greater than 6<br />
<![endif]-->
</p>
CSS hack?
Are conditional comments CSS hacks? Strictly speaking, yes, since they can serve to give special style instructions to some browsers. However, they do not rely on one browser bug to solve another one, as all true CSS hacks do. Besides, they can be used for more than CSS hacks only (though that rarely happens).
Since conditional comments are not based on a browser hack but on a deliberate feature I believe they are safe to use. Sure, other browsers could implement conditional comments, too (though as yet none have done so), but they're unlikely to react to the specific query <!--[if IE]>.
I use conditional comments, though sparingly. First I see if I can find a real CSS solution to an Explorer Windows problem. If I can't, though, I don't hesitate to use them.
Comment tag
A reader told me Explorer (Windows and Mac) supports the (non-standard) <comment> tag.
<p>This is <comment>not</comment> Internet Explorer.</p>
This is Internet Explorer.
This tag might come in handily if you want to use tags or styles for all non-Explorer browsers. Unfortunately these situations are rather scarce, especially since both Explorer Windows and Mac support this tag and you usually want to serve special content or style to only one of them.
ASP.NET HACKS
http://wiki.lessthandot.com/index.php/ASP.NET_Hacks
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