Wonder how ? If you want to render a page or a website in all IE versions starting from 5.5, just try :
A Firefox extension can be found here. 
To add the service to your website paste this code on the body :
<form method="post" id="form" name="form" action="http://ipinfo.info/netrenderer/index.php"
accept-charset="utf-8" target="_blank">
<select name="browser" style="width: 145px;">
<option value="ie8">Internet Explorer 8</option>
<option value="ie7">Internet Explorer 7</option>
<option value="ie6" selected="selected">Internet Explorer 6</option>
<option value="ie55">Internet Explorer 5.5</option>
<option value="ie-mix">IE7-IE6 Mixed</option>
<option value="ie-diff">IE7-IE6 Difference</option></select>
<input name="url" id="url" value="http://" size="61" maxlength="240" type="text">
<input name="go" value="Render" type="submit">
</form>
Another extension for all browsers rendering is available here but it’s still experimental and needs a trial registration to BrowserCam Capture Service.
You can also test your page in 23 browsers with litmus but you’ll have to pay (Only IE7 and FF2 rendering are free)
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How to do a Chrome/Opera specific stylesheet
Tags: chrome specific css, chrome-only stylesheet, css conditional comments, css hacks, In-CSS hacks, Opera specific Css, opera-only stylesheet, specific stylesheets
You’ve probably wondered how to load specific CSS stylesheets for Chrome, Safari and Opera, some kind of <!–[if Chrome]> CSS conditional comment. Unfortunately these conditional comments work only with the IE Series.
There’s an easy PHP solution to recreate this behaviour for other browsers, the excellent browser detecting script remade by Chris Schuld, this script will let you use this kind of code in your XHTML views:
<?php $browser = $browser->getBrowser();?>
<?php if($browser == Browser::BROWSER_CHROME || $browser == Browser::BROWSER_SAFARI):?>
<link href=”css/chrome-safari.css” type=”text/css” rel=”stylesheet” />
<?php endif;?>
In this example I deliberately took Chrome/Safari: Using a very similar version of Webkit HTML Engine, both render quite closely web pages, so you can use the same CSS file for both of them.
There’s an exhaustive list of supported browsers, even the iPhone Safari version and Lynx
are handled by the script.