Detect The Visitor’s Browser Using A Hook:

The problem.
Cross-browser compatibility is probably the most common problem in Web development. You will save yourself a lot of headaches if you are able to detect the browsers that people use to visit your website and then create a custom class wrapped in the body tag. Few people are aware of it, but WordPress can already detect browsers, and a few global variables are available for us to use.

The solution.
Nothing hard here: just paste the code below in your functions.php file, then save the file and you’re done!

function browser_body_class($classes) {
	global $is_lynx, $is_gecko, $is_IE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone;

	if($is_lynx) $classes[] = 'lynx';
	elseif($is_gecko) $classes[] = 'gecko';
	elseif($is_opera) $classes[] = 'opera';
	elseif($is_NS4) $classes[] = 'ns4';
	elseif($is_safari) $classes[] = 'safari';
	elseif($is_chrome) $classes[] = 'chrome';
	elseif($is_IE) $classes[] = 'ie';
	else $classes[] = 'unknown';

	if($is_iphone) $classes[] = 'iphone';
	return $classes;

Once you have saved the file, the function will automatically add a CSS class to the body tag, as shown in the example below:

<body class="home blog logged-in safari">

Code explanation.
WordPress has global variables that return true if a visitor is using a particular browser. If the visitor’s browser is Google Chrome, the $is_chrome variable will return true. This is why we create the browser_body_class() function, which returns the name of the visitor’s browser. Once that’s done, we just hook the function to WordPress’ body_class() function.

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