<!-- example CSS classes applied to the page -->
<html class="ua-chrome ua-chrome-25 ua-chrome-25-0 ua-chrome-25-0-1364 ua-chrome-25-0-1364-172
	ua-desktop ua-desktop-macintosh
	ua-mac_os_x ua-mac_os_x-10 ua-mac_os_x-10-8 ua-mac_os_x-10-8-3
	ua-webkit ua-webkit-537 ua-webkit-537-22">
	...
</html>

UserAgent map...

UserAgent-sniffing is regarded as something to be used sparingly, but pragmatic developers know it is sometimes the simplest approach to fixing a particular browser's quirk. When it is, cssua.js produces a helper object as a side-effect which makes user-agent-siffing easier and more consistent.

An object map is also built which allows you to test the user agent from your script in a simplified manner that doesn't require string parsing. For example, this object is effectively produced:

cssua.userAgent = cssua.ua = {
	chrome: "25.0.1364.172",
	desktop: "macintosh",
	mac_os_x: "10.8.3",
	webkit: "537.22"
};

Examples

This makes applying slight layout differences a snap:

/* CssUserAgent lets you target specific browsers without resorting CSS hacks */
.foo
{
	background-image: url(foo.png);
	background-repeat: no-repeat;
	background-position: left top;
}

.ua-ie-5 .foo,
.ua-ie-6 .foo
{
	/* IE versions < 7.0 don't fully support transparent 24-bit PNGs */
	background-image: url(foo.gif);
}

Testing for older Internet Explorer has never been easier than

if (cssua.userAgent.ie < 8) { /* proof of Pareto principle here */ }

Or testing if is a mobile browser:

if (cssua.userAgent.mobile) { /* consider your audience */ }

Remember to convert a version String to a Number with parseFloat if the value isn't a simple number, e.g., it has multiple decimal points or trailing letters. Otherwise, JavaScript may interpret the value as NaN (not-a-number):

if (parseFloat(cssua.ua.chrome) > 101) { /* enter the Matrix */ }

Mobile browser detection

CssUserAgent helps detect the increasingly ambiguous category of mobile browsers. cssua.js adds specific classes when it detects mobile browsers:

<html class="... ua-mobile ua-mobile-iphone ...">...<html>

No Browser Hacks...

This technique also avoids all CSS hacks. It allows you to target the browser rendering engine (e.g. "ua-gecko"), or a specific browser (e.g. "ua-firefox"). The version can be targeted at the major version number (e.g. "ua-ie-5" includes 5.0, 5.5) or minor (e.g. "ua-ie-5-0" includes only 5.0) all the way down to a very specific case (e.g. "ua-chrome-8-0-552-224").

Future UserAgents...

This script understands the common structures of user agent strings enabling future user agent strings to simply work without changes. For example, when the early beta builds of Google Chrome were first released, it just worked.

Tested with

Keywords

FAQs

What is cssuseragent?

Is cssuseragent popular?

Is cssuseragent well maintained?

Package last updated on 19 Jan 2016

Did you know?

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

cssuseragent

.css{user:agent;}

Special CSS Classes...

UserAgent map...

Examples

Mobile browser detection

No Browser Hacks...

Future UserAgents...

Keywords

Related posts

ESLint Adds Official Support for Linting HTML

CISA Kills Off RSS Feeds for KEVs and Cyber Alerts

MCP Community Begins Work on Official MCP Metaregistry