Modernizr Documentation

What is Modernizr?

Modernizr is a small piece of JavaScript code that automatically detects the availability of next-generation web technologies in your user's browsers. Rather than blacklisting entire ranges of browsers based on “UA sniffing,” Modernizr uses feature detection to allow you to easily tailor your user's experiences based on the actual capabilities of their browser.

With this knowledge that Modernizr gives you, you can take advantage of these new features in the browsers that can render or utilize them, and still have easy and reliable means of controlling the situation for the browsers that cannot.

What is feature detection?

In the dark ages of web development, we often had to resort to UA sniffing in order to determine if their user's would be able to make use of Awesome-New-Feature™. In practice, that means doing something like the following

  if (browser === "the-one-they-make-you-use-at-work") {
    getTheOldLameExperience();
  } else {
    showOffAwesomeNewFeature();
  }

Now that looks ok, right? We are using Awesome-New-Feature™, and of course it isn't supported in an old crusty browser like that, right? That could very well be the case - today. But what if the next version of that browser adds support for Awesome-New-Feature™? Now you have to go back and audit your code, updating every single place that you are doing this check. That is assuming that you have the time to find out about every feature update for every single browser. Worse still, until you realize that it actually works in the newest version, all of those users back at the office getTheOldLameExperience, for no reason whatsoever.

Those users - given a substandard website for apparently no reason - can actually go into their browser and OS settings and change the name of the browser (or user-agent - what we compare against in code when performing a UA sniff) to whatever they would like. At that point - your code is meaningless. You are blocking out users who may actually support all of your features, and possibly letting those in who don't. Nearly everyone gets a broken experience. There has to be a better way!

There is, and it is called Feature Detection, and it looks more like this

  if (Modernizr.awesomeNewFeature) {
    showOffAwesomeNewFeature();
  } else {
    getTheOldLameExperience();
  }

Rather than basing your decisions on whether or not the user is on the one-they-make-you-use-at-work browser, and assuming that means they either do or do not have access to Awesome-New-Feature™, feature detection actually programmatically checks if Awesome-New-Feature™ works in the browser, and gives you either a true or false result. So now as soon as your least favorite browser adds support for Awesome-New-Feature™, your code works there - automatically! No more having to update, ever. The code ends up being similar, but much more clear to its actual intention

Downloading Modernizr

A lot has changed since the last version of Modernizr. There no longer is a single, base modernizr.js file. Instead, just head over to the Download page as you could have previously, and select the features you want to use in your project. This way we can provide the smallest file possible, which means a faster website for you. Once you have done that, just hit the Build button and you’ve got your own custom build of Modernizr, hot off the presses!

You may notice that in addition to the Build output, where you have been able to download custom builds one at a time for years now - there are two new options.

Command Line Config

Since 3.0, Modernizr also ships its build system as a node module on npm. That means that you can quickly create multiple builds of Modernizr for different projects, without even having to open a new browser tab.

Once you have npm installed, you can install the Modernizr command line tool by running

npm install -g modernizr

Now you are ready to get your start making your custom build! You can download the configuration file from the build menu (under "Command Line Config"). This will give you a JSON file that you will give to the Modernizr module to make your custom build.

modernizr -c modernizr-config.json

_{Note that you will need to give the command line config the file path to the configuration you downloaded from the site. In the above example, we are running the modernizr command from the same folder that we downloaded the modernizr-config.json file to.}

Grunt Config

If you do not want to manually run your build from the command line every time you update your site, you also have the option to download a Grunt task to do it for you. This configuration file can be used with grunt-modernizr to automatically build your custom version. Just add it to your Gruntfile, and you are off to the races.

_{Note that you will need to update the provided configuration file with paths to the devFile and outputFile. More documentation is available for grunt-modernizr here}

Configuration Options

In addition to the available options and feature detects, there are a handful of additional configuration options.

classPrefix - default: ""

A string that is added before each CSS class.

enableJSClass - default: true

Whether or not to update .no-js to .js on the root element.

enableClasses - default: true

Whether or not Modernizr should add its CSS classes at all

See the next section for more information on those options

Using Modernizr with CSS

Modernizr's classes

By default, Modernizr sets classes for all of your tests on the root element (<html> for websites). This means adding the class for each feature when it is supported, and adding it with a no- prefix when it is not (e.g. .feature or .no-feature). This makes it super simple to add features in via progressive enhancement!

Say you include Modernizr's detection for CSS gradients. Depending on the browser, it will result in either <html class="cssgradients"> or <html class="no-cssgradients">. Now that you know those two states, you can write CSS to cover both cases

.no-cssgradients .header {
  background: url("images/glossybutton.png");
}

.cssgradients .header {
  background-image: linear-gradient(cornflowerblue, rebeccapurple);
}

classPrefix

If one of Modernizr's class names clashes with one of your preexisting classes, you have the option to add a classPrefix inside of your config. Consider the hidden detect, which adds a .hidden class - something a lot of code bases already use to, well, hide things. If you wanted to use that specific detection, you could use the following as your configuration

{
  "classPrefix": "foo-",
  "feature-detects": ["dom/hidden"]
}

This would mean that rather than <html class="hidden">, you would get <html class="foo-hidden">.

no-js

By default, Modernizr will rewrite <html class="no-js"> to <html class="js">. This lets hide certain elements that should only be exposed in environments that execute JavaScript. If you want to disable this change, you can set enableJSClass to false in your config.

enableClasses

If you are using a classPrefix, such as supports-, then you must include that prefix on your html element. ie. supports-no-js instead of no-js.

Finally, if you do not want Modernizr to add any of it's classes, you can set enableClasses to false. This does not effect the .no-js update, so if you do not want that updated either you will need to set enableJSClass to false in your configuration.

Using Modernizr with JavaScript

The Modernizr object

Modernizr keeps track of the results of all of it's feature detections via the Modernizr object. That means that for each test, a corresponding property will be added. You just have to test for truthiness in your code to figure out what you want to do

  if (Modernizr.awesomeNewFeature) {
    showOffAwesomeNewFeature();
  } else {
    getTheOldLameExperience();
  }

Helper methods

Modernizr optionally exposes a number of additional functions, that you can read more about in Modernizr API

Modernizr API

Modernizr.on

Modernizr.on(feature,cb)

Modernizr.on('flash', function( result ) {
  if (result) {
   // the browser has flash
  } else {
    // the browser does not have flash
  }
});

Modernizr.addTest

Modernizr.addTest(feature,test)

The most common way of creating your own feature detects is by calling Modernizr.addTest with a string (preferably just lowercase, without any punctuation), and a function you want executed that will return a boolean result

Modernizr.addTest('itsTuesday', function() {
 var d = new Date();
 return d.getDay() === 2;
});

When the above is run, it will set Modernizr.itstuesday to true when it is tuesday, and to false every other day of the week. One thing to notice is that the names of feature detect functions are always lowercased when added to the Modernizr object. That means that Modernizr.itsTuesday will not exist, but Modernizr.itstuesday will. Since we only look at the returned value from any feature detection function, you do not need to actually use a function. For simple detections, just passing in a statement that will return a boolean value works just fine.

Modernizr.addTest('hasJquery', 'jQuery' in window);

Just like before, when the above runs Modernizr.hasjquery will be true if jQuery has been included on the page. Not using a function saves a small amount of overhead for the browser, as well as making your code much more readable. Finally, you also have the ability to pass in an object of feature names and their tests. This is handy if you want to add multiple detections in one go. The keys should always be a string, and the value can be either a boolean or function that returns a boolean.

var detects = {
 'hasjquery': 'jQuery' in window,
 'itstuesday': function() {
   var d = new Date();
   return d.getDay() === 2;
 }
}
Modernizr.addTest(detects);

There is really no difference between the first methods and this one, it is just a convenience to let you write more readable code.

Modernizr.atRule

Modernizr.atRule(prop)

 var keyframes = Modernizr.atRule('@keyframes');
 if (keyframes) {
   // keyframes are supported
   // could be `@-webkit-keyframes` or `@keyframes`
 } else {
   // keyframes === `false`
 }

Modernizr._domPrefixes

Modernizr._domPrefixes is exactly the same as _prefixes, but rather than kebab-case properties, all properties are their Capitalized variant

Modernizr._domPrefixes === [ "Moz", "O", "ms", "Webkit" ];

Modernizr.hasEvent

Modernizr.hasEvent(eventName,[element])

Modernizr.hasEvent lets you determine if the browser supports a supplied event. By default, it does this detection on a div element

 hasEvent('blur') // true;

However, you are able to give an object as a second argument to hasEvent to detect an event on something other than a div.

 hasEvent('devicelight', window) // true;

Modernizr.mq

Modernizr.mq(mq)

Modernizr.mq allows for you to programmatically check if the current browser window state matches a media query.

 var query = Modernizr.mq('(min-width: 900px)');
 if (query) {
   // the browser window is larger than 900px
 }

Only valid media queries are supported, therefore you must always include values with your media query

// good
 Modernizr.mq('(min-width: 900px)');
// bad
 Modernizr.mq('min-width');

If you would just like to test that media queries are supported in general, use

 Modernizr.mq('only all'); // true if MQ are supported, false if not

Note that if the browser does not support media queries (e.g. old IE) mq will always return false.

Modernizr.prefixed

Modernizr.prefixed(prop,[obj],[elem])

Modernizr.prefixed takes a string css value in the DOM style camelCase (as opposed to the css style kebab-case) form and returns the (possibly prefixed) version of that property that the browser actually supports. For example, in older Firefox...

prefixed('boxSizing')

returns 'MozBoxSizing' In newer Firefox, as well as any other browser that support the unprefixed version would simply return boxSizing. Any browser that does not support the property at all, it will return false. By default, prefixed is checked against a DOM element. If you want to check for a property on another object, just pass it as a second argument

var rAF = prefixed('requestAnimationFrame', window);
raf(function() {
 renderFunction();
})

Note that this will return the actual function - not the name of the function. If you need the actual name of the property, pass in false as a third argument

var rAFProp = prefixed('requestAnimationFrame', window, false);
rafProp === 'WebkitRequestAnimationFrame' // in older webkit

One common use case for prefixed is if you're trying to determine which transition end event to bind to, you might do something like...

var transEndEventNames = {
    'WebkitTransition' : 'webkitTransitionEnd', * Saf 6, Android Browser
    'MozTransition'    : 'transitionend',       * only for FF < 15
    'transition'       : 'transitionend'        * IE10, Opera, Chrome, FF 15+, Saf 7+
};
var transEndEventName = transEndEventNames[ Modernizr.prefixed('transition') ];

If you want a similar lookup, but in kebab-case, you can use prefixedCSS.

Modernizr.prefixedCSS

Modernizr.prefixedCSS(prop)

Modernizr.prefixedCSS is like Modernizr.prefixed, but returns the result in hyphenated form

Modernizr.prefixedCSS('transition') // '-moz-transition' in old Firefox

Since it is only useful for CSS style properties, it can only be tested against an HTMLElement. Properties can be passed as both the DOM style camelCase or CSS style kebab-case.

Modernizr.prefixedCSSValue

Modernizr.prefixedCSSValue(prop,value)

Modernizr.prefixedCSSValue is a way test for prefixed css properties (e.g. display: -webkit-flex)

Modernizr.prefixedCSSValue('background', 'linear-gradient(left, red, red)')

Modernizr._prefixes

Modernizr._prefixes is the internal list of prefixes that we test against inside of things like prefixed and prefixedCSS. It is simply an array of kebab-case vendor prefixes you can use within your code. Some common use cases include Generating all possible prefixed version of a CSS property

var rule = Modernizr._prefixes.join('transform: rotate(20deg); ');
rule === 'transform: rotate(20deg); webkit-transform: rotate(20deg); moz-transform: rotate(20deg); o-transform: rotate(20deg); ms-transform: rotate(20deg);'

Generating all possible prefixed version of a CSS value

rule = 'display:' +  Modernizr._prefixes.join('flex; display:') + 'flex';
rule === 'display:flex; display:-webkit-flex; display:-moz-flex; display:-o-flex; display:-ms-flex; display:flex'

Modernizr.testAllProps

Modernizr.testAllProps(prop,[value],[skipValueTest])

testAllProps determines whether a given CSS property, in some prefixed form, is supported by the browser.

testAllProps('boxSizing')  // true

It can optionally be given a CSS value in string form to test if a property value is valid

testAllProps('display', 'block') // true
testAllProps('display', 'penguin') // false

A boolean can be passed as a third parameter to skip the value check when native detection (@supports) isn't available.

testAllProps('shapeOutside', 'content-box', true);

Modernizr.testProp

Modernizr.testProp(prop,[value],[useValue])

Just like testAllProps, only it does not check any vendor prefixed version of the string. Note that the property name must be provided in camelCase (e.g. boxSizing not box-sizing)

Modernizr.testProp('pointerEvents')  // true

You can also provide a value as an optional second argument to check if a specific value is supported

Modernizr.testProp('pointerEvents', 'none') // true
Modernizr.testProp('pointerEvents', 'penguin') // false

Modernizr.testStyles

Modernizr.testStyles(rule,callback,[nodes],[testnames])

Modernizr.testStyles takes a CSS rule and injects it onto the current page along with (possibly multiple) DOM elements. This lets you check for features that can not be detected by simply checking the IDL.

Modernizr.testStyles('#modernizr { width: 9px; color: papayawhip; }', function(elem, rule) {
  // elem is the first DOM node in the page (by default #modernizr)
  // rule is the first argument you supplied - the CSS rule in string form
  addTest('widthworks', elem.style.width === '9px')
});

If your test requires multiple nodes, you can include a third argument indicating how many additional div elements to include on the page. The additional nodes are injected as children of the elem that is returned as the first argument to the callback.

Modernizr.testStyles('#modernizr {width: 1px}; #modernizr2 {width: 2px}', function(elem) {
  document.getElementById('modernizr').style.width === '1px'; // true
  document.getElementById('modernizr2').style.width === '2px'; // true
  elem.firstChild === document.getElementById('modernizr2'); // true
}, 1);

By default, all of the additional elements have an ID of modernizr[n], where n is its index (e.g. the first additional, second overall is #modernizr2, the second additional is #modernizr3, etc.). If you want to have more meaningful IDs for your function, you can provide them as the fourth argument, as an array of strings

Modernizr.testStyles('#foo {width: 10px}; #bar {height: 20px}', function(elem) {
  elem.firstChild === document.getElementById('foo'); // true
  elem.lastChild === document.getElementById('bar'); // true
}, 2, ['foo', 'bar']);

Features detected by Modernizr

Detect	CSS class/JS property
Ambient Light Events	ambientlight
Detects support for the API that provides information about the ambient light levels, as detected by the device's light detector, in terms of lux units.
Application Cache	applicationcache
Detects support for the Application Cache, for storing data to enable web-based applications run offline. The API has been heavily criticized and discussions are underway to address this.
HTML5 Audio Element	audio
Detects the audio element
Battery API	batteryapi
Detect support for the Battery API, for accessing information about the system's battery charge level.
Blob constructor	blobconstructor
Detects support for the Blob constructor, for creating file-like objects of immutable, raw data.
Canvas	canvas
Detects support for the `<canvas>` element for 2D drawing.
Canvas text	canvastext
Detects support for the text APIs for `<canvas>` elements.
Content Editable	contenteditable
Detects support for the `contenteditable` attribute of elements, allowing their DOM text contents to be edited directly by the user.
Context menus	contextmenu
Detects support for custom context menus.
Cookies	cookies
Detects whether cookie support is enabled.
Cross-Origin Resource Sharing	cors
Detects support for Cross-Origin Resource Sharing: method of performing XMLHttpRequests across domains.
Web Cryptography	cryptography
Detects support for the cryptographic functionality available under window.crypto.subtle
Custom Elements API	customelements
Detects support for the Custom Elements API, to create custom html elements via js
Custom protocol handler	customprotocolhandler
Detects support for the `window.registerProtocolHandler()` API to allow websites to register themselves as possible handlers for particular protocols.
CustomEvent	customevent
Detects support for CustomEvent.
Dart	dart
Detects native support for the Dart programming language.
DataView	dataview
Detects support for the DataView interface for reading data from an ArrayBuffer as part of the Typed Array spec.
Emoji	emoji
Detects support for emoji character sets.
Event Listener	eventlistener
Detects native support for addEventListener
EXIF Orientation	exiforientation
Detects support for EXIF Orientation in JPEG images. iOS looks at the EXIF Orientation flag in JPEGs and rotates the image accordingly. Most desktop browsers just ignore this data.
Flash	flash
Detects Flash support as well as Flash-blocking plugins
Force Touch Events	forcetouch
Tests whether the browser supports the detection of Force Touch Events. Force Touch Events allow custom behaviours and interactions to take place based on the given pressure or change in pressure from a compatible trackpad. Force Touch events are available in OS X 10.11 and later on devices equipped with Force Touch trackpads.
Fullscreen API	fullscreen
Detects support for the ability to make the current website take over the user's entire screen
GamePad API	gamepads
Detects support for the Gamepad API, for access to gamepads and controllers.
Geolocation API	geolocation
Detects support for the Geolocation API for users to provide their location to web applications.
Hashchange event	hashchange
Detects support for the `hashchange` event, fired when the current location fragment changes.
Hidden Scrollbar	hiddenscroll
Detects overlay scrollbars (when scrollbars on overflowed blocks are visible). This is found most commonly on mobile and OS X.
History API	history
Detects support for the History API for manipulating the browser session history.
HTML Imports	htmlimports
Detects support for HTML import, a feature that is used for loading in Web Components.
IE8 compat mode	ie8compat
Detects whether or not the current browser is IE8 in compatibility mode (i.e. acting as IE7).
IndexedDB	indexeddb
Detects support for the IndexedDB client-side storage API (final spec).
IndexedDB Blob	indexeddbblob
Detects if the browser can save File/Blob objects to IndexedDB
Input attributes	input
Detects support for HTML5 `<input>` element attributes and exposes Boolean subproperties with the results: `Modernizr.input.autocomplete Modernizr.input.autofocus Modernizr.input.list Modernizr.input.max Modernizr.input.min Modernizr.input.multiple Modernizr.input.pattern Modernizr.input.placeholder Modernizr.input.required Modernizr.input.step`
input[search] search event	search
There is a custom `search` event implemented in webkit browsers when using an `input[search]` element.
Form input types	inputtypes
Detects support for HTML5 form input types and exposes Boolean subproperties with the results: `Modernizr.inputtypes.color Modernizr.inputtypes.date Modernizr.inputtypes.datetime Modernizr.inputtypes['datetime-local'] Modernizr.inputtypes.email Modernizr.inputtypes.month Modernizr.inputtypes.number Modernizr.inputtypes.range Modernizr.inputtypes.search Modernizr.inputtypes.tel Modernizr.inputtypes.time Modernizr.inputtypes.url Modernizr.inputtypes.week`
Internationalization API	intl
Detects support for the Internationalization API which allow easy formatting of number and dates and sorting string based on a locale
JSON	json
Detects native support for JSON handling functions.
Font Ligatures	ligatures
Detects support for OpenType ligatures
Reverse Ordered Lists	olreversed
Detects support for the `reversed` attribute on the `<ol>` element.
MathML	mathml
Detects support for MathML, for mathematic equations in web pages.
Message Channel	MessageChannel
Detects support for Message Channels, a way to communicate between different browsing contexts like iframes, workers, etc..
Notification	notification
Detects support for the Notifications API
Page Visibility API	pagevisibility
Detects support for the Page Visibility API, which can be used to disable unnecessary actions and otherwise improve user experience.
Navigation Timing API	performance
Detects support for the Navigation Timing API, for measuring browser and connection performance.
DOM Pointer Events API	pointerevents
Detects support for the DOM Pointer Events API, which provides a unified event interface for pointing input devices, as implemented in IE10+, Edge and Blink.
Pointer Lock API	pointerlock
Detects support the pointer lock API which allows you to lock the mouse cursor to the browser window.
postMessage	postmessage
Detects support for the `window.postMessage` protocol for cross-document messaging.
Proximity API	proximity
Detects support for an API that allows users to get proximity related information from the device's proximity sensor.
QuerySelector	queryselector
Detects support for querySelector.
Quota Storage Management API	quotamanagement
Detects the ability to request a specific amount of space for filesystem access
requestAnimationFrame	requestanimationframe
Detects support for the `window.requestAnimationFrame` API, for offloading animation repainting to the browser for optimized performance.
ServiceWorker API	serviceworker
ServiceWorkers (formerly Navigation Controllers) are a way to persistently cache resources to built apps that work better offline.
SVG	svg
Detects support for SVG in `<embed>` or `<object>` elements.
Template strings	templatestrings
Template strings are string literals allowing embedded expressions.
Touch Events	touchevents
Indicates if the browser supports the W3C Touch Events API. This does not necessarily reflect a touchscreen device: Older touchscreen devices only emulate mouse events Modern IE touch devices implement the Pointer Events API instead: use `Modernizr.pointerevents` to detect support for that Some browsers & OS setups may enable touch APIs when no touchscreen is connected Future browsers may implement other event models for touch interactions See this article: You Can't Detect A Touchscreen. It's recommended to bind both mouse and touch/pointer events simultaneously – see this HTML5 Rocks tutorial. This test will also return `true` for Firefox 4 Multitouch support.
Typed arrays	typedarrays
Detects support for native binary data manipulation via Typed Arrays in JavaScript. Does not check for DataView support; use `Modernizr.dataview` for that.
Unicode Range	unicoderange
Unicode characters	unicode
Detects if unicode characters are supported in the current document.
IE User Data API	userdata
Detects support for IE userData for persisting data, an API similar to localStorage but supported since IE5.
Vibration API	vibrate
Detects support for the API that provides access to the vibration mechanism of the hosting device, to provide tactile feedback.
HTML5 Video	video
Detects support for the video element, as well as testing what types of content it supports. Subproperties are provided to describe support for `ogg`, `h264` and `webm` formats, e.g.: `Modernizr.video // true Modernizr.video.ogg // 'probably'`
VML	vml
Detects support for VML.
Web Intents	webintents
Detects native support for the Web Intents APIs for service discovery and inter-application communication. Chrome added support for this in v19, but removed it again in v24 because of "a number of areas for development in both the API and specific user experience in Chrome". No other browsers currently support it, however a JavaScript shim is available.
Web Animation API	animation
Detects support for the Web Animation API, a way to create css animations in js
WebGL	webgl
WebSockets Support	websockets
XDomainRequest	xdomainrequest
Detects support for XDomainRequest in IE9 & IE8
a[download] Attribute	adownload
When used on an `<a>`, this attribute signifies that the resource it points to should be downloaded by the browser rather than navigating to it.
Audio Loop Attribute	audioloop
Detects if an audio element can automatically restart, once it has finished
Audio Preload	audiopreload
Detects if audio can be downloaded in the background before it starts playing in the `<audio>` element
Web Audio API	webaudio
Detects the older non standard webaudio API, (as opposed to the standards based AudioContext API)
Low Battery Level	lowbattery
Enable a developer to remove CPU intensive CSS/JS when battery is low
canvas blending support	canvasblending
Detects if Photoshop style blending modes are available in canvas.
canvas.toDataURL type support	todataurljpeg,todataurlpng,todataurlwebp
canvas winding support	canvaswinding
Determines if winding rules, which controls if a path can go clockwise or counterclockwise
getRandomValues	getrandomvalues
Detects support for the window.crypto.getRandomValues method for generating cryptographically secure random numbers
cssall	cssall
Detects support for the `all` css property, which is a shorthand to reset all css properties (except direction and unicode-bidi) to their original value
CSS Animations	cssanimations
Detects whether or not elements can be animated using CSS
Appearance	appearance
Detects support for the `appearance` css property, which is used to make an element inherit the style of a standard user interface element. It can also be used to remove the default styles of an element, such as input and buttons.
Backdrop Filter	backdropfilter
Detects support for CSS Backdrop Filters, allowing for background blur effects like those introduced in iOS 7. Support for this was added to iOS Safari/WebKit in iOS 9.
CSS Background Blend Mode	backgroundblendmode
Detects the ability for the browser to composite backgrounds using blending modes similar to ones found in Photoshop or Illustrator.
CSS Background Clip Text	backgroundcliptext
Detects the ability to control specifies whether or not an element's background extends beyond its border in CSS
Background Position Shorthand	bgpositionshorthand
Detects if you can use the shorthand method to define multiple parts of an element's background-position simultaniously. eg `background-position: right 10px bottom 10px`
Background Position XY	bgpositionxy
Detects the ability to control an element's background position using css
Background Repeat	bgrepeatspace,bgrepeatround
Detects the ability to use round and space as properties for background-repeat
Background Size	backgroundsize
Background Size Cover	bgsizecover
Border Image	borderimage
Border Radius	borderradius
Box Shadow	boxshadow
Box Sizing	boxsizing
CSS Calc	csscalc
Method of allowing calculated values for length units. For example: `//lem { width: calc(100% - 3em); }`
CSS :checked pseudo-selector	checked
CSS Font ch Units	csschunit
CSS Columns	csscolumns
CSS Grid (old & new)	cssgrid,cssgridlegacy
CSS Cubic Bezier Range	cubicbezierrange
CSS Display run-in	display-runin
CSS Display table	displaytable
`display: table` and `table-cell` test. (both are tested under one name `table-cell` )
CSS text-overflow ellipsis	ellipsis
CSS.escape()	cssescape
Tests for `CSS.escape()` support.
CSS Font ex Units	cssexunit
CSS Filters	cssfilters
Flexbox	flexbox
Detects support for the Flexible Box Layout model, a.k.a. Flexbox, which allows easy manipulation of layout order and sizing within a container.
Flexbox (legacy)	flexboxlegacy
Flexbox (tweener)	flexboxtweener
Flex Line Wrapping	flexwrap
Detects support for the `flex-wrap` CSS property, part of Flexbox, which isn’t present in all Flexbox implementations (notably Firefox). This featured in both the 'tweener' syntax (implemented by IE10) and the 'modern' syntax (implemented by others). This detect will return `true` for either of these implementations, as long as the `flex-wrap` property is supported. So to ensure the modern syntax is supported, use together with `Modernizr.flexbox`: if (Modernizr.flexbox && Modernizr.flexwrap) { // Modern Flexbox with `flex-wrap` supported } else { // Either old Flexbox syntax, or `flex-wrap` not supported }
CSS :focus-within pseudo-selector	focuswithin
@font-face	fontface
CSS Generated Content	generatedcontent
CSS Gradients	cssgradients
CSS Hairline	hairline
Detects support for hidpi/retina hairlines, which are CSS borders with less than 1px in width, for being physically 1px on hidpi screens.
CSS HSLA Colors	hsla
CSS Hyphens	csshyphens,softhyphens,softhyphensfind
CSS :invalid pseudo-class	cssinvalid
Detects support for the ':invalid' CSS pseudo-class.
CSS :last-child pseudo-selector	lastchild
CSS Mask	cssmask
CSS Media Queries	mediaqueries
CSS Multiple Backgrounds	multiplebgs
CSS :nth-child pseudo-selector	nthchild
Detects support for the ':nth-child()' CSS pseudo-selector.
CSS Object Fit	objectfit
CSS Opacity	opacity
CSS Overflow Scrolling	overflowscrolling
CSS Pointer Events	csspointerevents
CSS position: sticky	csspositionsticky
CSS Generated Content Animations	csspseudoanimations
CSS Generated Content Transitions	csspseudotransitions
CSS Reflections	cssreflections
CSS Regions	regions
CSS Font rem Units	cssremunit
CSS UI Resize	cssresize
Test for CSS 3 UI "resize" property
CSS rgba	rgba
CSS Stylable Scrollbars	cssscrollbar
Scroll Snap Points	scrollsnappoints
Detects support for CSS Snap Points
CSS Shapes	shapes
CSS general sibling selector	siblinggeneral
CSS Subpixel Fonts	subpixelfont
CSS Supports	supports
CSS :target pseudo-class	target
Detects support for the ':target' CSS pseudo-class.
CSS text-align-last	textalignlast
CSS textshadow	textshadow
CSS Transforms	csstransforms
CSS Transforms 3D	csstransforms3d
CSS Transforms Level 2	csstransformslevel2
CSS Transform Style preserve-3d	preserve3d
Detects support for `transform-style: preserve-3d`, for getting a proper 3D perspective on elements.
CSS Transitions	csstransitions
CSS user-select	userselect
CSS :valid pseudo-class	cssvalid
Detects support for the ':valid' CSS pseudo-class.
Variable Open Type Fonts	variablefonts
CSS vh unit	cssvhunit
CSS vmax unit	cssvmaxunit
CSS vmin unit	cssvminunit
CSS vw unit	cssvwunit
will-change	willchange
Detects support for the `will-change` css property, which formally signals to the browser that an element will be animating.
CSS wrap-flow	wrapflow
classList	classlist
createElement with Attributes	createelementattrs,createelement-attrs
dataset API	dataset
Document Fragment	documentfragment
Append multiple elements to the DOM within a single insertion.
[hidden] Attribute	hidden
Does the browser support the HTML5 [hidden] attribute?
microdata	microdata
DOM4 MutationObserver	mutationobserver
Determines if DOM4 MutationObserver support is available.
Passive event listeners	passiveeventlisteners
Detects support for the passive option to addEventListener.
bdi Element	bdi
Detect support for the bdi element, a way to have text that is isolated from its possibly bidirectional surroundings
datalist Element	datalistelem
details Element	details
output Element	outputelem
picture Element	picture
progress Element	progressbar,meter
ruby, rp, rt Elements	ruby
Template Tag	template
time Element	time
Track element and Timed Text Track	texttrackapi,track
Unknown Elements	unknownelements
Does the browser support HTML with non-standard / new elements?
ES5 Array	es5array
Check if browser implements ECMAScript 5 Array per specification.
ES5 Date	es5date
Check if browser implements ECMAScript 5 Date per specification.
ES5 Function	es5function
Check if browser implements ECMAScript 5 Function per specification.
ES5 Object	es5object
Check if browser implements ECMAScript 5 Object per specification.
ES5	es5
Check if browser implements everything as specified in ECMAScript 5.
ES5 Strict Mode	strictmode
Check if browser implements ECMAScript 5 Object strict mode.
ES5 String	es5string
Check if browser implements ECMAScript 5 String per specification.
ES5 Syntax	es5syntax
Check if browser accepts ECMAScript 5 syntax.
ES5 Immutable Undefined	es5undefined
Check if browser prevents assignment to global `undefined` per ECMAScript 5.
ES6 Array	es6array
Check if browser implements ECMAScript 6 Array per specification.
ES6 Arrow Functions	arrow
Check if browser implements ECMAScript 6 Arrow Functions per specification.
ES6 Collections	es6collections
Check if browser implements ECMAScript 6 Map, Set, WeakMap and WeakSet
ES5 String.prototype.contains	contains
Check if browser implements ECMAScript 6 `String.prototype.contains` per specification.
ES6 Generators	generators
Check if browser implements ECMAScript 6 Generators per specification.
ES6 Math	es6math
Check if browser implements ECMAScript 6 Math per specification.
ES6 Number	es6number
Check if browser implements ECMAScript 6 Number per specification.
ES6 Object	es6object
Check if browser implements ECMAScript 6 Object per specification.
ES6 Promises	promises
Check if browser implements ECMAScript 6 Promises per specification.
ES6 String	es6string
Check if browser implements ECMAScript 6 String per specification.
Orientation and Motion Events	devicemotion,deviceorientation
Part of Device Access aspect of HTML5, same category as geolocation. `devicemotion` tests for Device Motion Event support, returns boolean value true/false. `deviceorientation` tests for Device Orientation Event support, returns boolean value true/false
onInput Event	oninput
`oninput` tests if the browser is able to detect the input event
File API	filereader
`filereader` tests for the File API specification Tests for objects specific to the File API W3C specification without being redundant (don't bother testing for Blob since it is assumed to be the File object's prototype.)
Filesystem API	filesystem
input[capture] Attribute	capture
When used on an `<input>`, this attribute signifies that the resource it takes should be generated via device's camera, camcorder, sound recorder.
input[file] Attribute	fileinput
Detects whether input type="file" is available on the platform E.g. iOS < 6 and some android version don't support this
input[directory] Attribute	directory
When used on an `<input type="file">`, the `directory` attribute instructs the user agent to present a directory selection dialog instead of the usual file selection dialog.
input[form] Attribute	formattribute
Detects whether input form="form_id" is available on the platform E.g. IE 10 (and below), don't support this
input[type="number"] Localization	localizednumber
Detects whether input type="number" is capable of receiving and displaying localized numbers, e.g. with comma separator.
placeholder attribute	placeholder
Tests for placeholder attribute in inputs and textareas
form#requestAutocomplete()	requestautocomplete
When used with input[autocomplete] to annotate a form, form.requestAutocomplete() shows a dialog in Chrome that speeds up checkout flows (payments specific for now).
Form Validation	formvalidation
This implementation only tests support for interactive form validation. To check validation for a specific type or a specific other constraint, the test can be combined: `Modernizr.inputtypes.number && Modernizr.formvalidation` (browser supports rangeOverflow, typeMismatch etc. for type=number) `Modernizr.input.required && Modernizr.formvalidation` (browser supports valueMissing)
iframe[sandbox] Attribute	sandbox
Test for `sandbox` attribute in iframes.
iframe[seamless] Attribute	seamless
Test for `seamless` attribute in iframes.
iframe[srcdoc] Attribute	srcdoc
Test for `srcdoc` attribute in iframes.
Animated PNG	apng
Test for animated png support.
Image crossOrigin	imgcrossorigin
Detects support for the crossOrigin attribute on images, which allow for cross domain images inside of a canvas without tainting it
JPEG 2000	jpeg2000
Test for JPEG 2000 support
JPEG XR (extended range)	jpegxr
Test for JPEG XR support
sizes attribute	sizes
Test for the `sizes` attribute on images
srcset attribute	srcset
Test for the srcset attribute of images
Webp Alpha	webpalpha
Tests for transparent webp support.
Webp Animation	webpanimation
Tests for animated webp support.
Webp Lossless	webplossless,webp-lossless
Tests for non-alpha lossless webp support.
Webp	webp
Tests for lossy, non-alpha webp support. Tests for all forms of webp support (lossless, lossy, alpha, and animated).. Modernizr.webp // Basic support (lossy) Modernizr.webp.lossless // Lossless Modernizr.webp.alpha // Alpha (both lossy and lossless) Modernizr.webp.animation // Animated WebP
input formaction	inputformaction
Detect support for the formaction attribute on form inputs
input formenctype	inputformenctype
Detect support for the formenctype attribute on form inputs, which overrides the form enctype attribute
input formmethod	inputformmethod
Detect support for the formmethod attribute on form inputs
input formtarget	inputformtarget
Detect support for the formtarget attribute on form inputs, which overrides the form target attribute
Hover Media Query	hovermq
Detect support for Hover based media queries
Pointer Media Query	pointermq
Detect support for Pointer based media queries
Beacon API	beacon
Detects support for an API that allows for asynchronous transfer of small HTTP data from the client to a server.
Low Bandwidth Connection	lowbandwidth
Tests for determining low-bandwidth via `navigator.connection` There are two iterations of the `navigator.connection` interface. The first is present in Android 2.2+ and only in the Browser (not WebView) http://docs.phonegap.com/en/1.2.0/phonegap_connection_connection.md.html#connection.type http://davidbcalhoun.com/2010/using-navigator-connection-android The second is specced at http://dev.w3.org/2009/dap/netinfo/ and perhaps landing in WebKit https://bugs.webkit.org/show_bug.cgi?id=73528 Unknown devices are assumed as fast For more rigorous network testing, consider boomerang.js: https://github.com/bluesmoon/boomerang/
Server Sent Events	eventsource
Tests for server sent events aka eventsource.
Fetch API	fetch
Detects support for the fetch API, a modern replacement for XMLHttpRequest.
XHR responseType='arraybuffer'	xhrresponsetypearraybuffer
Tests for XMLHttpRequest xhr.responseType='arraybuffer'.
XHR responseType='blob'	xhrresponsetypeblob
Tests for XMLHttpRequest xhr.responseType='blob'.
XHR responseType='document'	xhrresponsetypedocument
Tests for XMLHttpRequest xhr.responseType='document'.
XHR responseType='json'	xhrresponsetypejson
Tests for XMLHttpRequest xhr.responseType='json'.
XHR responseType='text'	xhrresponsetypetext
Tests for XMLHttpRequest xhr.responseType='text'.
XHR responseType	xhrresponsetype
Tests for XMLHttpRequest xhr.responseType.
XML HTTP Request Level 2 XHR2	xhr2
Tests for XHR2.
script[async]	scriptasync
Detects support for the `async` attribute on the `<script>` element.
script[defer]	scriptdefer
Detects support for the `defer` attribute on the `<script>` element.
Speech Recognition API	speechrecognition
Speech Synthesis API	speechsynthesis
Local Storage	localstorage
Session Storage	sessionstorage
Web SQL Database	websqldatabase
style[scoped]	stylescoped
Support for the `scoped` attribute of the `<style>` element.
SVG as an <img> tag source	svgasimg
SVG clip paths	svgclippaths
Detects support for clip paths in SVG (only, not on HTML content). See this discussion regarding applying SVG clip paths to HTML content.
SVG filters	svgfilters
SVG foreignObject	svgforeignobject
Detects support for foreignObject tag in SVG.
Inline SVG	inlinesvg
Detects support for inline SVG in HTML (not within XHTML).
SVG SMIL animation	smil
textarea maxlength	textareamaxlength
Detect support for the maxlength attribute of a textarea element
Blob URLs	bloburls
Detects support for creating Blob URLs
Data URI	datauri
Detects support for data URIs. Provides a subproperty to report support for data URIs over 32kb in size: `Modernizr.datauri // true Modernizr.datauri.over32kb // false in IE8`
URL parser	urlparser
Check if browser implements the URL constructor for parsing URLs.
URLSearchParams API	urlsearchparams
Detects support for an API that provides utility methods for working with the query string of a URL.
Video Autoplay	videoautoplay
Checks for support of the autoplay attribute of the video element.
Video crossOrigin	videocrossorigin
Detects support for the crossOrigin attribute on video tag
Video Loop Attribute	videoloop
Video Preload Attribute	videopreload
WebGL Extensions	webglextensions
Detects support for OpenGL extensions in WebGL. It's `true` if the WebGL extensions API is supported, then exposes the supported extensions as subproperties, e.g.: `if (Modernizr.webglextensions) { // WebGL extensions API supported } if ('OES_vertex_array_object' in Modernizr.webglextensions) { // Vertex Array Objects extension supported }`
RTC Data Channel	datachannel
Detect for the RTCDataChannel API that allows for transfer data directly from one peer to another
getUserMedia	getusermedia
Detects support for the new Promise-based `getUserMedia` API.
RTC Peer Connection	peerconnection
Binary WebSockets	websocketsbinary
Base 64 encoding/decoding	atobbtoa
Detects support for WindowBase64 API (window.atob && window.btoa).
Framed window	framed
Tests if page is iframed.
matchMedia	matchmedia
Detects support for matchMedia.
Workers from Blob URIs	blobworkers
Detects support for creating Web Workers from Blob URIs.
Workers from Data URIs	dataworkers
Detects support for creating Web Workers from Data URIs.
Shared Workers	sharedworkers
Detects support for the `SharedWorker` API from the Web Workers spec.
Transferables Objects	transferables
Detects whether web workers can use `transferables` objects.
Web Workers	webworkers
Detects support for the basic `Worker` API from the Web Workers spec. Web Workers provide a simple means for web content to run scripts in background threads.