Caniuse.com is a web site and web browser test suite maintained by Alexis Deveria . It provides accurate information concerning the features supported by popular web browsers. It is used as a data source for some web browser properties in 51Degrees including those contained in the following table.

51Degrees Property	Caniuse.com Feature Test	Specification
CssTransitions	css-transitions	W3C
AnimationTiming	requestanimationframe	W3C
BlobBuilder	blobbuilder	W3C
CssBackground	multibackgrounds	W3C
	css-boxshadow	W3C
	border-radius	W3C
CssBorderImage	cssborderimage	W3C
CssCanvas	css-canvas	W3C
CssColor	css3-colors	W3C
CssColumn	multicolumn	W3C
CssFlexbox	flexbox	W3C
CssFont	fontface	W3C
	css-gradients	W3C
	css-repeating-gradients	W3C
	object-fit	W3C
	css-image-orientation	W3C
CssMediaQueries	css-mediaqueries	W3C
CssMinMax	minmaxwh	W3C
CssPosition	css-fixed	W3C
CssText	css-textshadow	W3C
	wordwrap	W3C
	word-break	W3C
CssTransforms	transforms2d	W3C
CssUI	text-overflow	W3C
	css3-boxsizing	W3C
	pointer	W3C
DataUrl	datauri	ietf.org
DeviceOrientation	deviceorientation	W3C
FileReader	filereader	W3C
FormData	xhr2	W3C
Fullscreen	fullscreen	W3C
GeoLocation	geolocation	W3C
History	history	whatwg.org
Html5	html5semantic	whatwg.org
	details	whatwg.org
	audio	whatwg.org
	video	whatwg.org
	progressmeter	whatwg.org
Iframe	iframe-sandbox;	whatwg.org
IndexedDB	indexeddb	W3C
Json	json	ecmascript.org
PostMessage	channel-messaging	W3C
Selector	matchesselector	W3C
Svg	svg	W3C
TouchEvents	touch	W3C
Video	video	whatwg.org
WebWorkers	webworkers	W3C
Xhr2	xhr2	W3C
Masking	css-masks	W3C
Canvas	canvas	whatwg.org

Notes

Where a property in 51Degrees requires more than 1 caniuse.com feature test to pass all the tests are shown.

The 51Degrees property primary BrowserPropertySource should be checked for the value "Caniuse.com" to determine if the browser property information matched caniuse.com

The following table shows how caniuse.com feature test results for a given browser are mapped to 51Degrees property values.

Caniuse.com Feature Test Result	Related 51Degrees Property Value
Supported by default	True
Requires prefix to work	True
Almost supported (aka Partial support)	False
No support, or disabled by default	False
No support, but has (P)olyfill	False
Almost supported but requires prefix work	False
Support unknown	Unknown
Disabled by default (need to enable)	Unknown

At present caniuse.com does not provide information on the following 51Degrees properties.

• CSSOverflow
• FileSaver
• FileWriter
• ViewPort
• Progress
• Html-Media-Capture
• Track