classList (DOMTokenList)
Method of easily manipulating classes on elements, using the `DOMTokenList` object.
Crisp edges/pixelated images
Scales images with an algorithm that preserves edges and contrast, without smoothing colors or introducing blur. This is intended for images such as pixel art. Official values that accomplish this for the `image-rendering` property are `crisp-edges` and `pixelated`.
:is() CSS pseudo-class
The `:is()` (formerly `:matches()`, formerly `:any()`) pseudo-class checks whether the element at its position in the outer selector matches any of the selectors in its selector list. It's useful syntactic sugar that allows you to avoid writing out all the combinations manually as separate selectors. The effect is similar to nesting in Sass and most other CSS preprocessors.
Datalist element
Method of setting a list of options for a user to select in a text field, while leaving the ability to enter a custom value.
CSS Flexible Box Layout Module
Method of positioning elements in horizontal or vertical stacks. Support includes all properties prefixed with `flex`, as well as `display: flex`, `display: inline-flex`, `align-content`, `align-items`, `align-self`, `justify-content` and `order`.
HEIF/ISO Base Media File Format
HEIF (High Efficiency Image File Format) is a standard developed by the Moving Picture Experts Group (MPEG) for storage and sharing of images and image sequences. Can use `.heif` or `.heic` file extensions.
Page Visibility
JavaScript API for determining whether a document is visible on the display
Permissions API
High-level JavaScript API for checking and requesting permissions
Permissions Policy
A security mechanism that allows developers to explicitly enable or disable various powerful browser features for a given site. Similar to [Document Policy](/document-policy).
Promise.prototype.finally
When the promise is settled, whether fulfilled or rejected, the specified callback function is executed.
Promises
A promise represents the eventual result of an asynchronous operation.
credential api: isconditionalmediationavailable
event api: istrusted
external api: issearchproviderinstalled
fetchevent api: isreload
htmlelement api: iscontenteditable
idbindex api: isautolocale
inputevent api: iscomposing
issecurecontext api
issecurecontext api: available in workers
mediasource api: istypesupported
node api: isconnected
node api: isdefaultnamespace
node api: isequalnode
node api: issamenode
range api: ispointinrange
scheduling api: isinputpending
screen api: isextended
selection api: iscollapsed
usbdevice api: isochronoustransferin
usbdevice api: isochronoustransferout
xrview api: isfirstpersonobserver
css property: isolation
javascript built-in: arraybuffer: isview
javascript built-in: array: isarray
javascript built-in: atomics: islockfree
javascript built-in: isfinite
javascript built-in: isnan
javascript built-in: number: isfinite
javascript built-in: number: isinteger
javascript built-in: number: isnan
javascript built-in: number: issafeinteger
javascript built-in: object: is
javascript built-in: object: isextensible
javascript built-in: object: isfrozen
javascript built-in: object: isprototypeof
javascript built-in: object: issealed
javascript built-in: proxy: handler: isextensible
javascript built-in: reflect: isextensible
javascript built-in: symbol: isconcatspreadable
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