Base64 encoding and decoding

Utility functions for encoding and decoding strings to and from base 64: window.atob() and window.btoa().

CSS background-attachment

Method of defining how a background image is attached to a scrollable element. Values include `scroll` (default), `fixed` and `local`.

Background-clip: text

Clipping a background image to the foreground text.

CSS3 Background-image options

New properties to affect background images, including background-clip, background-origin and background-size

background-position-x & background-position-y

CSS longhand properties to define x or y positions separately.

CSS background-repeat round and space

Allows CSS background images to be repeated without clipping.

Background Sync API

Provides one-off and periodic synchronization for Service Workers with an onsync event.

Battery Status API

Method to provide information about the battery status of the hosting device.

Beacon API

Allows data to be sent asynchronously to a server with `navigator.sendBeacon`, even after a page was closed. Useful for posting analytics data the moment a user was finished using the page.

BigInt

Arbitrary-precision integers in JavaScript.

CSS3 Border images

Method of using images for borders

CSS3 Border-radius (rounded corners)

Method of making the border corners round. Covers support for the shorthand `border-radius` as well as the long-hand properties (e.g. `border-top-left-radius`)

BroadcastChannel

BroadcastChannel allows scripts from the same origin but other browsing contexts (windows, workers) to send each other messages.

Brotli Accept-Encoding/Content-Encoding

More effective lossless compression algorithm than gzip and deflate.

Canvas blend modes

Method of defining the effect resulting from overlaying two layers on a Canvas element.

Basic console logging functions

Method of outputting data to the browser's console, intended for development purposes.

CSS Backdrop Filter

Method of applying filter effects (like blur, grayscale or hue) to content/elements below the target element.

CSS background-position edge offsets

Allows CSS background images to be positioned relative to the specified edge using the 3 to 4 value syntax. For example: `background-position: right 5px bottom 5px;` for positioning 5px from the bottom-right corner.

CSS background-blend-mode

Allows blending between CSS background images, gradients, and colors.

CSS box-decoration-break

Controls whether the box's margins, borders, padding, and other decorations wrap the broken edges of the box fragments (when the box is split by a break (page/column/region/line).

CSS3 Box-shadow

Method of displaying an inner or outer shadow effect to elements

CSS Filter Effects

Method of applying filter effects using the `filter` property to elements, matching filters available in SVG. Filter functions include blur, brightness, contrast, drop-shadow, grayscale, hue-rotate, invert, opacity, sepia and saturate.

Blending of HTML/SVG elements

Allows blending between arbitrary SVG and HTML elements

CSS overscroll-behavior

CSS property to control the behavior when the scroll position of a scroll container reaches the edge of the scrollport.

CSS page-break properties

Properties to control the way elements are broken across (printed) pages.

CSS Scroll-behavior

Method of specifying the scrolling behavior for a scrolling box, when scrolling happens due to navigation or CSSOM scrolling APIs.

CSS Subgrid

Feature of the CSS Grid Layout Module Level 2 that allows a grid-item with its own grid to align in one or both dimensions with its parent grid.

CSS text-wrap: balance

Allows multiple lines of text to have their lines broken in such a way that each line is roughly the same width, often used to make headlines more readable and visually appealing.

CSS3 Box-sizing

Method of specifying whether or not an element's borders and padding should be included in size units

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`.

Element.getBoundingClientRect()

Method to get the size and position of an element's bounding box, relative to the viewport.

getElementsByClassName

Method of accessing DOM elements by class name

CSS inline-block

Method of displaying an element as a block while flowing it with text.

IntersectionObserver V2

Iteration on the original API that also reports if the element is covered by another element or has filters applied to it. Useful for blocking clickjacking attempts or tracking ad exposure.

CSS3 Multiple backgrounds

Method of using multiple images as a background

Built-in PDF viewer

Support for a PDF viewer that is part of the browser, rather than requiring a PDF file to be opened in an external application.

Shared Array Buffer

Type of ArrayBuffer that can be shared across Workers.

SVG (basic support)

Method of displaying basic Vector Graphics features using the embed or object elements. Refers to the SVG 1.1 spec.

SVG in CSS backgrounds

Method of using SVG images as CSS backgrounds

Variable fonts

OpenType font settings that allows a single font file to behave like multiple fonts: it can contain all the allowed variations in width, weight, slant, optical size, or any other exposed axes of variation as defined by the font designer. Variations can be applied via the `font-variation-settings` property.

wbr (word break opportunity) element

Represents an extra place where a line of text may optionally be broken.

Web Animations API

Lets you create animations that are run in the browser, as well as inspect and manipulate animations created through declarative means like CSS.

CSS3 word-break

Property to prevent or allow words to be broken over multiple lines between letters.

html element: b

background-filter

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