AAC audio file format

Advanced Audio Coding format, designed to be the successor format to MP3, with generally better sound quality.

AV1 video format

AV1 (AOMedia Video 1) is a royalty-free video format by the Alliance for Open Media, meant to succeed its predecessor VP9 and compete with the [HEVC/H.265](/hevc) format.

AVIF image format

A modern image format based on the [AV1 video format](/av1). AVIF generally has better compression than [WebP](/webp), JPEG, PNG and GIF and is designed to supersede them. AVIF competes with [JPEG XL](/jpegxl) which has similar compression quality and is generally seen as more feature-rich than AVIF.

Text API for Canvas

Method of displaying text on Canvas elements

ChaCha20-Poly1305 cipher suites for TLS

A set of cipher suites used in Transport Layer Security (TLS) protocol, using ChaCha20 for symmetric encryption and Poly1305 for authentication.

COLR/CPAL(v0) Font Formats

The COLR table adds support for multi-colored glyphs in a manner that integrates with the rasterizers of existing text engines. COLRv0 only supports pure colors, does not support gradients, transformations and various blending modes.

COLR/CPAL(v1) Font Formats

COLRv1 is an improved version of COLRv0, this is also part of the OpenType specification. COLRv1 supports additional graphic capabilities. In addition to solid colors, gradient fills can be used, as well as more complex fills using other graphic operations, including affine transformations and various blending modes.

CSS Generated content for pseudo-elements

Method of displaying text or images before or after the given element's contents using the ::before and ::after pseudo-elements. All browsers with support also support the `attr()` notation in the `content` property.

CSS3 attr() function for all properties

While `attr()` is supported for effectively all browsers for the `content` property, CSS Values and Units Level 5 adds the ability to use `attr()` on **any** CSS property, and to use it for non-string values (e.g. numbers, colors).

FLAC audio format

Popular lossless audio compression format

gap property for Flexbox

`gap` for flexbox containers to create gaps/gutters between flex items

system-ui value for font-family

Value for `font-family` that represents the default user interface font.

Form attribute

Attribute for associating input and submit buttons with a form.

Attributes for form submission

Attributes for form submission that may be specified on submit buttons. The attributes are: `formaction`, `formenctype`, `formmethod`, `formnovalidate`, and `formtarget`

Form validation

Method of setting required fields and field types without requiring JavaScript. This includes preventing forms from being submitted when appropriate, the `checkValidity()` method as well as support for the `:invalid`, `:valid`, and `:required` CSS pseudo-classes.

HEIF/HEIC image format

A modern image format based on the [HEVC video format](/hevc). HEIC generally has better compression than [WebP](/webp), JPEG, PNG and GIF. It is hard for browsers to support HEIC because it is [complex and expensive to license](https://en.wikipedia.org/wiki/High_Efficiency_Video_Coding#Patent_licensing). [AVIF](/avif) and [JPEG XL](/jpegxl) provide free licenses and are designed to supersede HEIC.

HEVC/H.265 video format

The High Efficiency Video Coding (HEVC) compression standard is a video compression format intended to succeed H.264. It is hard for browsers to universally support HEVC because it is [complex and expensive to license](https://en.wikipedia.org/wiki/High_Efficiency_Video_Coding#Patent_licensing). HEVC competes with [AV1](/av1) which has similar compression quality and provides a free license.

sandbox attribute for iframes

Method of running external site pages with reduced privileges (e.g. no JavaScript) in iframes.

seamless attribute for iframes

The seamless attribute makes an iframe's contents actually part of a page, and adopts the styles from its hosting page. The attribute has been removed from both [the WHATWG](https://github.com/whatwg/html/issues/331) and [the W3C](https://github.com/w3c/html/pull/325) HTML5 specifications.

srcdoc attribute for iframes

Override the content specified in the `src` attribute (if present) with HTML content within the attribute.

accept attribute for file input

Allows a filter to be defined for what type of files a user may pick with from an `<input type="file">` dialog

Pattern attribute for input fields

Allows validation of an input field based on a given regular expression pattern.

Selection controls for input & textarea

Controls for setting and getting text selection via `setSelectionRange()` and the `selectionStart` & `selectionEnd` properties.

JPEG 2000 image format

JPEG 2000 was built to supersede the original JPEG format by having better compression and more features. [WebP](/webp), [AVIF](/avif) and [JPEG XL](/jpegxl) are all designed to supersede JPEG 2000.

JPEG XL image format

A modern image format optimized for web environments. JPEG XL generally has better compression than [WebP](/webp), JPEG, PNG and GIF and is designed to supersede them. JPEG XL competes with [AVIF](/avif) which has similar compression quality but fewer features overall.

JPEG XR image format

JPEG XR was built to supersede the original JPEG format by having better compression and more features. [WebP](/webp), [AVIF](/avif) and [JPEG XL](/jpegxl) are all designed to supersede JPEG XR.

maxlength attribute for input and textarea elements

Declares an upper bound on the number of characters the user can input. Normally the UI ignores attempts by the user to type in additional characters beyond this limit.

MP3 audio format

Popular lossy audio compression format

MPEG-4/H.264 video format

Commonly used video compression format.

Object RTC (ORTC) API for WebRTC

Enables mobile endpoints to talk to servers and web browsers with Real-Time Communications (RTC) capabilities via native and simple JavaScript APIs

Ogg Vorbis audio format

Vorbis is a free and open source audio format, most commonly used with the Ogg container.

Ogg/Theora video format

Free lossy video compression format.

Opus audio format

Royalty-free open audio codec by IETF, which incorporated SILK from Skype and CELT from Xiph.org, to serve higher sound quality and lower latency at the same bitrate.

async attribute for external scripts

The boolean async attribute on script elements allows the external JavaScript file to run when it's available, without delaying page load first.

defer attribute for external scripts

The boolean defer attribute on script elements allows the external JavaScript file to run when the DOM is loaded, without delaying page load first.

SVG effects for HTML

Method of using SVG transforms, filters, etc on HTML elements using either CSS or the foreignObject element

Trusted Types for DOM manipulation

An API that forces developers to be very explicit about their use of powerful DOM-injection APIs. Can greatly improve security against XSS attacks.

Wav audio format

Waveform Audio File Format, aka WAV or WAVE, a typically uncompressed audio format.

WebM video format

Multimedia format designed to provide a royalty-free, high-quality open video compression format for use with HTML5 video. WebM supports the video codec VP8 and VP9.

WebP image format

Image format (based on the VP8 video format) that supports lossy and lossless compression, as well as animation and alpha transparency. WebP generally has better compression than JPEG, PNG and GIF and is designed to supersede them. [AVIF](/avif) and [JPEG XL](/jpegxl) are designed to supersede WebP.

WOFF - Web Open Font Format

Compressed TrueType/OpenType font that contains information about the font's source.

WOFF 2.0 - Web Open Font Format

TrueType/OpenType font that provides better compression than WOFF 1.0.

formdata api

formdata api: get

opera for android

google chrome for android

mozilla firefox for android

uc browser for android

qq browser for android

baidu browser for android