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.
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.
FLAC audio format
Popular lossless audio compression format
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`
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.
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.
MP3 audio format
Popular lossy audio compression format
MPEG-4/H.264 video format
Commonly used video compression format.
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.
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.
audiodata api: format
document api: forms
formdataevent api: formdata
formdata api: @@iterator
formdata api: append
formdata api: append: `filename` parameter
formdata api: delete
formdata api: entries
formdata api: foreach
formdata api: get
formdata api: getall
formdata api: has
formdata api: keys
formdata api: set
formdata api: values
formdata api: available in workers
request api: formdata
response api: formdata
html element: form
html element: form: action
html element: form: method
html element: form: name
html element: form: rel
flif / fuif / pik image formats