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 format.
AVIF image format
A modern image format based on the AV1 video format. 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.
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`
HTML5 form features
Expanded form options, including things like date pickers, sliders, validation, placeholders and multiple file uploads. Previously known as "Web forms 2.0".
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.
HEVC/H.265 video format
The High Efficiency Video Coding (HEVC) compression standard is a video compression format intended to succeed H.264
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.
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.
body api: formdata
document api: forms
formdataevent api: formdata
formdata api: @@iterator
formdata api: append
formdata api: append: `append` with filename
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
html element: form
html element: form: accept
html element: form: accept-charset
html element: form: action
html element: form: autocomplete
html element: form: enctype
html element: form: method
html element: form: name
html element: form: novalidate
html element: form: target