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HTML & Media
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CSS
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nesting
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backdrop-filter
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mask
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mask-composite
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-webkit-mask-composite
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mask-mode
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mask-border
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print-color-adjust
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user-select
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text-size-adjust
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box-decoration-break
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background-clip: text
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-webkit-text-fill-color
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-webkit-text-stroke
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paint-order for -webkit-text-stroke
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hyphens
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hyphenate-character
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cross-fade()
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line-clamp
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element()
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-webkit-box-reflect
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{inline, block}-size: stretch
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initial-letter
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text-decoration (shorthand)
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margin-trim
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:host-context()
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view transitions
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@property
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:has()
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filter()
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relative color syntax
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percentage values in lch() & oklch()
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contrast-color()
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linear() easing function
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subgrid
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@page
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display: two-value syntax
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opacity percentage values
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masonry layout
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anchor positioning
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gradient color spaces
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overflow-{block, inline}
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overflow-clip-margin
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@container style()
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scroll progress timelines
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view progress timelines
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content-visibility
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hanging-punctuation
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@counter-style
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counter-set
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stepped value functions (round(), mod(), rem())
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exponential functions (pow(), sqrt(), hypot(), log(), exp())
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sign-related functions (abs(), sign())
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numeric constants (e, pi, infinity)
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clip-path: external SVGs
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COLRv1 fonts
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forced-color-adjust
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:dir()
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font-family: ui-{serif, sans-serif, monospace, rounded}
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text-wrap
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{float, clear}: inline-{start, end}
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d: path()
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offset-anchor
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offset-position
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offset-path: ray()
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text-indent: {hanging, each-line}
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animation-composition
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object-view-box
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::-webkit-scrollbar
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scrollbar-color
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scrollbar-width
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::-webkit-slider-runnable-track
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::-webkit-slider-thumb
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::-moz-range-track
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::-moz-range-thumb
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::-moz-range-progress
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contain-intrinsic-size
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image-rendering: crisp-edges
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math-style
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math-shift
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math-depth
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orphans, widows
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overlay
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scrollbar-gutter
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text-justify
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toggle
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zoom (non-standard)
- line-grid
- mix()
- @page margin boxes
- page-based counters
- column combinator
- :nth-col(), :nth-last-col()
- @scope
- @custom-media
- toggle()
- cascade control
- linked parameters
- @extend
- content-size
- @filter
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@media (scripting)
- ::slotted()
- scroll-start
- :snapped
- sign-related functions in calc()
- src()
- {rex, rch, cap, rcap, ric} units
- @when, @else
- :local-link
- :target-within
- :current, :past, :future
- :playing, :paused, :seeking
- :buffering, :stalled
- :muted, :volume-locked
- @supports at-rule()
- CSS extensions
- variable units
- focus-group
- caret-shape
- copy-into
- exclusions (wrap-flow & wrap-through)
- regions (flow-into & flow-from)
- rhythmic sizing
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nesting
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JavaScript
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Array.prototype.{toReversed(), toSorted(), toSpliced(), with()}
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file system access
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file handling
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worker modules
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navigator.storage.estimate()
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navigator.storage.estimate(): usageDetails
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navigator.userAgentData
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WebGPU
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Array.prototype.{group(), groupToMap()}
- import attributes
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import attributes with deprecated 'assert' keyword
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Temporal
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Navigation
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Sanitizer
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URLPattern
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local font access
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EyeDropper
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Intl.Segmenter
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HID
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USB
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Serial
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Bluetooth
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background fetch
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handwriting recognition
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background sync
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periodic background sync
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WebXR
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speech recognition
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directory upload (webkitdirectory)
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document.caretPositionFromPoint
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document.caretRangeFromPoint (non-standard)
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custom highlight
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barcode detection
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face detection
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text detection
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clipboard read
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clipboard write()
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requestIdleCallback
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MIDI
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custom protocol handling
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beforeinstallprompt event
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navigator.share()
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navigator.share(): files
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share target
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background blur
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indexedDB.databases()
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ScrollTimeline
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canvas color spaces
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CSS.registerProperty()
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CSS typed object model
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animation worklet
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Painting API
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Layout API
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document.fragmentDirective
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document.fragmentDirective.createSelectorDirective()
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EditContext API
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Web Neural Network API
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Model Loader API
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contentvisibilityautostatechange event
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scrollend event
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vibration
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ambient light sensor
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badging
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deviceorientationabsolute event
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clipboard web custom formats
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compute pressure
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contact picker
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Content Index
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WebCodecs: video
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WebCodecs: audio
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CookieStore
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battery status
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custom state pseudo class
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Idle Detection
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is input pending
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JS Self-Profiling
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measure memory
- type annotations
- folder handling
- record & tuple
- PDF generation
- pipeline operator
- requestPostAnimationFrame()
- Color
- CSS.customMedia()
- spatial navigation
- {snapchanged, snapchanging} event
- layout transition primitives
- CSS Parser API
- Font Metrics API
- Box Tree API
- decorators
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Array.prototype.{toReversed(), toSorted(), toSpliced(), with()}
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WebAssembly
Web features
This site provides an overview of many web features that are not yet fully supported (unprefixed) in all three major browser engines. These range from features already implemented in two browser engines up to unofficial drafts and even just proposals. The three major browser engines are:
| Logo | Browser engine | Associated browser | Company |
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Blink | Chrome/Chromium | |
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WebKit | Safari | Apple |
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Gecko | Firefox | Mozilla |
Legend
| Icon | Description |
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The feature is supported in the current stable version of the associated browser. |
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The feature is experimentally supported in a developer preview version of the associated browser. A special flag might need to be enabled. |
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The feature uses a non-standard, vendor-prefixed name. |
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The feature has limited support (e.g. not available on all platforms) |