| Name | Support Tables |
| Version | |
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| Last Updated | 2022-04-11T17:49:08Z |
Table of Contents
- Canvas
-
CSS
- #rrggbbaa hex color notation
- ::first-letter CSS pseudo-element selector
- ::placeholder CSS pseudo-element
- ::selection CSS pseudo-element
- :default CSS pseudo-class
- :dir() CSS pseudo-class
- :focus-visible CSS pseudo-class
- :focus-within CSS pseudo-class
- :has() CSS relational pseudo-class
- :in-range and :out-of-range CSS pseudo-classes
- :indeterminate CSS pseudo-class
- :is() CSS pseudo-class
- :optional CSS pseudo-class
- :placeholder-shown CSS pseudo-class
- Background-clip: text
- background-position-x & background-position-y
- Blending of HTML/SVG elements
- Case-insensitive CSS attribute selectors
- Crisp edges/pixelated images
- CSS -webkit-user-drag property
- CSS :any-link selector
- CSS :read-only and :read-write selectors
- CSS @scroll-timeline
- CSS @when / @else conditional rules
- CSS all property
- CSS Appearance
- CSS Backdrop Filter
- CSS background-attachment
- CSS background-blend-mode
- CSS Canvas Drawings
- CSS caret-color
- CSS Cascade Layers
- CSS color() function
- CSS color-adjust
- CSS Conical Gradients
- CSS Container Queries
- CSS Containment
- CSS content-visibility
- CSS Cross-Fade Function
- CSS currentColor value
- CSS Device Adaptation
- CSS display: contents
- CSS Environment Variables env()
- CSS Exclusions Level 1
- CSS Filter Effects
- CSS filter() function
- CSS font-display
- CSS font-palette
- CSS font-size-adjust
- CSS font-stretch
- CSS font-variant-numeric
- CSS Grid Layout (level 1)
- CSS hanging-punctuation
- CSS image-set
- CSS Initial Letter
- CSS initial value
- CSS justify-content: space-evenly
- CSS line-clamp
- CSS Logical Properties
- CSS Masks
- CSS math functions min(), max() and clamp()
- CSS Motion Path
- CSS namespaces
- CSS overflow property
- CSS overflow: overlay
- CSS overscroll-behavior
- CSS page-break properties
- CSS Paint API
- CSS position:fixed
- CSS position:sticky
- CSS Reflections
- CSS revert value
- CSS Scroll Snap
- CSS scrollbar styling
- CSS Subgrid
- CSS text-indent
- CSS text-justify
- CSS text-orientation
- CSS text-stroke and text-fill
- CSS touch-action property
- CSS unset value
- CSS user-select: none
- CSS widows & orphans
- CSS will-change property
- CSS writing-mode property
- CSS zoom
- CSS3 attr() function for all properties
- CSSOM Scroll-behavior
- display: flow-root
- display: run-in
- Explicit descendant combinator >>
- gap property for Flexbox
- High-quality kerning pairs & ligatures
- Large, Small, and Dynamic viewport units
- LCH and Lab color values
- letter-spacing CSS property
- Media Queries: interaction media features
- Media Queries: resolution feature
- prefers-color-scheme media query
- prefers-reduced-motion media query
- Rebeccapurple color
- Scoped CSS
- selector list argument of :not()
- selector list argument of :nth-child and :nth-last-child CSS pseudo-classes
- system-ui value for font-family
- ui-serif, ui-sans-serif, ui-monospace and ui-rounded values for font-family
- Variable fonts
- Window.devicePixelRatio
- CSS2
-
CSS3
- @font-face Web fonts
- calc() as CSS unit value
- ch (character) unit
- CSS ::marker pseudo-element
- CSS Animation
- CSS background-position edge offsets
- CSS background-repeat round and space
- CSS box-decoration-break
- CSS clip-path property (for HTML)
- CSS Counter Styles
- CSS element() function
- CSS Feature Queries
- CSS first-line pseudo-element
- CSS Flexible Box Layout Module
- CSS Font Loading
- CSS font-feature-settings
- CSS font-smooth
- CSS font-variant-alternates
- CSS grab & grabbing cursors
- CSS Gradients
- CSS Hyphenation
- CSS outline properties
- CSS overflow-anchor (Scroll Anchoring)
- CSS pointer-events (for HTML)
- CSS Regions
- CSS Repeating Gradients
- CSS resize property
- CSS Shapes Level 1
- CSS text-size-adjust
- CSS Variables (Custom Properties)
- CSS3 2D Transforms
- CSS3 3D Transforms
- CSS3 Background-image options
- CSS3 Border images
- CSS3 Border-radius (rounded corners)
- CSS3 Box-shadow
- CSS3 Box-sizing
- CSS3 Colors
- CSS3 Cursors (original values)
- CSS3 Cursors: zoom-in & zoom-out
- CSS3 font-kerning
- CSS3 image-orientation
- CSS3 Media Queries
- CSS3 Multiple backgrounds
- CSS3 Multiple column layout
- CSS3 object-fit/object-position
- CSS3 Opacity
- CSS3 Overflow-wrap
- CSS3 selectors
- CSS3 tab-size
- CSS3 text-align-last
- CSS3 Text-overflow
- CSS3 Text-shadow
- CSS3 Transitions
- CSS3 word-break
- Font unicode-range subsetting
- getComputedStyle
- Intrinsic & Extrinsic Sizing
- rem (root em) units
- text-decoration styling
- text-emphasis styling
- TTF/OTF - TrueType and OpenType font support
- Viewport units: vw, vh, vmin, vmax
-
DOM
- "once" event listener option
- async attribute for external scripts
- autocomplete attribute: on & off values
- Auxclick
- ChildNode.remove()
- classList (DOMTokenList)
- Client Hints: DPR, Width, Viewport-Width
- CSS.supports() API
- Custom Elements (deprecated V0 spec)
- Custom Elements (V1)
- CustomEvent
- defer attribute for external scripts
- Dialog element
- Directory selection from file input
- disabled attribute of the fieldset element
- Document Object Model Range
- document.elementFromPoint()
- document.evaluate & XPath
- document.head
- document.scrollingElement
- DOM manipulation convenience methods
- DOM Parsing and Serialization
- DOMContentLoaded
- DOMMatrix
- Element.closest()
- Element.insertAdjacentElement() & Element.insertAdjacentText()
- Element.scrollIntoViewIfNeeded()
- EventTarget.addEventListener()
- EventTarget.dispatchEvent
- focusin & focusout events
- getElementsByClassName
- HTML Imports
- HTML templates
- HTMLElement.innerText
- indeterminate checkbox
- input event
- inputmode attribute
- IntersectionObserver
- IntersectionObserver V2
- KeyboardEvent.charCode
- KeyboardEvent.code
- KeyboardEvent.getModifierState()
- KeyboardEvent.key
- KeyboardEvent.location
- KeyboardEvent.which
- Link type "noreferrer"
- matches() DOM method
- matchMedia
- maxlength attribute for input and textarea elements
- Media Capture from DOM Elements API
- Media Fragments
- Media Source Extensions
- MediaRecorder API
- Mutation events
- Mutation Observer
- naturalWidth & naturalHeight image properties
- Navigation Timing API
- Network Information API
- Node.compareDocumentPosition()
- Node.textContent
- Passive event listeners
- Picture element
- Pointer events
- querySelector/querySelectorAll
- readonly attribute of input and textarea elements
- rel=noopener
- relList (DOMTokenList)
- Resize Observer
- Resource Hints: dns-prefetch
- Resource Hints: Lazyload
- Resource Hints: modulepreload
- Resource Hints: preconnect
- Resource Hints: prefetch
- Resource Hints: preload
- Resource Hints: prerender
- Scroll methods on elements (scroll, scrollTo, scrollBy)
- scrollIntoView
- Shadow DOM (deprecated V0 spec)
- Shadow DOM (V1)
- theme-color Meta Tag
- Touch events
- Trusted Types for DOM manipulation
- Web Animations API
- XMLHttpRequest advanced features
-
HTML5
- accept attribute for file input
- Add to home screen (A2HS)
- Attributes for form submission
- Audio element
- Audio Tracks
- Autofocus attribute
- Color input type
- contenteditable attribute (basic support)
- Context menu item (menuitem element)
- Custom protocol handling
- Datalist element
- dataset & data-* attributes
- Date and time input types
- Details & Summary elements
- Download attribute
- Drag and Drop
- Email, telephone & URL input types
- Form attribute
- Form validation
- Hashchange event
- hidden attribute
- HTML Media Capture
- HTML5 form features
- HTML5 semantic elements
- Inline SVG in HTML5
- input placeholder attribute
- Lazy loading via attribute for images & iframes
- meter element
- Minimum length attribute for input fields
- Multiple file selection
- Number input type
- Offline web applications
- OffscreenCanvas
- PageTransitionEvent
- Pattern attribute for input fields
- Ping attribute
- PNG favicons
- Portals
- Printing Events
- progress element
- Range input type
- Reversed attribute of ordered lists
- Ruby annotation
- sandbox attribute for iframes
- seamless attribute for iframes
- Search input type
- Selection controls for input & textarea
- Session history management
- Spellcheck attribute
- srcdoc attribute for iframes
- Srcset and sizes attributes
- Subresource Integrity
- tabindex global attribute
- Video element
- Video Tracks
- wbr (word break opportunity) element
-
JS
- Array.prototype.find
- Array.prototype.findIndex
- Array.prototype.includes
- Arrow functions
- asm.js
- Async functions
- BigInt
- const
- Date.prototype.toLocaleDateString
- Decorators
- ECMAScript 2015 (ES6)
- ECMAScript 5
- ECMAScript 5 Strict Mode
- ES6 classes
- ES6 Generators
- ES6 Number
- ES6 Template Literals (Template Strings)
- flat & flatMap array methods
- Import maps
- Internationalization API
- Intl.PluralRules API
- JavaScript modules via script tag
- JavaScript modules: dynamic import()
- JSON parsing
- let
- localeCompare()
- Lookbehind in JS regular expressions
- Object.entries
- Object.observe data binding
- Object.values method
- Promise.prototype.finally
- Promises
- Proxy object
- Rest parameters
- Shared Array Buffer
- String.prototype.includes
- String.prototype.padStart(), String.prototype.padEnd()
- Temporal
- Typed Arrays
- unhandledrejection/rejectionhandled events
-
JS API
- AbortController & AbortSignal
- Accelerometer
- Ambient Light Sensor
- Asynchronous Clipboard API
- Background Sync API
- Base64 encoding and decoding
- Basic console logging functions
- Battery Status API
- Beacon API
- Blob constructing
- Blob URLs
- BroadcastChannel
- Channel messaging
- console.time and console.timeEnd
- Constraint Validation API
- Cookie Store API
- createImageBitmap
- Credential Management API
- Cross-document messaging
- Cross-Origin Resource Sharing
- crypto.getRandomValues()
- DeviceOrientation & DeviceMotion events
- Do Not Track API
- document.currentScript
- Document.execCommand()
- Efficient Script Yielding: setImmediate()
- Element.getBoundingClientRect()
- Element.insertAdjacentHTML()
- Encrypted Media Extensions
- Feature Policy
- Fetch
- FIDO U2F API
- File API
- File System Access API
- FileReader API
- FileReaderSync
- Filesystem & FileWriter API
- Full Screen API
- Gamepad API
- Geolocation
- getUserMedia/Stream API
- Gyroscope
- High Resolution Time API
- IndexedDB
- IndexedDB 2.0
- Input Method Editor API
- Magnetometer
- navigator.hardwareConcurrency
- Object RTC (ORTC) API for WebRTC
- Online/offline status
- Orientation Sensor
- Page Visibility
- Payment Request API
- Permissions API
- Permissions Policy
- Picture-in-Picture
- Pointer Lock API
- Proximity API
- Push API
- requestAnimationFrame
- requestIdleCallback
- Resource Timing
- Screen Orientation
- Screen Wake Lock API
- Selection API
- Server Timing
- Server-sent events
- Service Workers
- Shared Web Workers
- Speech Recognition API
- Speech Synthesis API
- Streams
- Synchronous Clipboard API
- TextEncoder & TextDecoder
- URL API
- URLSearchParams
- User Timing API
- Vibration API
- Web Audio API
- Web Bluetooth
- Web Cryptography
- Web MIDI API
- Web NFC
- Web Notifications
- Web Serial API
- Web Share API
- Web Sockets
- Web SQL Database
- Web Storage - name/value pairs
- Web Workers
- WebGPU
- WebHID API
- WebRTC Peer-to-peer connections
- WebUSB
- WebVR API
- WebXR Device API
-
Other
- AAC audio file format
- AV1 video format
- AVIF image format
- Brotli Accept-Encoding/Content-Encoding
- Built-in PDF viewer
- COLR/CPAL(v0) Font Formats
- COLR/CPAL(v1) Font Formats
- CSS Nesting
- CSS Paged Media (@page)
- Data URIs
- Document Policy
- Dynamic Adaptive Streaming over HTTP (MPEG-DASH)
- EOT - Embedded OpenType fonts
- FLAC audio format
- HEIF/ISO Base Media File Format
- HEVC/H.265 video format
- HTTP Live Streaming (HLS)
- HTTP/2 protocol
- HTTP/3 protocol
- JPEG 2000 image format
- JPEG XL image format
- JPEG XR image format
- MathML
- MP3 audio format
- MPEG-4/H.264 video format
- Ogg Vorbis audio format
- Ogg/Theora video format
- Opus
- SDCH Accept-Encoding/Content-Encoding
- Signed HTTP Exchanges (SXG)
- SPDY protocol
- URL Scroll-To-Text Fragment
- WAI-ARIA Accessibility features
- Wav audio format
- WebAssembly
- WebM video format
- WebP image format
- WebVTT - Web Video Text Tracks
- WOFF - Web Open Font Format
- WOFF 2.0 - Web Open Font Format
- XHTML served as application/xhtml+xml
- XHTML+SMIL animation
- PNG
-
Security
- 'SameSite' cookie attribute
- ChaCha20-Poly1305 cipher suites for TLS
- Content Security Policy 1.0
- Content Security Policy Level 2
- DNSSEC and DANE
- HTTP Public Key Pinning
- Referrer Policy
- Server Name Indication
- Strict Transport Security
- TLS 1.1
- TLS 1.2
- TLS 1.3
- Upgrade Insecure Requests
- Web Authentication API
- X-Frame-Options HTTP header
- SVG