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DOM

"once" event listener option

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

Blending of HTML/SVG elements

CSS -webkit-user-drag property

CSS :any-link selector

CSS :read-only and :read-write selectors

CSS @apply rule

CSS @scroll-timeline

CSS Appearance

CSS Backdrop Filter

CSS Canvas Drawings

CSS Cascade Layers

CSS Conical Gradients

CSS Container Queries

CSS Containment

CSS Cross-Fade Function

CSS Device Adaptation

CSS Environment Variables env()

CSS Exclusions Level 1

CSS Filter Effects

CSS Grid Layout (level 1)

CSS Initial Letter

CSS Logical Properties

CSS Masks

CSS Motion Path

CSS Paint API

CSS Reflections

CSS Scroll Snap

CSS Subgrid

CSS all property

CSS background-attachment

CSS background-blend-mode

CSS caret-color

CSS color() function

CSS color-adjust

CSS content-visibility

CSS currentColor value

CSS display: contents

CSS filter() function

CSS font-display

CSS font-size-adjust

CSS font-stretch

CSS font-variant-numeric

CSS hanging-punctuation

CSS image-set

CSS initial value

CSS justify-content: space-evenly

CSS line-clamp

CSS math functions min(), max() and clamp()

CSS namespaces

CSS overflow property

CSS overflow: overlay

CSS overscroll-behavior

CSS page-break properties

CSS position:fixed

CSS position:sticky

CSS revert value

CSS scrollbar styling

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

Case-insensitive CSS attribute selectors

Crisp edges/pixelated images

Explicit descendant combinator >>

High-quality kerning pairs & ligatures

Large, Small, and Dynamic viewport units

Media Queries: interaction media features

Media Queries: resolution feature

Rebeccapurple color

Scoped CSS

Variable fonts

Window.devicePixelRatio

background-position-x & background-position-y

display: flow-root

display: run-in

gap property for Flexbox

letter-spacing CSS property

prefers-color-scheme media query

prefers-reduced-motion media query

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

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

CSS3

@font-face Web fonts

CSS ::marker pseudo-element

CSS Animation

CSS Counter Styles

CSS Feature Queries

CSS Flexible Box Layout Module

CSS Font Loading

CSS Gradients

CSS Hyphenation

CSS Regions

CSS Repeating Gradients

CSS Shapes Level 1

CSS Variables (Custom Properties)

CSS background-position edge offsets

CSS background-repeat round and space

CSS box-decoration-break

CSS clip-path property (for HTML)

CSS element() function

CSS first-line pseudo-element

CSS font-feature-settings

CSS font-smooth

CSS font-variant-alternates

CSS grab & grabbing cursors

CSS outline properties

CSS overflow-anchor (Scroll Anchoring)

CSS pointer-events (for HTML)

CSS resize property

CSS text-size-adjust

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 Media Queries

CSS3 Multiple backgrounds

CSS3 Multiple column layout

CSS3 Opacity

CSS3 Overflow-wrap

CSS3 Text-overflow

CSS3 Text-shadow

CSS3 Transitions

CSS3 font-kerning

CSS3 image-orientation

CSS3 object-fit/object-position

CSS3 selectors

CSS3 tab-size

CSS3 text-align-last

CSS3 word-break

Font unicode-range subsetting

Intrinsic & Extrinsic Sizing

TTF/OTF - TrueType and OpenType font support

Viewport units: vw, vh, vmin, vmax

calc() as CSS unit value

ch (character) unit

getComputedStyle

rem (root em) units

text-decoration styling

text-emphasis styling

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

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

MP3 audio format

MPEG-4/H.264 video format

MathML

Ogg Vorbis audio format

Ogg/Theora video format

Opus

SDCH Accept-Encoding/Content-Encoding

SPDY protocol

Signed HTTP Exchanges (SXG)

URL Scroll-To-Text Fragment

WAI-ARIA Accessibility features

WOFF - Web Open Font Format

WOFF 2.0 - Web Open Font Format

Wav audio format

WebAssembly

WebM video format

WebP image format

WebVTT - Web Video Text Tracks

XHTML served as application/xhtml+xml

XHTML+SMIL animation

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 URLs

Blob constructing

BroadcastChannel

Channel messaging

Constraint Validation API

Cookie Store API

Credential Management API

Cross-Origin Resource Sharing

Cross-document messaging

DeviceOrientation & DeviceMotion events

Do Not Track API

Document.execCommand()

Efficient Script Yielding: setImmediate()

Element.getBoundingClientRect()

Element.insertAdjacentHTML()

Encrypted Media Extensions

FIDO U2F API

Feature Policy

Fetch

File API

File System Access API

FileReader API

FileReaderSync

Filesystem & FileWriter API

Full Screen API

Gamepad API

Geolocation

Gyroscope

High Resolution Time API

IndexedDB

IndexedDB 2.0

Input Method Editor API

Magnetometer

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

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 SQL Database

Web Serial API

Web Share API

Web Sockets

Web Storage - name/value pairs

Web Workers

WebGPU

WebHID API

WebRTC Peer-to-peer connections

WebUSB

WebVR API

WebXR Device API

console.time and console.timeEnd

createImageBitmap

crypto.getRandomValues()

document.currentScript

getUserMedia/Stream API

navigator.hardwareConcurrency

requestAnimationFrame

requestIdleCallback

HTML5

Add to home screen (A2HS)

Attributes for form submission

Audio Tracks

Audio element

Autofocus attribute

Color input type

Context menu item (menuitem element)

Custom protocol handling

Datalist element

Date and time input types

Details & Summary elements

Download attribute

Drag and Drop

Email, telephone & URL input types

Form attribute

Form validation

HTML Media Capture

HTML5 form features

HTML5 semantic elements

Hashchange event

Inline SVG in HTML5

Lazy loading via attribute for images & iframes

Minimum length attribute for input fields

Multiple file selection

Number input type

Offline web applications

OffscreenCanvas

PNG favicons

PageTransitionEvent

Pattern attribute for input fields

Ping attribute

Portals

Printing Events

Range input type

Reversed attribute of ordered lists

Ruby annotation

Search input type

Selection controls for input & textarea

Session history management

Spellcheck attribute

Srcset and sizes attributes

Subresource Integrity

Video Tracks

Video element

accept attribute for file input

contenteditable attribute (basic support)

dataset & data-* attributes

hidden attribute

input placeholder attribute

meter element

progress element

sandbox attribute for iframes

seamless attribute for iframes

srcdoc attribute for iframes

tabindex global attribute

wbr (word break opportunity) element

PNG

Animated PNG (APNG)

PNG alpha transparency

JS

Array.prototype.find

Array.prototype.findIndex

Array.prototype.includes

Arrow functions

Async functions

BigInt

Date.prototype.toLocaleDateString

Decorators

ECMAScript 2015 (ES6)

ECMAScript 5

ECMAScript 5 Strict Mode

ES6 Generators

ES6 Number

ES6 Template Literals (Template Strings)

ES6 classes

Import maps

Internationalization API

Intl.PluralRules API

JSON parsing

JavaScript modules via script tag

JavaScript modules: dynamic import()

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

asm.js

const

flat & flatMap array methods

let

localeCompare()

unhandledrejection/rejectionhandled events

Auxclick

CSS.supports() API

Canvas

Canvas (basic support)

Canvas blend modes

ChildNode.remove()

Client Hints: DPR, Width, Viewport-Width

Custom Elements (V1)

Custom Elements (deprecated V0 spec)

CustomEvent

DOM Parsing and Serialization

DOM manipulation convenience methods

DOMContentLoaded

DOMMatrix

Dialog element

Directory selection from file input

Document Object Model Range

Element.closest()

Element.insertAdjacentElement() & Element.insertAdjacentText()

Element.scrollIntoViewIfNeeded()

EventTarget.addEventListener()

EventTarget.dispatchEvent

HTML Imports

HTML templates

HTMLElement.innerText

IntersectionObserver

IntersectionObserver V2

KeyboardEvent.charCode

KeyboardEvent.code

KeyboardEvent.getModifierState()

KeyboardEvent.key

KeyboardEvent.location

KeyboardEvent.which

Link type "noreferrer"

Media Capture from DOM Elements API

Media Fragments

Media Source Extensions

MediaRecorder API

Mutation Observer

Mutation events

Navigation Timing API

Network Information API

Node.compareDocumentPosition()

Node.textContent

Passive event listeners

Path2D

Picture element

Pointer events

Resize Observer

Resource Hints: Lazyload

Resource Hints: dns-prefetch

Resource Hints: modulepreload

Resource Hints: preconnect

Resource Hints: prefetch

Resource Hints: preload

Resource Hints: prerender

Scroll methods on elements (scroll, scrollTo, scrollBy)

Shadow DOM (V1)

Shadow DOM (deprecated V0 spec)

Text API for Canvas

Touch events

Trusted Types for DOM manipulation

Web Animations API

WebGL - 3D Canvas graphics

WebGL 2.0

XMLHttpRequest advanced features

async attribute for external scripts

autocomplete attribute: on & off values

classList (DOMTokenList)

defer attribute for external scripts

disabled attribute of the fieldset element

document.elementFromPoint()

document.evaluate & XPath

document.head

document.scrollingElement

focusin & focusout events

getElementsByClassName

indeterminate checkbox

input event

inputmode attribute

matchMedia

matches() DOM method

maxlength attribute for input and textarea elements

naturalWidth & naturalHeight image properties

querySelector/querySelectorAll

readonly attribute of input and textarea elements

rel=noopener

relList (DOMTokenList)

scrollIntoView

theme-color Meta Tag

CSS2

CSS 2.1 selectors

CSS Counters

CSS Generated content for pseudo-elements

CSS Table display

CSS inline-block

CSS min/max-width/height

SVG

SVG (basic support)

SVG SMIL animation

SVG effects for HTML

SVG favicons

SVG filters

SVG fonts

SVG fragment identifiers

SVG in CSS backgrounds

SVG in HTML img element

SVG vector-effect: non-scaling-stroke

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