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Settings Index CSS ::first-letter CSS pseudo-element selector ::placeholder CSS pseudo-element ::selection CSS pseudo-element :dir() CSS pseudo-class :has() CSS relational pseudo-class :in-range and :out-of-range CSS pseudo-classes :matches() CSS pseudo-class :placeholder-shown CSS pseudo-class @font-face Web fonts Blending of HTML/SVG elements calc() as CSS unit value Case-insensitive CSS attribute selectors ch (character) unit CSS 2.1 selectors CSS ::marker pseudo-element CSS :any-link selector CSS :read-only and :read-write selectors CSS all property CSS Animation CSS Appearance CSS background-attachment CSS background-blend-mode CSS background-position edge offsets CSS background-repeat round and space CSS box-decoration-break CSS caret-color CSS clip-path property (for HTML) CSS Conical Gradients CSS Containment CSS Counter Styles CSS Counters CSS currentColor value CSS Device Adaptation CSS display: contents CSS element() function CSS Exclusions Level 1 CSS Feature Queries CSS Filter Effects CSS filter() function for image values CSS first-line pseudo-element CSS Flexible Box Layout Module CSS Font Loading CSS font-feature-settings CSS font-rendering controls CSS font-size-adjust CSS font-stretch CSS font-variant-alternates CSS font-variant-numeric CSS Generated content for pseudo-elements CSS grab & grabbing cursors CSS Gradients CSS Grid Layout (level 1) CSS hanging-punctuation CSS Hyphenation CSS image-set CSS Initial Letter CSS initial value CSS inline-block CSS justify-content: space-evenly CSS Logical Properties CSS Masks CSS math functions min(), max() and clamp() CSS min/max-width/height CSS Motion Path CSS namespaces CSS outline properties CSS overflow property CSS overflow-anchor (Scroll Anchoring) CSS page-break properties CSS Paint API CSS position:fixed CSS position:sticky CSS Regions CSS Repeating Gradients CSS resize property CSS revert value CSS Scroll Snap CSS Shapes Level 1 CSS Subgrid CSS Table display CSS text-indent CSS text-justify CSS text-orientation CSS touch-action property CSS unset value CSS user-select: none CSS Variables (Custom Properties) CSS widows & orphans CSS will-change property CSS writing-mode property CSS3 2D Transforms CSS3 3D Transforms CSS3 attr() function for all properties 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 CSSOM Scroll-behavior display: flow-root display: run-in Font unicode-range subsetting gap property for Flexbox getComputedStyle Intrinsic & Extrinsic Sizing letter-spacing CSS property Media Queries: interaction media features Media Queries: resolution feature Rebeccapurple color rem (root em) units selector list argument of :not() SVG in CSS backgrounds system-ui value for font-family text-decoration styling text-emphasis styling TTF/OTF - TrueType and OpenType font support Variable fonts Viewport units: vw, vh, vmin, vmax Window.devicePixelRatio #rrggbbaa hex color notation :default CSS pseudo-class :focus-visible CSS pseudo-class :focus-within CSS pseudo-class :indeterminate CSS pseudo-class :optional CSS pseudo-class background-position-x & background-position-y Crisp edges/pixelated images CSS @apply rule CSS Backdrop Filter CSS Canvas Drawings CSS color-adjust CSS Cross-Fade Function CSS Environment Variables env() CSS font-smooth CSS line-clamp CSS overscroll-behavior CSS pointer-events (for HTML) CSS Reflections CSS scrollbar styling CSS text-size-adjust CSS text-stroke and text-fill CSS zoom Explicit descendant combinator >> High-quality kerning pairs & ligatures prefers-color-scheme media query prefers-reduced-motion media query Scoped CSS selector list argument of :nth-child and :nth-last-child CSS pseudo-classes All CSS features HTML5 accept attribute for file input async attribute for external scripts Attributes for form submission Audio element Audio Tracks Autofocus attribute Canvas (basic support) Canvas blend modes classList (DOMTokenList) Color input type contenteditable attribute (basic support) Custom Elements (V1) Custom protocol handling Datalist element dataset & data-* attributes Date and time input types defer attribute for external scripts Details & Summary elements Dialog element disabled attribute of the fieldset element Download attribute Drag and Drop Email, telephone & URL input types Form attribute Form validation getElementsByClassName Hashchange event hidden attribute HTML Imports HTML Media Capture HTML templates HTML5 form features HTML5 semantic elements indeterminate checkbox Inline SVG in HTML5 input event input placeholder attribute inputmode attribute Lazy loading via attribute for images & iframes Link type "noreferrer" maxlength attribute for input and textarea elements meter element Minimum length attribute for input fields Multiple file selection naturalWidth & naturalHeight image properties Number input type OffscreenCanvas PageTransitionEvent Path2D Pattern attribute for input fields Picture element Ping attribute PNG favicons Printing Events progress element Range input type readonly attribute of input and textarea elements rel=noopener relList (DOMTokenList) Reversed attribute of ordered lists Ruby annotation sandbox 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 SVG favicons tabindex global attribute Text API for Canvas Video element Video Tracks wbr (word break opportunity) element Web App Manifest WebGL - 3D Canvas graphics WebGL 2.0 Context menu item (menuitem element) Custom Elements (deprecated V0 spec) Offline web applications seamless attribute for iframes All HTML5 features Security 'SameSite' cookie attribute ChaCha20-Poly1305 cipher suites for TLS Content Security Policy 1.0 Content Security Policy Level 2 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 All Security features Other "once" event listener option AAC audio file format autocomplete attribute: on & off values AV1 video format AVIF image format Brotli Accept-Encoding/Content-Encoding ChildNode.remove() Client Hints: DPR, Width, Viewport-Width CSS Paged Media (@page) Data URIs document.elementFromPoint() document.head document.scrollingElement DOM manipulation convenience methods DOMContentLoaded DOMMatrix Dynamic Adaptive Streaming over HTTP (MPEG-DASH) Element.closest() Element.insertAdjacentElement() & Element.insertAdjacentText() ES6 Generators EventTarget.addEventListener() EventTarget.dispatchEvent FLAC audio format focusin & focusout events HEIF/ISO Base Media File Format HEVC/H.265 video format HTMLElement.innerText HTTP/2 protocol HTTP/3 protocol JPEG 2000 image format JPEG XR image format KeyboardEvent.code KeyboardEvent.getModifierState() KeyboardEvent.key KeyboardEvent.location MathML Media Fragments MP3 audio format MPEG-4/H.264 video format Mutation events Node.compareDocumentPosition() Node.textContent Ogg Vorbis audio format Ogg/Theora video format Opus Passive event listeners PNG alpha transparency querySelector/querySelectorAll Resource Hints: dns-prefetch Resource Hints: modulepreload Resource Hints: preconnect Resource Hints: prefetch Resource Hints: preload Resource Hints: prerender SDCH Accept-Encoding/Content-Encoding Shadow DOM...