Index

CSS

  1. #rrggbbaa hex color notation
  2. ::first-letter CSS pseudo-element selector
  3. ::placeholder CSS pseudo-element
  4. ::selection CSS pseudo-element
  5. :dir() CSS pseudo-class
  6. :has() CSS relational pseudo-class
  7. :in-range and :out-of-range CSS pseudo-classes
  8. :is() CSS pseudo-class
  9. :placeholder-shown CSS pseudo-class
  10. @font-face Web fonts
  11. Blending of HTML/SVG elements
  12. calc() as CSS unit value
  13. Case-insensitive CSS attribute selectors
  14. ch (character) unit
  15. CSS 2.1 selectors
  16. CSS ::marker pseudo-element
  17. CSS :any-link selector
  18. CSS :read-only and :read-write selectors
  19. CSS @when / @else conditional rules
  20. CSS all property
  21. CSS Animation
  22. CSS Appearance
  23. CSS background-attachment
  24. CSS background-blend-mode
  25. CSS background-position edge offsets
  26. CSS background-repeat round and space
  27. CSS box-decoration-break
  28. CSS caret-color
  29. CSS Cascade Layers
  30. CSS clip-path property (for HTML)
  31. CSS color() function
  32. CSS color-adjust
  33. CSS Conical Gradients
  34. CSS Container Queries (Size)
  35. CSS Container Query Units
  36. CSS Containment
  37. CSS content-visibility
  38. CSS Counter Styles
  39. CSS Counters
  40. CSS Cross-Fade Function
  41. CSS currentColor value
  42. CSS Device Adaptation
  43. CSS display: contents
  44. CSS element() function
  45. CSS Exclusions Level 1
  46. CSS Feature Queries
  47. CSS Filter Effects
  48. CSS filter() function
  49. CSS first-line pseudo-element
  50. CSS Flexible Box Layout Module
  51. CSS Font Loading
  52. CSS font-display
  53. CSS font-feature-settings
  54. CSS font-palette
  55. CSS font-size-adjust
  56. CSS font-stretch
  57. CSS font-variant-alternates
  58. CSS font-variant-numeric
  59. CSS Generated content for pseudo-elements
  60. CSS grab & grabbing cursors
  61. CSS Gradients
  62. CSS Grid Layout (level 1)
  63. CSS hanging-punctuation
  64. CSS Hyphenation
  65. CSS image-set
  66. CSS Initial Letter
  67. CSS initial value
  68. CSS inline-block
  69. CSS justify-content: space-evenly
  70. CSS line-clamp
  71. CSS Logical Properties
  72. CSS Masks
  73. CSS math functions min(), max() and clamp()
  74. CSS min/max-width/height
  75. CSS Motion Path
  76. CSS namespaces
  77. CSS outline properties
  78. CSS overflow property
  79. CSS overflow-anchor (Scroll Anchoring)
  80. CSS overscroll-behavior
  81. CSS page-break properties
  82. CSS Paint API
  83. CSS position:fixed
  84. CSS position:sticky
  85. CSS Regions
  86. CSS Repeating Gradients
  87. CSS resize property
  88. CSS revert value
  89. CSS Scroll Snap
  90. CSS Scroll-behavior
  91. CSS Shapes Level 1
  92. CSS Subgrid
  93. CSS Table display
  94. CSS text-indent
  95. CSS text-justify
  96. CSS text-orientation
  97. CSS touch-action property
  98. CSS unset value
  99. CSS user-select: none
  100. CSS Variables (Custom Properties)
  101. CSS widows & orphans
  102. CSS will-change property
  103. CSS writing-mode property
  104. CSS3 2D Transforms
  105. CSS3 3D Transforms
  106. CSS3 Background-image options
  107. CSS3 Border images
  108. CSS3 Border-radius (rounded corners)
  109. CSS3 Box-shadow
  110. CSS3 Box-sizing
  111. CSS3 Colors
  112. CSS3 Cursors (original values)
  113. CSS3 Cursors: zoom-in & zoom-out
  114. CSS3 font-kerning
  115. CSS3 image-orientation
  116. CSS3 Media Queries
  117. CSS3 Multiple backgrounds
  118. CSS3 Multiple column layout
  119. CSS3 object-fit/object-position
  120. CSS3 Opacity
  121. CSS3 Overflow-wrap
  122. CSS3 selectors
  123. CSS3 tab-size
  124. CSS3 text-align-last
  125. CSS3 Text-overflow
  126. CSS3 Text-shadow
  127. CSS3 Transitions
  128. CSS3 word-break
  129. display: flow-root
  130. display: run-in
  131. Font unicode-range subsetting
  132. gap property for Flexbox
  133. getComputedStyle
  134. Intrinsic & Extrinsic Sizing
  135. Large, Small, and Dynamic viewport units
  136. LCH and Lab color values
  137. letter-spacing CSS property
  138. Media Queries: interaction media features
  139. Media Queries: Range Syntax
  140. Media Queries: resolution feature
  141. prefers-color-scheme media query
  142. prefers-reduced-motion media query
  143. Rebeccapurple color
  144. rem (root em) units
  145. selector list argument of :not()
  146. selector list argument of :nth-child and :nth-last-child CSS pseudo-classes
  147. SVG in CSS backgrounds
  148. system-ui value for font-family
  149. text-decoration styling
  150. text-emphasis styling
  151. TTF/OTF - TrueType and OpenType font support
  152. ui-serif, ui-sans-serif, ui-monospace and ui-rounded values for font-family
  153. Variable fonts
  154. Viewport units: vw, vh, vmin, vmax
  155. Window.devicePixelRatio
  156. :default CSS pseudo-class
  157. :focus-visible CSS pseudo-class
  158. :focus-within CSS pseudo-class
  159. :indeterminate CSS pseudo-class
  160. :optional CSS pseudo-class
  161. Background-clip: text
  162. background-position-x & background-position-y
  163. Crisp edges/pixelated images
  164. CSS -webkit-user-drag property
  165. CSS @scroll-timeline
  166. CSS Backdrop Filter
  167. CSS Canvas Drawings
  168. CSS Environment Variables env()
  169. CSS font-smooth
  170. CSS overflow: overlay
  171. CSS pointer-events (for HTML)
  172. CSS Reflections
  173. CSS scrollbar styling
  174. CSS text-size-adjust
  175. CSS text-stroke and text-fill
  176. CSS zoom
  177. CSS3 attr() function for all properties
  178. Explicit descendant combinator >>
  179. High-quality kerning pairs & ligatures
  180. Scoped CSS
  181. All CSS features

HTML5

  1. accept attribute for file input
  2. Add to home screen (A2HS)
  3. async attribute for external scripts
  4. Attributes for form submission
  5. Audio element
  6. Audio Tracks
  7. Autofocus attribute
  8. Canvas (basic support)
  9. Canvas blend modes
  10. classList (DOMTokenList)
  11. Color input type
  12. contenteditable attribute (basic support)
  13. Custom Elements (V1)
  14. Custom protocol handling
  15. Datalist element
  16. dataset & data-* attributes
  17. Date and time input types
  18. defer attribute for external scripts
  19. Details & Summary elements
  20. Dialog element
  21. disabled attribute of the fieldset element
  22. Download attribute
  23. Drag and Drop
  24. Email, telephone & URL input types
  25. Form attribute
  26. Form validation
  27. getElementsByClassName
  28. Hashchange event
  29. hidden attribute
  30. HTML Imports
  31. HTML Media Capture
  32. HTML templates
  33. HTML5 semantic elements
  34. indeterminate checkbox
  35. Inline SVG in HTML5
  36. input event
  37. input placeholder attribute
  38. inputmode attribute
  39. Lazy loading via attribute for images & iframes
  40. Link type "noreferrer"
  41. maxlength attribute for input and textarea elements
  42. meter element
  43. Minimum length attribute for input fields
  44. Multiple file selection
  45. naturalWidth & naturalHeight image properties
  46. Number input type
  47. OffscreenCanvas
  48. PageTransitionEvent
  49. Path2D
  50. Pattern attribute for input fields
  51. Picture element
  52. Ping attribute
  53. PNG favicons
  54. Printing Events
  55. progress element
  56. Range input type
  57. readonly attribute of input and textarea elements
  58. rel=noopener
  59. relList (DOMTokenList)
  60. Reversed attribute of ordered lists
  61. Ruby annotation
  62. sandbox attribute for iframes
  63. Search input type
  64. Selection controls for input & textarea
  65. Session history management
  66. Spellcheck attribute
  67. srcdoc attribute for iframes
  68. Srcset and sizes attributes
  69. Subresource Integrity
  70. SVG favicons
  71. tabindex global attribute
  72. Text API for Canvas
  73. Video element
  74. Video Tracks
  75. wbr (word break opportunity) element
  76. WebGL - 3D Canvas graphics
  77. WebGL 2.0
  78. Context menu item (menuitem element)
  79. Custom Elements (deprecated V0 spec)
  80. Offline web applications
  81. Portals
  82. seamless attribute for iframes
  83. All HTML5 features

Other

  1. "once" event listener option
  2. AAC audio file format
  3. autocomplete attribute: on & off values
  4. AV1 video format
  5. AVIF image format
  6. Brotli Accept-Encoding/Content-Encoding
  7. Built-in PDF viewer
  8. ChildNode.remove()
  9. Client Hints: DPR, Width, Viewport-Width
  10. COLR/CPAL(v0) Font Formats
  11. COLR/CPAL(v1) Font Formats
  12. CSS Nesting
  13. CSS Paged Media (@page)
  14. Data URIs
  15. document.elementFromPoint()
  16. document.head
  17. document.scrollingElement
  18. DOM manipulation convenience methods
  19. DOMContentLoaded
  20. DOMMatrix
  21. Dynamic Adaptive Streaming over HTTP (MPEG-DASH)
  22. Element.closest()
  23. Element.insertAdjacentElement() & Element.insertAdjacentText()
  24. EventTarget.addEventListener()
  25. EventTarget.dispatchEvent
  26. FLAC audio format
  27. focusin & focusout events
  28. HEIF/ISO Base Media File Format
  29. HEVC/H.265 video format
  30. HTMLElement.innerText
  31. HTTP/2 protocol
  32. HTTP/3 protocol
  33. JPEG 2000 image format
  34. JPEG XL image format
  35. JPEG XR image format
  36. KeyboardEvent.code
  37. KeyboardEvent.getModifierState()
  38. KeyboardEvent.key
  39. KeyboardEvent.location
  40. MathML
  41. Media Fragments
  42. MP3 audio format
  43. MPEG-4/H.264 video format
  44. Mutation events
  45. Node.compareDocumentPosition()
  46. Node.textContent
  47. Ogg Vorbis audio format
  48. Ogg/Theora video format
  49. Opus
  50. Passive event listeners
  51. PNG alpha transparency
  52. querySelector/querySelectorAll
  53. Resource Hints: dns-prefetch
  54. Resource Hints: modulepreload
  55. Resource Hints: preconnect
  56. Resource Hints: prefetch
  57. Resource Hints: preload
  58. Resource Hints: prerender
  59. SDCH Accept-Encoding/Content-Encoding
  60. Shadow DOM (V1)
  61. Signed HTTP Exchanges (SXG)
  62. theme-color Meta Tag
  63. WAI-ARIA Accessibility features
  64. Wav audio format
  65. WebAssembly
  66. WebM video format
  67. WebP image format
  68. WebVTT - Web Video Text Tracks
  69. WOFF - Web Open Font Format
  70. WOFF 2.0 - Web Open Font Format
  71. XHTML served as application/xhtml+xml
  72. Animated PNG (APNG)
  73. Declarative Shadow DOM
  74. Document Policy
  75. EOT - Embedded OpenType fonts
  76. HTTP Live Streaming (HLS)
  77. KeyboardEvent.charCode
  78. KeyboardEvent.which
  79. Resource Hints: Lazyload
  80. Shadow DOM (deprecated V0 spec)
  81. SPDY protocol
  82. URL Scroll-To-Text Fragment
  83. XHTML+SMIL animation
  84. All Other features

JS API

  1. AbortController & AbortSignal
  2. Accelerometer
  3. Ambient Light Sensor
  4. Asynchronous Clipboard API
  5. Auxclick
  6. Base64 encoding and decoding
  7. Basic console logging functions
  8. Battery Status API
  9. Beacon API
  10. Blob constructing
  11. Blob URLs
  12. BroadcastChannel
  13. Channel messaging
  14. console.time and console.timeEnd
  15. Constraint Validation API
  16. createImageBitmap
  17. Credential Management API
  18. Cross-document messaging
  19. Cross-Origin Resource Sharing
  20. crypto.getRandomValues()
  21. CSS.supports() API
  22. CustomEvent
  23. DeviceOrientation & DeviceMotion events
  24. Do Not Track API
  25. Document Object Model Range
  26. document.currentScript
  27. DOM Parsing and Serialization
  28. Element.getBoundingClientRect()
  29. Element.insertAdjacentHTML()
  30. Encrypted Media Extensions
  31. Feature Policy
  32. Fetch
  33. File API
  34. FileReader API
  35. FileReaderSync
  36. Full Screen API
  37. Gamepad API
  38. Geolocation
  39. getUserMedia/Stream API
  40. Gyroscope
  41. High Resolution Time API
  42. IndexedDB
  43. IndexedDB 2.0
  44. Input Method Editor API
  45. IntersectionObserver
  46. Magnetometer
  47. matches() DOM method
  48. matchMedia
  49. Media Capture from DOM Elements API
  50. Media Source Extensions
  51. MediaRecorder API
  52. Mutation Observer
  53. Navigation Timing API
  54. navigator.hardwareConcurrency
  55. Object RTC (ORTC) API for WebRTC
  56. Online/offline status
  57. Orientation Sensor
  58. Page Visibility
  59. Payment Request API
  60. Permissions Policy
  61. Pointer events
  62. Pointer Lock API
  63. Proximity API
  64. Push API
  65. requestAnimationFrame
  66. requestIdleCallback
  67. Resource Timing
  68. Screen Orientation
  69. Screen Wake Lock API
  70. Scroll methods on elements (scroll, scrollTo, scrollBy)
  71. scrollIntoView
  72. Selection API
  73. Server Timing
  74. Server-sent events
  75. Service Workers
  76. Shared Web Workers
  77. Streams
  78. Synchronous Clipboard API
  79. TextEncoder & TextDecoder
  80. Touch events
  81. URL API
  82. URLSearchParams
  83. User Timing API
  84. Vibration API
  85. Web Animations API
  86. Web Audio API
  87. Web Cryptography
  88. Web MIDI API
  89. Web Notifications
  90. Web Share API
  91. Web Sockets
  92. Web Storage - name/value pairs
  93. Web Workers
  94. WebGPU
  95. WebRTC Peer-to-peer connections
  96. WebXR Device API
  97. XMLHttpRequest advanced features
  98. Background Sync API
  99. Cookie Store API
  100. Directory selection from file input
  101. document.evaluate & XPath
  102. Document.execCommand()
  103. Efficient Script Yielding: setImmediate()
  104. Element.scrollIntoViewIfNeeded()
  105. FIDO U2F API
  106. File System Access API
  107. Filesystem & FileWriter API
  108. IntersectionObserver V2
  109. Network Information API
  110. Permissions API
  111. Picture-in-Picture
  112. Resize Observer
  113. Speech Recognition API
  114. Speech Synthesis API
  115. Trusted Types for DOM manipulation
  116. Web Bluetooth
  117. Web NFC
  118. Web Serial API
  119. Web SQL Database
  120. WebHID API
  121. WebUSB
  122. WebVR API
  123. All JS API features