Index

CSS

  1. ::first-letter CSS pseudo-element selector
  2. ::placeholder CSS pseudo-element
  3. ::selection CSS pseudo-element
  4. :dir() CSS pseudo-class
  5. :has() CSS relational pseudo-class
  6. :in-range and :out-of-range CSS pseudo-classes
  7. :is() CSS pseudo-class
  8. :placeholder-shown CSS pseudo-class
  9. @font-face Web fonts
  10. Blending of HTML/SVG elements
  11. calc() as CSS unit value
  12. Case-insensitive CSS attribute selectors
  13. ch (character) unit
  14. CSS 2.1 selectors
  15. CSS ::marker pseudo-element
  16. CSS :any-link selector
  17. CSS :read-only and :read-write selectors
  18. CSS all property
  19. CSS Animation
  20. CSS Appearance
  21. CSS background-attachment
  22. CSS background-blend-mode
  23. CSS background-position edge offsets
  24. CSS background-repeat round and space
  25. CSS box-decoration-break
  26. CSS caret-color
  27. CSS Cascade Layers
  28. CSS clip-path property (for HTML)
  29. CSS color() function
  30. CSS color-adjust
  31. CSS Conical Gradients
  32. CSS Containment
  33. CSS content-visibility
  34. CSS Counter Styles
  35. CSS Counters
  36. CSS Cross-Fade Function
  37. CSS currentColor value
  38. CSS Device Adaptation
  39. CSS display: contents
  40. CSS element() function
  41. CSS Exclusions Level 1
  42. CSS Feature Queries
  43. CSS Filter Effects
  44. CSS filter() function
  45. CSS first-line pseudo-element
  46. CSS Flexible Box Layout Module
  47. CSS Font Loading
  48. CSS font-display
  49. CSS font-feature-settings
  50. CSS font-size-adjust
  51. CSS font-stretch
  52. CSS font-variant-alternates
  53. CSS font-variant-numeric
  54. CSS Generated content for pseudo-elements
  55. CSS grab & grabbing cursors
  56. CSS Gradients
  57. CSS Grid Layout (level 1)
  58. CSS hanging-punctuation
  59. CSS Hyphenation
  60. CSS image-set
  61. CSS Initial Letter
  62. CSS initial value
  63. CSS inline-block
  64. CSS justify-content: space-evenly
  65. CSS line-clamp
  66. CSS Logical Properties
  67. CSS Masks
  68. CSS math functions min(), max() and clamp()
  69. CSS min/max-width/height
  70. CSS Motion Path
  71. CSS namespaces
  72. CSS outline properties
  73. CSS overflow property
  74. CSS overflow-anchor (Scroll Anchoring)
  75. CSS page-break properties
  76. CSS Paint API
  77. CSS position:fixed
  78. CSS position:sticky
  79. CSS Regions
  80. CSS Repeating Gradients
  81. CSS resize property
  82. CSS revert value
  83. CSS Scroll Snap
  84. CSS Shapes Level 1
  85. CSS Subgrid
  86. CSS Table display
  87. CSS text-indent
  88. CSS text-justify
  89. CSS text-orientation
  90. CSS touch-action property
  91. CSS unset value
  92. CSS user-select: none
  93. CSS Variables (Custom Properties)
  94. CSS widows & orphans
  95. CSS will-change property
  96. CSS writing-mode property
  97. CSS3 2D Transforms
  98. CSS3 3D Transforms
  99. CSS3 attr() function for all properties
  100. CSS3 Background-image options
  101. CSS3 Border images
  102. CSS3 Border-radius (rounded corners)
  103. CSS3 Box-shadow
  104. CSS3 Box-sizing
  105. CSS3 Colors
  106. CSS3 Cursors (original values)
  107. CSS3 Cursors: zoom-in & zoom-out
  108. CSS3 font-kerning
  109. CSS3 image-orientation
  110. CSS3 Media Queries
  111. CSS3 Multiple backgrounds
  112. CSS3 Multiple column layout
  113. CSS3 object-fit/object-position
  114. CSS3 Opacity
  115. CSS3 Overflow-wrap
  116. CSS3 selectors
  117. CSS3 tab-size
  118. CSS3 text-align-last
  119. CSS3 Text-overflow
  120. CSS3 Text-shadow
  121. CSS3 Transitions
  122. CSS3 word-break
  123. CSSOM Scroll-behavior
  124. display: flow-root
  125. display: run-in
  126. Font unicode-range subsetting
  127. gap property for Flexbox
  128. getComputedStyle
  129. Intrinsic & Extrinsic Sizing
  130. LCH and Lab color values
  131. letter-spacing CSS property
  132. Media Queries: interaction media features
  133. Media Queries: resolution feature
  134. prefers-color-scheme media query
  135. prefers-reduced-motion media query
  136. Rebeccapurple color
  137. rem (root em) units
  138. selector list argument of :not()
  139. SVG in CSS backgrounds
  140. system-ui value for font-family
  141. text-decoration styling
  142. text-emphasis styling
  143. TTF/OTF - TrueType and OpenType font support
  144. ui-serif, ui-sans-serif, ui-monospace and ui-rounded values for font-family
  145. Variable fonts
  146. Viewport units: vw, vh, vmin, vmax
  147. Window.devicePixelRatio
  148. #rrggbbaa hex color notation
  149. :default CSS pseudo-class
  150. :focus-visible CSS pseudo-class
  151. :focus-within CSS pseudo-class
  152. :indeterminate CSS pseudo-class
  153. :optional CSS pseudo-class
  154. Background-clip: text
  155. background-position-x & background-position-y
  156. Crisp edges/pixelated images
  157. CSS -webkit-user-drag property
  158. CSS @apply rule
  159. CSS @scroll-timeline
  160. CSS Backdrop Filter
  161. CSS Canvas Drawings
  162. CSS Container Queries
  163. CSS Environment Variables env()
  164. CSS font-smooth
  165. CSS overflow: overlay
  166. CSS overscroll-behavior
  167. CSS pointer-events (for HTML)
  168. CSS Reflections
  169. CSS scrollbar styling
  170. CSS text-size-adjust
  171. CSS text-stroke and text-fill
  172. CSS zoom
  173. Explicit descendant combinator >>
  174. High-quality kerning pairs & ligatures
  175. Large, Small, and Dynamic viewport units
  176. Scoped CSS
  177. selector list argument of :nth-child and :nth-last-child CSS pseudo-classes
  178. 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 form features
  34. HTML5 semantic elements
  35. indeterminate checkbox
  36. Inline SVG in HTML5
  37. input event
  38. input placeholder attribute
  39. inputmode attribute
  40. Lazy loading via attribute for images & iframes
  41. Link type "noreferrer"
  42. maxlength attribute for input and textarea elements
  43. meter element
  44. Minimum length attribute for input fields
  45. Multiple file selection
  46. naturalWidth & naturalHeight image properties
  47. Number input type
  48. OffscreenCanvas
  49. PageTransitionEvent
  50. Path2D
  51. Pattern attribute for input fields
  52. Picture element
  53. Ping attribute
  54. PNG favicons
  55. Printing Events
  56. progress element
  57. Range input type
  58. readonly attribute of input and textarea elements
  59. rel=noopener
  60. relList (DOMTokenList)
  61. Reversed attribute of ordered lists
  62. Ruby annotation
  63. sandbox attribute for iframes
  64. Search input type
  65. Selection controls for input & textarea
  66. Session history management
  67. Spellcheck attribute
  68. srcdoc attribute for iframes
  69. Srcset and sizes attributes
  70. Subresource Integrity
  71. SVG favicons
  72. tabindex global attribute
  73. Text API for Canvas
  74. Video element
  75. Video Tracks
  76. wbr (word break opportunity) element
  77. WebGL - 3D Canvas graphics
  78. WebGL 2.0
  79. Context menu item (menuitem element)
  80. Custom Elements (deprecated V0 spec)
  81. Offline web applications
  82. Portals
  83. seamless attribute for iframes
  84. 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. CSS Nesting
  12. CSS Paged Media (@page)
  13. Data URIs
  14. document.elementFromPoint()
  15. document.head
  16. document.scrollingElement
  17. DOM manipulation convenience methods
  18. DOMContentLoaded
  19. DOMMatrix
  20. Dynamic Adaptive Streaming over HTTP (MPEG-DASH)
  21. Element.closest()
  22. Element.insertAdjacentElement() & Element.insertAdjacentText()
  23. EventTarget.addEventListener()
  24. EventTarget.dispatchEvent
  25. FLAC audio format
  26. focusin & focusout events
  27. HEIF/ISO Base Media File Format
  28. HEVC/H.265 video format
  29. HTMLElement.innerText
  30. HTTP/2 protocol
  31. HTTP/3 protocol
  32. JPEG 2000 image format
  33. JPEG XL image format
  34. JPEG XR image format
  35. KeyboardEvent.code
  36. KeyboardEvent.getModifierState()
  37. KeyboardEvent.key
  38. KeyboardEvent.location
  39. MathML
  40. Media Fragments
  41. MP3 audio format
  42. MPEG-4/H.264 video format
  43. Mutation events
  44. Node.compareDocumentPosition()
  45. Node.textContent
  46. Ogg Vorbis audio format
  47. Ogg/Theora video format
  48. Opus
  49. Passive event listeners
  50. PNG alpha transparency
  51. querySelector/querySelectorAll
  52. Resource Hints: dns-prefetch
  53. Resource Hints: modulepreload
  54. Resource Hints: preconnect
  55. Resource Hints: prefetch
  56. Resource Hints: preload
  57. Resource Hints: prerender
  58. SDCH Accept-Encoding/Content-Encoding
  59. Shadow DOM (V1)
  60. Signed HTTP Exchanges (SXG)
  61. theme-color Meta Tag
  62. WAI-ARIA Accessibility features
  63. Wav audio format
  64. WebAssembly
  65. WebM video format
  66. WebVTT - Web Video Text Tracks
  67. WOFF - Web Open Font Format
  68. WOFF 2.0 - Web Open Font Format
  69. XHTML served as application/xhtml+xml
  70. Animated PNG (APNG)
  71. Document Policy
  72. EOT - Embedded OpenType fonts
  73. HTTP Live Streaming (HLS)
  74. KeyboardEvent.charCode
  75. KeyboardEvent.which
  76. Resource Hints: Lazyload
  77. Shadow DOM (deprecated V0 spec)
  78. SPDY protocol
  79. URL Scroll-To-Text Fragment
  80. WebP image format
  81. XHTML+SMIL animation
  82. 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. FIDO U2F API
  34. File API
  35. FileReader API
  36. FileReaderSync
  37. Full Screen API
  38. Gamepad API
  39. Geolocation
  40. getUserMedia/Stream API
  41. Gyroscope
  42. High Resolution Time API
  43. IndexedDB
  44. IndexedDB 2.0
  45. Input Method Editor API
  46. IntersectionObserver
  47. Magnetometer
  48. matches() DOM method
  49. matchMedia
  50. Media Capture from DOM Elements API
  51. Media Source Extensions
  52. MediaRecorder API
  53. Mutation Observer
  54. Navigation Timing API
  55. navigator.hardwareConcurrency
  56. Object RTC (ORTC) API for WebRTC
  57. Online/offline status
  58. Orientation Sensor
  59. Page Visibility
  60. Payment Request API
  61. Permissions Policy
  62. Pointer events
  63. Pointer Lock API
  64. Proximity API
  65. Push API
  66. requestAnimationFrame
  67. requestIdleCallback
  68. Resource Timing
  69. Screen Orientation
  70. Screen Wake Lock API
  71. Scroll methods on elements (scroll, scrollTo, scrollBy)
  72. scrollIntoView
  73. Selection API
  74. Server Timing
  75. Server-sent events
  76. Service Workers
  77. Shared Web Workers
  78. Streams
  79. Synchronous Clipboard API
  80. TextEncoder & TextDecoder
  81. Touch events
  82. URL API
  83. URLSearchParams
  84. User Timing API
  85. Vibration API
  86. Web Animations API
  87. Web Audio API
  88. Web Cryptography
  89. Web MIDI API
  90. Web Notifications
  91. Web Share API
  92. Web Sockets
  93. Web Storage - name/value pairs
  94. Web Workers
  95. WebGPU
  96. WebRTC Peer-to-peer connections
  97. WebXR Device API
  98. XMLHttpRequest advanced features
  99. Background Sync API
  100. Cookie Store API
  101. Directory selection from file input
  102. document.evaluate & XPath
  103. Document.execCommand()
  104. Efficient Script Yielding: setImmediate()
  105. Element.scrollIntoViewIfNeeded()
  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