Design for AIMarkdown twins
Every snippet, style and frontier feature exists twice: as the page you are reading and as a plain markdown file at the same address with .md on the end. Agents read the markdown; people read the page. The machine-readable index is /llms.txt.
Buttons
btn-001 Ink flat
btn-002 Cobalt block
btn-003 Mint soft-flat
btn-004 Crimson wide
btn-005 Slate square
btn-006 Sunflower bold
btn-007 Violet text-lift
btn-008 Charcoal micro
btn-009 Hairline outline
btn-010 Bold outline fill
btn-011 Ghost text
btn-012 Dashed outline
btn-013 Double-line outline
btn-014 Ghost with border-on-hover
btn-015 Rose outline pill
btn-016 Inverted ghost (on dark)
btn-017 Classic pill
btn-018 Two-tone pill
btn-019 Pill with ring
btn-020 Squircle
btn-021 Pill shrink-on-press
btn-022 Capsule with dot
btn-023 Asymmetric radius
btn-024 Sunset gradient
btn-025 Aurora shift
btn-026 Gradient border
btn-027 Gradient text ghost
btn-028 Deep ocean
btn-029 Radial hotspot
btn-030 Mesh pastel
btn-031 Metallic gold
btn-032 Frosted glass pill
btn-033 Dark glass
btn-034 Glass with glow edge
btn-035 Clear glass card button
btn-036 Glass segment tab
btn-037 Glass with inner light
btn-038 Soft clay raised
btn-039 Soft pressed
btn-040 Soft circle icon
btn-041 Soft dark mode
btn-042 Soft pill accent
btn-043 Soft toggle chip
btn-044 Neo-brutal yellow
btn-045 Neo-brutal pink pill
btn-046 Brutalist mono
btn-047 Neo-brutal colour shadow
btn-048 Brutalist stripe
btn-049 Neo-brutal dark
btn-050 Brutalist tag
btn-051 Candy press
btn-052 Keycap
btn-053 Arcade red
btn-054 Tilt card press
btn-055 Stacked layers
btn-056 Bevel chrome
btn-057 Ember slide fill
btn-058 Rise fill
btn-059 Center bloom
btn-060 Diagonal wipe
btn-061 Split curtain
btn-062 Top-down shutter
btn-063 Corner sweep
btn-064 Text swap slide
btn-065 Underline grow
btn-066 Underline from centre
btn-067 Border trace
btn-068 Bracket reveal
btn-069 Double underline
btn-070 Highlighter swipe
btn-071 Sheen sweep dark
btn-072 Continuous shimmer
btn-073 Glossy top-light
btn-074 Light sweep outline
btn-075 Sheen on gold pill
btn-076 Arrow nudge
btn-077 Plus rotate
btn-078 Download drop
btn-079 Icon-only ghost square
btn-080 Icon box split
btn-081 Chevron reveal
btn-082 Ring spinner loading
btn-083 Three-dot loader
btn-084 Progress bar fill
btn-085 Pulse loading ghost
btn-086 Switch toggle (checkbox)
btn-087 Toggle pill (pressed state)
btn-088 Sliding tab toggle
btn-089 Split action
btn-090 Dual pair
btn-091 Split with counter
btn-092 Pixel 8-bit
btn-093 Terminal prompt
btn-094 CRT amber
btn-095 Win95 grey
btn-096 Midnight primary
btn-097 Midnight secondary
btn-098 Segmented three-way
btn-099 Joined button group
btn-100 Pill filter group
btn-101 Conic ring spin
btn-102 Conic wedge orbit
btn-103 Halo ring
btn-104 Dashed gradient march
btn-105 Highlight sweep
btn-106 Neon pulse cyan
btn-107 Magenta heartbeat
btn-108 Lime tube flicker
btn-109 Ember breathing
btn-110 Ghost glow edge
btn-111 Blob morph
btn-112 Liquid pill wobble
btn-113 Lava lamp interior
btn-114 Droplet corner
btn-115 Squircle squeeze
btn-116 Vertical text swap
btn-117 Cube face flip
btn-118 Tracking reveal
btn-119 Strike and replace
btn-120 Typewriter erase
btn-121 Tilt card lift
btn-122 Magnetic pull
btn-123 Parallax layers
btn-124 Pendulum swing
btn-125 Skew lean
btn-126 Brushed metal
btn-127 Leather stitch
btn-128 Embossed paper
btn-129 Glass dome key
btn-130 Pressed dial
btn-131 Clay bubble
btn-132 Clay peach
btn-133 Clay mint icon
btn-134 Clay lavender wide
btn-135 Clay dark mode
btn-136 Aurora drift
btn-137 Mesh sunrise
btn-138 Northern lights bar
btn-139 Holographic foil
btn-140 Aurora outline text
btn-141 Glitch slice
btn-142 Chamfered corners
btn-143 Scanline sweep
btn-144 Notched tag
btn-145 RGB split hover
btn-146 Inset fill sweep
btn-147 Inset fill vertical
btn-148 Inset fill centre
btn-149 Inset fill diagonal duo
btn-150 Inset fill ring pop
btn-151 Corner brackets
btn-152 Four-corner ticks
btn-153 Bracket text wrap
btn-154 Corner dot markers
btn-155 Angle brackets arrow
btn-156 Sticker tilt
btn-157 Price tag hole
btn-158 Stamp badge
btn-159 Ribbon corner
btn-160 Puffy sticker outline
btn-161 Chip close soft
btn-162 Chip close outline
btn-163 Chip selectable check
btn-164 Chip with count and close
btn-165 Chip avatar close
btn-166 FAB classic
btn-167 FAB extended
btn-168 FAB rotating plus
btn-169 FAB squircle gradient
btn-170 FAB mini stack
btn-171 Arrow link slide
btn-172 Arrow swap in
btn-173 Arrow circle grow
btn-174 Arrow long line
btn-175 Arrow bounce
btn-176 Sparkle AI gradient
btn-177 Sparkle AI outline
btn-178 Sparkle orbit
btn-179 Sparkle shimmer text
btn-180 Sparkle magic wand
btn-181 Hold-to-confirm fill
btn-182 Progress stripe static
btn-183 Progress ring conic
btn-184 Indeterminate stripes
btn-185 Countdown drain
btn-186 Share pill icon
btn-187 Copy link feedback
btn-188 Share row split
btn-189 Share fan-out hover
btn-190 Share count pill
btn-191 CTA banner subtitle
btn-192 CTA banner arrow end
btn-193 CTA banner gradient
btn-194 CTA banner icon left
btn-195 Micro pill
btn-196 Micro kbd
btn-197 Micro icon square
btn-198 color-mix tint scale
btn-199 light-dark auto theme
btn-200 corner-shape squircle
btn-002 Cobalt block
btn-003 Mint soft-flat
btn-004 Crimson wide
btn-005 Slate square
btn-006 Sunflower bold
btn-007 Violet text-lift
btn-008 Charcoal micro
btn-009 Hairline outline
btn-010 Bold outline fill
btn-011 Ghost text
btn-012 Dashed outline
btn-013 Double-line outline
btn-014 Ghost with border-on-hover
btn-015 Rose outline pill
btn-016 Inverted ghost (on dark)
btn-017 Classic pill
btn-018 Two-tone pill
btn-019 Pill with ring
btn-020 Squircle
btn-021 Pill shrink-on-press
btn-022 Capsule with dot
btn-023 Asymmetric radius
btn-024 Sunset gradient
btn-025 Aurora shift
btn-026 Gradient border
btn-027 Gradient text ghost
btn-028 Deep ocean
btn-029 Radial hotspot
btn-030 Mesh pastel
btn-031 Metallic gold
btn-032 Frosted glass pill
btn-033 Dark glass
btn-034 Glass with glow edge
btn-035 Clear glass card button
btn-036 Glass segment tab
btn-037 Glass with inner light
btn-038 Soft clay raised
btn-039 Soft pressed
btn-040 Soft circle icon
btn-041 Soft dark mode
btn-042 Soft pill accent
btn-043 Soft toggle chip
btn-044 Neo-brutal yellow
btn-045 Neo-brutal pink pill
btn-046 Brutalist mono
btn-047 Neo-brutal colour shadow
btn-048 Brutalist stripe
btn-049 Neo-brutal dark
btn-050 Brutalist tag
btn-051 Candy press
btn-052 Keycap
btn-053 Arcade red
btn-054 Tilt card press
btn-055 Stacked layers
btn-056 Bevel chrome
btn-057 Ember slide fill
btn-058 Rise fill
btn-059 Center bloom
btn-060 Diagonal wipe
btn-061 Split curtain
btn-062 Top-down shutter
btn-063 Corner sweep
btn-064 Text swap slide
btn-065 Underline grow
btn-066 Underline from centre
btn-067 Border trace
btn-068 Bracket reveal
btn-069 Double underline
btn-070 Highlighter swipe
btn-071 Sheen sweep dark
btn-072 Continuous shimmer
btn-073 Glossy top-light
btn-074 Light sweep outline
btn-075 Sheen on gold pill
btn-076 Arrow nudge
btn-077 Plus rotate
btn-078 Download drop
btn-079 Icon-only ghost square
btn-080 Icon box split
btn-081 Chevron reveal
btn-082 Ring spinner loading
btn-083 Three-dot loader
btn-084 Progress bar fill
btn-085 Pulse loading ghost
btn-086 Switch toggle (checkbox)
btn-087 Toggle pill (pressed state)
btn-088 Sliding tab toggle
btn-089 Split action
btn-090 Dual pair
btn-091 Split with counter
btn-092 Pixel 8-bit
btn-093 Terminal prompt
btn-094 CRT amber
btn-095 Win95 grey
btn-096 Midnight primary
btn-097 Midnight secondary
btn-098 Segmented three-way
btn-099 Joined button group
btn-100 Pill filter group
btn-101 Conic ring spin
btn-102 Conic wedge orbit
btn-103 Halo ring
btn-104 Dashed gradient march
btn-105 Highlight sweep
btn-106 Neon pulse cyan
btn-107 Magenta heartbeat
btn-108 Lime tube flicker
btn-109 Ember breathing
btn-110 Ghost glow edge
btn-111 Blob morph
btn-112 Liquid pill wobble
btn-113 Lava lamp interior
btn-114 Droplet corner
btn-115 Squircle squeeze
btn-116 Vertical text swap
btn-117 Cube face flip
btn-118 Tracking reveal
btn-119 Strike and replace
btn-120 Typewriter erase
btn-121 Tilt card lift
btn-122 Magnetic pull
btn-123 Parallax layers
btn-124 Pendulum swing
btn-125 Skew lean
btn-126 Brushed metal
btn-127 Leather stitch
btn-128 Embossed paper
btn-129 Glass dome key
btn-130 Pressed dial
btn-131 Clay bubble
btn-132 Clay peach
btn-133 Clay mint icon
btn-134 Clay lavender wide
btn-135 Clay dark mode
btn-136 Aurora drift
btn-137 Mesh sunrise
btn-138 Northern lights bar
btn-139 Holographic foil
btn-140 Aurora outline text
btn-141 Glitch slice
btn-142 Chamfered corners
btn-143 Scanline sweep
btn-144 Notched tag
btn-145 RGB split hover
btn-146 Inset fill sweep
btn-147 Inset fill vertical
btn-148 Inset fill centre
btn-149 Inset fill diagonal duo
btn-150 Inset fill ring pop
btn-151 Corner brackets
btn-152 Four-corner ticks
btn-153 Bracket text wrap
btn-154 Corner dot markers
btn-155 Angle brackets arrow
btn-156 Sticker tilt
btn-157 Price tag hole
btn-158 Stamp badge
btn-159 Ribbon corner
btn-160 Puffy sticker outline
btn-161 Chip close soft
btn-162 Chip close outline
btn-163 Chip selectable check
btn-164 Chip with count and close
btn-165 Chip avatar close
btn-166 FAB classic
btn-167 FAB extended
btn-168 FAB rotating plus
btn-169 FAB squircle gradient
btn-170 FAB mini stack
btn-171 Arrow link slide
btn-172 Arrow swap in
btn-173 Arrow circle grow
btn-174 Arrow long line
btn-175 Arrow bounce
btn-176 Sparkle AI gradient
btn-177 Sparkle AI outline
btn-178 Sparkle orbit
btn-179 Sparkle shimmer text
btn-180 Sparkle magic wand
btn-181 Hold-to-confirm fill
btn-182 Progress stripe static
btn-183 Progress ring conic
btn-184 Indeterminate stripes
btn-185 Countdown drain
btn-186 Share pill icon
btn-187 Copy link feedback
btn-188 Share row split
btn-189 Share fan-out hover
btn-190 Share count pill
btn-191 CTA banner subtitle
btn-192 CTA banner arrow end
btn-193 CTA banner gradient
btn-194 CTA banner icon left
btn-195 Micro pill
btn-196 Micro kbd
btn-197 Micro icon square
btn-198 color-mix tint scale
btn-199 light-dark auto theme
btn-200 corner-shape squircle
Cards
card-001 Quiet content
card-002 Tagged photo
card-003 Bottom fade image
card-004 Soft shadow footer
card-005 Hover zoom image
card-006 Media left row
card-007 Thumbnail row
card-008 Dark accent bar
card-009 Media right
card-010 Centered avatar
card-011 Banner stats profile
card-012 Team member row
card-013 Status dot profile
card-014 Square avatar ID
card-015 Classic pricing
card-016 Featured pro tier
card-017 Line pricing
card-018 Tiered divider
card-019 Per seat pricing
card-020 Badge add to cart
card-021 Slide-up add
card-022 Rating swatches
card-023 Discount ribbon
card-024 Cart line
card-025 Big quote mark
card-026 Dark stars quote
card-027 Accent bar quote
card-028 Frosted glass
card-029 Night glass blobs
card-030 Soft embossed
card-031 Dark embossed stat
card-032 Hard shadow brutal
card-033 Sticker tag poster
card-034 Spinning conic edge
card-035 Clipped gradient border
card-036 Tinted glow lift
card-037 Perspective tilt
card-038 Hover flip
card-039 Tap to flip
card-040 Sliding caption
card-041 Darken overlay
card-042 Bento stat tiles
card-043 Dotted bento tile
card-044 Success toast
card-045 Countdown error toast
card-046 Release timeline
card-047 Step wizard
card-048 System theme aware
card-049 Light dark colors
card-050 Shimmer skeleton
card-051 Pulse skeleton row
card-052 File download
card-053 Upload dropzone
card-054 Link preview
card-055 Favicon link chip
card-056 Big date
card-057 Time strip
card-058 Music player
card-059 Equalizer now playing
card-060 Delta pill
card-061 Sparkline stat
card-062 Progress ring stat
card-063 Icon tile feature
card-064 Gradient icon
card-065 Author meta blog
card-066 Editorial essay row
card-067 Enterprise two column
card-068 Gradient ring skills
card-069 Container query stack
card-070 Tick to select
card-071 Radio plan picker
card-072 Subgrid aligned row
card-073 Squircle corners
card-074 Bevel ticket
card-075 Notched boarding pass
card-076 Dashed coupon code
card-077 Social post
card-078 Nested comment thread
card-079 Chat bubbles
card-080 Weather widget
card-081 Recipe chips
card-082 Job listing
card-083 Course progress
card-084 Ticked task
card-085 Sticky note
card-086 Polaroid frame
card-087 Glossy payment
card-088 Fanned deck
card-089 Corner spotlight
card-090 Drifting gradient
card-091 Paper grain noise
card-092 Neon tube edge
card-093 Add new placeholder
card-094 Logo mini quote
card-095 Version changelog
card-096 Before after metrics
card-097 App store row
card-098 Play thumbnail
card-099 Map pin address
card-100 Newsletter signup
card-002 Tagged photo
card-003 Bottom fade image
card-004 Soft shadow footer
card-005 Hover zoom image
card-006 Media left row
card-007 Thumbnail row
card-008 Dark accent bar
card-009 Media right
card-010 Centered avatar
card-011 Banner stats profile
card-012 Team member row
card-013 Status dot profile
card-014 Square avatar ID
card-015 Classic pricing
card-016 Featured pro tier
card-017 Line pricing
card-018 Tiered divider
card-019 Per seat pricing
card-020 Badge add to cart
card-021 Slide-up add
card-022 Rating swatches
card-023 Discount ribbon
card-024 Cart line
card-025 Big quote mark
card-026 Dark stars quote
card-027 Accent bar quote
card-028 Frosted glass
card-029 Night glass blobs
card-030 Soft embossed
card-031 Dark embossed stat
card-032 Hard shadow brutal
card-033 Sticker tag poster
card-034 Spinning conic edge
card-035 Clipped gradient border
card-036 Tinted glow lift
card-037 Perspective tilt
card-038 Hover flip
card-039 Tap to flip
card-040 Sliding caption
card-041 Darken overlay
card-042 Bento stat tiles
card-043 Dotted bento tile
card-044 Success toast
card-045 Countdown error toast
card-046 Release timeline
card-047 Step wizard
card-048 System theme aware
card-049 Light dark colors
card-050 Shimmer skeleton
card-051 Pulse skeleton row
card-052 File download
card-053 Upload dropzone
card-054 Link preview
card-055 Favicon link chip
card-056 Big date
card-057 Time strip
card-058 Music player
card-059 Equalizer now playing
card-060 Delta pill
card-061 Sparkline stat
card-062 Progress ring stat
card-063 Icon tile feature
card-064 Gradient icon
card-065 Author meta blog
card-066 Editorial essay row
card-067 Enterprise two column
card-068 Gradient ring skills
card-069 Container query stack
card-070 Tick to select
card-071 Radio plan picker
card-072 Subgrid aligned row
card-073 Squircle corners
card-074 Bevel ticket
card-075 Notched boarding pass
card-076 Dashed coupon code
card-077 Social post
card-078 Nested comment thread
card-079 Chat bubbles
card-080 Weather widget
card-081 Recipe chips
card-082 Job listing
card-083 Course progress
card-084 Ticked task
card-085 Sticky note
card-086 Polaroid frame
card-087 Glossy payment
card-088 Fanned deck
card-089 Corner spotlight
card-090 Drifting gradient
card-091 Paper grain noise
card-092 Neon tube edge
card-093 Add new placeholder
card-094 Logo mini quote
card-095 Version changelog
card-096 Before after metrics
card-097 App store row
card-098 Play thumbnail
card-099 Map pin address
card-100 Newsletter signup
Styles
Glassmorphism
Liquid glass
Neumorphism
Claymorphism
Neo-brutalism
Classic brutalism
Swiss / International Typographic Style
Editorial / magazine
Minimalism
Maximalism
Bento grid
Midnight SaaS
Terminal / hacker
Retro pixel / 8-bit
Y2K / Frutiger Aero
Vaporwave
Cyberpunk / neon
Memphis
Bauhaus
Art Deco
Flat 2.0
Material 3 Expressive
Skeuomorphism
Paper / notebook
Cream-paper warm minimal
Corporate Memphis (illustration style)
Monochrome black and white
High-contrast accessibility
Pastel soft UI
Gradient mesh / aurora
Glass + noise grain
Hand-drawn / sketch
Zine / collage
Japanese minimal (ma)
Scandinavian
Industrial / blueprint / engineering
Luxury / fashion serif
Playful rounded (Duolingo-like)
Kids / storybook
Retro-futurism
Sci-fi HUD
Organic / blob shapes
Typographic-only
Photography-led
Kinetic / motion-first
E-ink / low-contrast calm
Dashboard / data-dense
Government / institutional clean
Neo-grotesque tech
AI startup gradient glow (the default slop look)
Liquid glass
Neumorphism
Claymorphism
Neo-brutalism
Classic brutalism
Swiss / International Typographic Style
Editorial / magazine
Minimalism
Maximalism
Bento grid
Midnight SaaS
Terminal / hacker
Retro pixel / 8-bit
Y2K / Frutiger Aero
Vaporwave
Cyberpunk / neon
Memphis
Bauhaus
Art Deco
Flat 2.0
Material 3 Expressive
Skeuomorphism
Paper / notebook
Cream-paper warm minimal
Corporate Memphis (illustration style)
Monochrome black and white
High-contrast accessibility
Pastel soft UI
Gradient mesh / aurora
Glass + noise grain
Hand-drawn / sketch
Zine / collage
Japanese minimal (ma)
Scandinavian
Industrial / blueprint / engineering
Luxury / fashion serif
Playful rounded (Duolingo-like)
Kids / storybook
Retro-futurism
Sci-fi HUD
Organic / blob shapes
Typographic-only
Photography-led
Kinetic / motion-first
E-ink / low-contrast calm
Dashboard / data-dense
Government / institutional clean
Neo-grotesque tech
AI startup gradient glow (the default slop look)
New in CSS
Container queries (size) + cqi/cqw units
:has() relational selector
CSS nesting
Cascade layers (@layer)
Subgrid
color-mix()
oklch() / oklab() colors
Relative color syntax (from)
light-dark()
@property (registered custom properties)
text-wrap: balance
Popover attribute + ::backdrop
<dialog> improvements (closedby, :modal, requestClose)
@starting-style + transition-behavior: allow-discrete
inert attribute
:user-valid / :user-invalid
accent-color
Stepped value functions: round(), mod(), rem(), abs(), sign()
Trigonometric functions: sin(), cos(), tan(), atan2()
animation-composition
offset-path with shapes (motion path)
CSS masking (mask, mask-image, mask-composite) unprefixed
backdrop-filter
scrollbar-gutter, scrollbar-width, scrollbar-color
Exclusive accordions (details name=) + ::details-content
Custom Highlight API (::highlight()) + ::target-text
View transitions, same document (document.startViewTransition)
:open pseudo-class
Container style queries (custom properties)
@scope
field-sizing: content
contrast-color()
shape() for clip-path / offset-path
sibling-index() and sibling-count()
text-box-trim / text-box-edge (text-box shorthand)
Anchor positioning: anchor(), position-area, position-try
Name-only container queries + comma-separated queries
lh / rlh units (and rcap, rch, rex, ric)
Scroll-driven animations (animation-timeline: scroll() / view())
Cross-document view transitions (@view-transition)
text-wrap: pretty
popover="hint"
dialog closedby="any" (light-dismiss dialogs)
color-mix() with many colors + light-dark() for images
margin-trim
Standard line-clamp (unprefixed) and -webkit-line-clamp
CSS Typed OM (CSSStyleValue, attributeStyleMap, CSS.px)
revert-rule keyword
interpolate-size / calc-size() (animate to height:auto)
corner-shape (squircle, scoop, notch, bevel, superellipse())
CSS if() conditional function
@function custom functions
reading-flow / reading-order
CSS carousels: ::scroll-button(), ::scroll-marker(), ::scroll-marker-group
Scroll-state container queries (stuck, snapped, scrollable, scrolled)
text-fit (fit-to-width headlines)
background-clip: border-area (gradient borders)
Gap decorations (column-rule / row-rule in grid and flex)
random() and progress() functions
Grid Lanes (CSS-only masonry)
Customizable <select> (appearance: base-select, ::picker(select))
Typed attr() (attr(data-x type(<length>)))
:has() relational selector
CSS nesting
Cascade layers (@layer)
Subgrid
color-mix()
oklch() / oklab() colors
Relative color syntax (from)
light-dark()
@property (registered custom properties)
text-wrap: balance
Popover attribute + ::backdrop
<dialog> improvements (closedby, :modal, requestClose)
@starting-style + transition-behavior: allow-discrete
inert attribute
:user-valid / :user-invalid
accent-color
Stepped value functions: round(), mod(), rem(), abs(), sign()
Trigonometric functions: sin(), cos(), tan(), atan2()
animation-composition
offset-path with shapes (motion path)
CSS masking (mask, mask-image, mask-composite) unprefixed
backdrop-filter
scrollbar-gutter, scrollbar-width, scrollbar-color
Exclusive accordions (details name=) + ::details-content
Custom Highlight API (::highlight()) + ::target-text
View transitions, same document (document.startViewTransition)
:open pseudo-class
Container style queries (custom properties)
@scope
field-sizing: content
contrast-color()
shape() for clip-path / offset-path
sibling-index() and sibling-count()
text-box-trim / text-box-edge (text-box shorthand)
Anchor positioning: anchor(), position-area, position-try
Name-only container queries + comma-separated queries
lh / rlh units (and rcap, rch, rex, ric)
Scroll-driven animations (animation-timeline: scroll() / view())
Cross-document view transitions (@view-transition)
text-wrap: pretty
popover="hint"
dialog closedby="any" (light-dismiss dialogs)
color-mix() with many colors + light-dark() for images
margin-trim
Standard line-clamp (unprefixed) and -webkit-line-clamp
CSS Typed OM (CSSStyleValue, attributeStyleMap, CSS.px)
revert-rule keyword
interpolate-size / calc-size() (animate to height:auto)
corner-shape (squircle, scoop, notch, bevel, superellipse())
CSS if() conditional function
@function custom functions
reading-flow / reading-order
CSS carousels: ::scroll-button(), ::scroll-marker(), ::scroll-marker-group
Scroll-state container queries (stuck, snapped, scrollable, scrolled)
text-fit (fit-to-width headlines)
background-clip: border-area (gradient borders)
Gap decorations (column-rule / row-rule in grid and flex)
random() and progress() functions
Grid Lanes (CSS-only masonry)
Customizable <select> (appearance: base-select, ::picker(select))
Typed attr() (attr(data-x type(<length>)))