AntoninJanuska

Pattern library

UI Patterns

A UI pattern library built for coding agents. 40 patterns, each shipping a copy-paste prompt that rebuilds it inside your own codebase — plus a live preview and the source behind it.

Every pattern, three ways

Three layers per pattern

Preview sits on top, the source beneath it, and the prompt at the bottom holding it all up.

z 0

Preview

The pattern running live in an isolated frame, in whichever theme you are reading in.

z −1

Source

Its markup, styles and behaviour, plus a single runnable file carrying its own palette.

z −2

Prompt

A written spec that rebuilds the pattern from scratch — including why each decision is the way it is. Paste it into Claude Code, Cursor, or any coding agent.

The prompts are the point. Each one is written to survive being handed to an agent with no other context: it names the surfaces the pattern belongs on, spells out the constraint that makes it work, and calls out the failure it exists to prevent. Nothing here is a dependency you install.

All patterns

Data displayAdded Aug 11, 2026

Windowed schedule grid

Rows of resources against a fixed time window, where each block is sized by its overlap with the window rather than by its own duration.

  • schedule
  • timeline
  • grid
  • flexbox
Data displayAdded Aug 11, 2026

Benchmark progress bar

Places a raw figure on a scale of external benchmarks instead of printing it plain.

  • progress
  • benchmarks
  • css-only
  • data-viz
Data displayAdded Aug 11, 2026

Cross-highlight matrix

A two-axis lookup table with both headers sticky, hover lighting the full row and column at once, and a durable click-to-pin selection for touch.

  • table
  • matrix
  • sticky
  • accessibility
Data displayAdded Aug 11, 2026

Left-truncating paths

Shortens a long path by dropping whole segments from the left, because the tail is what tells two paths apart.

  • truncation
  • paths
  • text-overflow
  • breadcrumbs
Data displayUpdatedUpdated Sep 28, 2026

Shape-mark sequence

A sequence compressed into a row of small marks whose shape carries the state.

  • stepper
  • sparkline
  • series
  • truncation
Data displayAdded Aug 21, 2026

Linked month bars

A month-by-month volume timeline built from plain divs where every aggregate row links to the filtered view that produced it.

  • timeline
  • drill-down
  • css-only
  • data-viz
Data displayAdded Aug 21, 2026

Glass vial meter

A vertical potion-vial meter whose liquid fills a wide bulb first and then rises into a narrow neck — all CSS, no images.

  • meter
  • skeuomorphic
  • css-only
  • reduced-motion
Data displayAdded Sep 12, 2026

Partitioned stage bar

Progress for work with several possible endings, drawn as a census rather than a fraction.

  • progress
  • stacked-bar
  • batch
  • legend
Data displayAdded Sep 12, 2026

Term-by-term derivation

A computed figure shown with the audit trail behind it — the number is the product and the derivation is the receipt.

  • explainability
  • calculator
  • disclosure
  • formula
Data displayUpdatedUpdated Sep 28, 2026

Plan preview tree

A dry run shown as a before-and-after tree with counts now, after, and the difference.

  • dry-run
  • diff
  • tree
  • preview
Data displayAdded Sep 12, 2026

Uniform slot shell

One card shell many independent sources render through, where the shell does the capping.

  • dashboard
  • widgets
  • cards
  • empty-state
LayoutUpdatedUpdated Sep 28, 2026

Object-shaped cards

Where a record stands for a physical thing, the card is drawn as that thing — nine variations in pure gradients.

  • cards
  • css-only
  • gradients
  • variations
LayoutAdded Aug 11, 2026

Adaptive tile mosaic

A container with no artwork draws one from up to four member tiles, grid tracks following tile count.

  • css-grid
  • css-only
  • no-assets
  • cards
LayoutUpdatedUpdated Sep 28, 2026

Ground-scrimmed artwork

Text printed over unreviewed artwork, scrimmed to an alpha that can be written down rather than guessed.

  • layout
  • css-only
  • gradients
  • contrast
LayoutUpdatedUpdated Sep 28, 2026

Hairline stat strip

Stat tiles joined by hairlines that are grid gap, not borders.

  • stats
  • css-grid
  • css-only
  • hairline
LayoutAdded Aug 21, 2026

Annotated transcript

Conversation bubbles with a speaker-colored spine and a fixed metadata gutter.

  • conversation
  • gutter
  • status-roles
  • contrast
LayoutAdded Aug 21, 2026

Cork notice board

Pinned paper notes on a cork board where every texture is layered CSS gradients.

  • skeuomorphic
  • gradients
  • no-assets
  • cards
LayoutUpdatedUpdated Sep 28, 2026

Hotspot marker layer

Markers at percentage coordinates over a fixed-aspect picture, turning into a list when too narrow.

  • hotspots
  • pointer-events
  • aspect-ratio
  • container-query
LayoutAdded Sep 12, 2026

Line-art empty states

Inline drawings for empty surfaces stroked in the inherited text colour.

  • empty-state
  • svg
  • currentcolor
  • illustration
LayoutAdded Sep 12, 2026

Column-flow wall

Cards flowing down columns instead of across rows, with the reading-order cost stated plainly.

  • masonry
  • columns
  • break-inside
  • reading-order
InteractionAdded Aug 11, 2026

Scroll edge shadows

An inset shadow shown only on the edge that has more content behind it.

  • scrolling
  • affordance
  • lists
  • overflow
InteractionAdded Aug 11, 2026

Frozen-batch deck

A one-card-at-a-time review queue whose batch is snapshotted at mount.

  • queue
  • review-flow
  • animation
  • keyboard
InteractionUpdatedUpdated Sep 28, 2026

Controls beside the anchor

Per-card controls over a fully-linked card without nesting interactive elements in the anchor.

  • cards
  • accessibility
  • keyboard
  • focus-within
InteractionUpdatedUpdated Sep 28, 2026

Pluggable canvas visualizer

One canvas, a registry of draw modes, each mode owning its entire frame.

  • canvas
  • visualization
  • registry
  • animation
InteractionUpdatedUpdated Sep 28, 2026

Roving-grid board

A dense grid of state cells that is one tab stop with arrow-key navigation.

  • keyboard
  • roving-tabindex
  • accessibility
  • states
InteractionAdded Aug 21, 2026

Section rail

Sticky vertical rail on wide screens, wrapping tab row on narrow ones, from the same markup.

  • navigation
  • toc
  • responsive
  • aria-current
InteractionAdded Aug 21, 2026

Ledge-press buttons

Buttons on a solid ledge shadow that travel down onto it when pressed.

  • buttons
  • skeuomorphic
  • press
  • tokens
InteractionUpdatedUpdated Sep 28, 2026

Guarded control

A blocked control stays focusable, carries the reason as text, and refuses in its handler.

  • aria-disabled
  • disabled
  • preconditions
  • keyboard
InteractionUpdatedUpdated Sep 28, 2026

Polled job card

One card for every state a background job passes through.

  • progress
  • polling
  • background-job
  • indeterminate
InteractionAdded Sep 12, 2026

Entry-transform motion

FLIP-style motion between two rendered states when the old DOM is already gone.

  • animation
  • transitions
  • reflow
  • reduced-motion
InteractionUpdatedUpdated Sep 28, 2026

Slot-first picker

Assignment that starts at the destination slot, then narrows the catalogue.

  • assignment
  • picker
  • aria-pressed
  • filtering
FormsAdded Aug 28, 2026

Undo toast

A destructive action with no confirm dialog, held behind a toast and committed when it expires.

  • undo
  • toast
  • destructive
  • aria-live
FormsNewAdded Sep 28, 2026

Blast-radius confirm

A confirm dialog that names everything a delete cascades and blocks dismissal while it runs.

  • confirm-dialog
  • destructive
  • cascade
  • dialog-element
FormsUpdatedUpdated Sep 28, 2026

Batch action bar

A bar that exists only while something is selected, states the count in words, caps at five actions.

  • selection
  • bulk-actions
  • toolbar
  • checkbox
FormsAdded Sep 12, 2026

Filtered to zero

The three empty states a list actually has, written as three different screens.

  • empty-state
  • filter
  • search
  • zero-results
FormsAdded Sep 12, 2026

Parsed query chips

A search box that echoes back how it read the text as removable chips.

  • search
  • query-syntax
  • chips
  • facets
FormsAdded Sep 12, 2026

Compound-value picker

One grouped select whose value carries both the kind and the id.

  • select
  • optgroup
  • polymorphic
  • forms
ColorUpdatedUpdated Sep 28, 2026

Ground-referenced color

Colors solved against the page's own ground token so they invert correctly between themes.

  • color
  • contrast
  • color-mix
  • accessibility
ColorUpdatedUpdated Sep 28, 2026

Single-property color variants

One custom property carries the hue; border, fill, spine and dot derive from it.

  • color
  • color-mix
  • custom-properties
  • theming
ColorUpdatedUpdated Sep 28, 2026

Controls on an unknown fill

Opaque controls, a gradient-darkened fill, and a two-tone focus ring on a surface whose colour arrives from outside.

  • contrast
  • brand-color
  • focus-ring
  • opacity