UI/UX Component Library
The largest Part of the handbook. Every commonly used interface component gets its own chapter, each following a compact, consistent structure: definition, anatomy/states, common mistakes, best practices, and a real-world example. These chapters are deliberately shorter than Parts I–II — components are meant to be looked up individually, not read as an essay — but every entry is still complete and actionable on its own.
Start Part III — 3.1Navigation Systems
The map a user builds of the whole product before they've used any of it.
3.2Mega Menus
A navigation escape hatch for products with too much structure for a normal dropdown.
3.3Sidebars
Persistent structure for products with enough depth that top navigation alone can't hold it.
3.4Breadcrumbs
A quiet but load-bearing answer to "where am I, and how do I get back up a level."
3.5Hero Sections
The first three seconds of a page's argument, compressed into one screen.
3.6Footers
Where the links that don't fit anywhere else quietly accumulate — for better or worse.
3.7Buttons
The smallest component in the library and the one users touch more than any other.
3.8Forms & Input Validation
Where the most user frustration per square inch of interface tends to concentrate.
3.9Cards
A self-contained unit for previewing something bigger — an article, a product, a record.
3.10Accordions
Progressive disclosure for content that's useful but shouldn't dominate the page by default.
3.11Tabs
Switching between mutually exclusive views without leaving the page.
3.12Data Tables
The densest, most information-critical component in most internal and admin products.
3.13Charts & Graphs
Turning numbers into a shape the eye can compare faster than a table of digits.
3.14Dashboard Layout Patterns
Composing many small components into one legible summary screen.
3.15Calendars
Compressing an abstract concept — time — into a scannable grid.
3.16Timelines
Sequence made visible — what happened, in what order, and what's next.
3.17Pricing Sections
Where a visitor decides, in seconds, whether the product is for them.
3.18Testimonials
Borrowed trust — someone else's word standing in for a track record the visitor hasn't seen yet.
3.19FAQ Sections
Pre-answering the objections that would otherwise become support tickets or lost conversions.
3.20Carousels
Popular, frequently misused, and worth thinking twice about before reaching for.
3.21Search
Often the fastest path through a product's structure — when it actually works.
3.22Filters
Letting the user narrow a large set down to exactly what matters to them.
3.23Notifications & Toasts
Brief, timely interruption — done right, it informs; done wrong, it becomes noise the user learns to ignore.
3.24Skeleton Loaders & Loading States
Managing the gap between "requested" and "ready" without it feeling like nothing is happening.
3.25Progress Indicators
Turning an unknown wait into a bounded, understandable one.
3.26Floating Action Buttons
A persistent shortcut to a product's single most common action.
3.27Modals & Dialogs
The most overused component in modern UI — powerful when it interrupts for a reason, damaging when it interrupts from habit.
3.28Drawers
A modal's gentler cousin — interrupting less while still focusing attention.
3.29Image Galleries
Letting visual content be the primary content, not a decorative afterthought.
3.30Maps
Spatial data deserves a spatial interface — but only when location is actually the point.
3.31Chat Widgets
A persistent, low-commitment channel to support or sales — if it doesn't get in the way.
3.32Dark Mode
More than an inverted color palette — a second, fully considered design system.
3.33Accessibility Foundations
Not a checklist bolted on at the end — a requirement that shapes every other chapter in this Part.
3.34Responsive Design
One layout, many screens — designed as a continuum rather than a fixed set of breakpoints.
3.35Animations & Transitions
Motion that explains a change in state — not motion for its own sake.
3.36Micro-interactions
The small, often unnoticed feedback loops that make an interface feel alive and responsive.
3.37Design Systems
The rulebook that keeps every component in this Part consistent across an entire product.
3.38Component Libraries
Where a design system's rules become actual, reusable code.