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ReactField

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Design system

Every ReactField content and learning component in one place, in each of its states, for visual QA. Not linked from the site.

Mohamed ElshahawyPublished Oct 2026
2 min read

What you'll learn

  • Callouts, summaries, deep dives and FAQs
  • Code blocks, code groups and before/after comparisons
  • Diagrams: grids, trees, phase flows and timelines
  • Learning components: checkpoints, predict-the-output, playground, takeaways, quiz and recap

This page renders every component ReactField uses so a change can be checked in one pass. It is excluded from the sidebar, search, and the sitemap, and is marked noindex. The spec lives in DESIGN.md.

Typography

Body copy is 17px Inter with a 1.75 line-height in a column of about 70 characters. Inline code uses JetBrains Mono, and links are underlined in the accent color. Bold marks the one idea a paragraph is about.

A third-level heading

A blockquote is for a single quoted idea or a definition worth pausing on.

  • Unordered lists keep a short rhythm
  • with one idea per item
    • and nest when needed
  1. Ordered lists are for steps
  2. that happen in sequence
TokenValueUse
cream#faf9f6Page background
paper#ffffffCards and panels
oat#dedbd6Borders and dividers
accent#ff5600Links, active state, progress

Callouts

Impact: faster first paint, lower JS parse cost

Disclosure

Details with the learn icon
Details with the resources icon

Code

A single code block:

JSX
function Greeting({ name }) {
  return <p>Hello, {name}</p>
}
Code group
export function add(a, b) {
  return a + b
}
Incorrect (new object each render)TSX
const style = { color: 'red' }
return <Child style={style} />
Correct (stable reference)TSX
const style = useMemo(() => ({ color: 'red' }), [])
return <Child style={style} />

Diagrams

Diagram grid

Default

Parent

Accent

Updated

Success

Skipped

Muted

Untouched

Commit Phase

Boxes come in default, accent, success and muted tones.
Tree diagram with highlighted and dimmed nodes
Parent
Child A
Child B
Child C
Phase flow
  1. 1

    State update

    setState schedules work

  2. 2

    Render Phase

    Calculate the next UI

  3. 3

    Commit Phase

    Apply DOM changes

  1. 2013React is releasedClient-side rendering
  2. 2017FiberIncremental rendering
  3. 2024React 19Actions and Server Components

Learning components

Key takeaway

A takeaway states one idea worth remembering. The recap at the end of the page collects every takeaway automatically.

Checkpoint

Which color is reserved for the accent?

Predict the output

What does this code log?

JavaScript
console.log(1)
setTimeout(() => console.log(3), 0)
console.log(2)
Loading the live editor…

A second takeaway

Every interactive question records the first answer to the reader's progress, so the sidebar and table of contents can show what has been completed.

Quiz

Sample quiz2 questionsQuestion 1 of 2

Which radius do cards use?

Recap

What to remember from this article

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