22 CSS Feature Sections17 / 22

Light JSMIT licensed

Feature Section with Code Preview Snippet

Three feature callouts on the left, a component-usage snippet on the right with a filename tab and a copy button. Syntax colour is hand-applied spans in a near-monochrome palette with one emerald accent, and the copy button feature-detects the clipboard so a blocked or insecure context gets a select-the-code fallback rather than a dead control.

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The code

<section class="fs-17" aria-labelledby="fs-17-heading">
  <div class="fs-17__hero" aria-hidden="true">
    <span class="fs-17__wordmark">Basalt UI</span>
    <span class="fs-17__heronav">components · primitives · themes</span>
  </div>

  <div class="fs-17__stage">
    <div class="fs-17__head">
      <p class="fs-17__eyebrow">Composition, not configuration</p>
      <h2 class="fs-17__heading" id="fs-17-heading">Primitives you own, styled with your tokens</h2>
    </div>

    <div class="fs-17__split">
      <ul class="fs-17__callouts">
        <li class="fs-17__callout">
          <span class="fs-17__icon" aria-hidden="true"><svg viewBox="0 0 24 24" width="17" height="17" fill="none" stroke="currentColor" stroke-width="1.8"><path d="M4 7h16M4 12h16M4 17h10"/></svg></span>
          <h3 class="fs-17__ctitle">Copied in, not installed</h3>
          <p class="fs-17__cprose">The component lands in your repository as source. Edit it, delete a prop, fork it — no wrapper, no upgrade fear.</p>
        </li>
        <li class="fs-17__callout">
          <span class="fs-17__icon" aria-hidden="true"><svg viewBox="0 0 24 24" width="17" height="17" fill="none" stroke="currentColor" stroke-width="1.8"><rect x="4" y="4" width="16" height="16" rx="3"/><path d="M9 12h6"/></svg></span>
          <h3 class="fs-17__ctitle">Accessible by construction</h3>
          <p class="fs-17__cprose">Focus management, roles and keyboard behaviour come from the primitive underneath, tested against three screen readers.</p>
        </li>
        <li class="fs-17__callout">
          <span class="fs-17__icon" aria-hidden="true"><svg viewBox="0 0 24 24" width="17" height="17" fill="none" stroke="currentColor" stroke-width="1.8"><circle cx="12" cy="12" r="8"/><path d="M12 8v8M8 12h8"/></svg></span>
          <h3 class="fs-17__ctitle">Themed by custom properties</h3>
          <p class="fs-17__cprose">One token file drives radius, spacing and colour across every component. No build-time theme generation.</p>
        </li>
      </ul>

      <div class="fs-17__codepane">
        <div class="fs-17__tabs">
          <span class="fs-17__tab" data-active>invoice-row.tsx</span>
          <span class="fs-17__tab">tokens.css</span>
          <button class="fs-17__copy" type="button">Copy</button>
        </div>
        <pre class="fs-17__pre"><code class="fs-17__code" id="fs-17-code"><span class="fs-17__c">// three primitives, one row</span>
<span class="fs-17__k">import</span> { Row, Badge, Menu } <span class="fs-17__k">from</span> <span class="fs-17__s">"@basalt/ui"</span>;

<span class="fs-17__k">export function</span> <span class="fs-17__f">InvoiceRow</span>({ invoice }) {
  <span class="fs-17__k">return</span> (
    &lt;Row <span class="fs-17__a">interactive</span> <span class="fs-17__a">href</span>={<span class="fs-17__s">"/i/"</span> + invoice.id}&gt;
      &lt;Row.<span class="fs-17__f">Cell</span> <span class="fs-17__a">weight</span>=<span class="fs-17__s">"medium"</span>&gt;{invoice.number}&lt;/Row.Cell&gt;
      &lt;Badge <span class="fs-17__a">tone</span>={invoice.overdue ? <span class="fs-17__s">"danger"</span> : <span class="fs-17__s">"neutral"</span>}&gt;
        {invoice.status}
      &lt;/Badge&gt;
      &lt;Menu <span class="fs-17__a">label</span>=<span class="fs-17__s">"Invoice actions"</span> <span class="fs-17__a">align</span>=<span class="fs-17__s">"end"</span> /&gt;
    &lt;/Row&gt;
  );
}</code></pre>
        <p class="fs-17__status" data-status hidden>Clipboard blocked here — the code is selected, press copy in your browser.</p>
      </div>
    </div>
  </div>

  <div class="fs-17__below" aria-hidden="true">44 components · source lives in your repo · CLI</div>
</section>
.fs-17 {
  width: 100%;
  min-height: 100vh;
  display: block;
  box-sizing: border-box;
  --bg: #0c0c0d;
  --bg: oklch(0.16 0.002 285);
  --pane: #131315;
  --pane: oklch(0.19 0.003 285);
  --ink: #ededee;
  --muted: #8e8e93;
  --muted: oklch(0.65 0.003 285);
  --rule: #26262a;
  --rule: oklch(0.28 0.004 285);
  --accent: #45d483;
  --accent: oklch(0.8 0.16 155);
  --pad: 11px;
  --font-display: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

.fs-17 *,
.fs-17 *::before,
.fs-17 *::after {
  box-sizing: border-box;
}

.fs-17__hero {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--pad) 14px;
  border-block-end: 1px solid var(--rule);
  font: 500 11.5px/1 var(--font-display);
  color: var(--muted);
}

.fs-17__wordmark {
  color: var(--ink);
}

.fs-17__stage {
  display: grid;
  place-items: start center;
  max-inline-size: 100%;
  padding: clamp(24px, 4.5vw, 50px) 12px;
}

.fs-17__head {
  inline-size: 100%;
  max-inline-size: 72rem;
  min-inline-size: 0;
  margin: 0 0 18px;
}

.fs-17__eyebrow {
  margin: 0 0 8px;
  font: 500 11px/1 var(--font-display);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.fs-17__heading {
  margin: 0;
  max-inline-size: 26ch;
  font: 600 clamp(23px, 4vw, 34px)/1.12 var(--font-display);
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.fs-17__split {
  inline-size: 100%;
  max-inline-size: 72rem;
  min-inline-size: 0;
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 12px;
  align-items: start;
}

.fs-17__callouts {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
}

.fs-17__callout {
  min-inline-size: 0;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 4px 10px;
  padding: 14px 13px;
  background: var(--pane);
}

.fs-17__icon {
  grid-row: span 2;
  display: grid;
  place-items: start center;
  padding-block-start: 2px;
  color: var(--accent);
}

.fs-17__ctitle {
  margin: 0;
  font: 600 14px/1.3 system-ui, sans-serif;
  letter-spacing: -0.01em;
}

.fs-17__cprose {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
  text-wrap: pretty;
}

.fs-17__codepane {
  min-inline-size: 0;
  background: var(--pane);
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
}

.fs-17__tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 8px;
  border-block-end: 1px solid var(--rule);
}

.fs-17__tab {
  padding: 6px 10px;
  font: 500 11.5px/1 var(--font-display);
  color: var(--muted);
  border-radius: 5px;
}

.fs-17__tab[data-active] {
  color: var(--ink);
  background: color-mix(in oklab, var(--ink) 8%, transparent);
  box-shadow: inset 0 -2px 0 var(--accent);
}

.fs-17__copy {
  margin-inline-start: auto;
  min-height: 30px;
  padding: 0 11px;
  font: 500 11px/1 var(--font-display);
  color: var(--bg);
  background: var(--accent);
  border: 0;
  border-radius: 5px;
  cursor: pointer;
}

.fs-17__copy:hover {
  background: color-mix(in oklab, var(--accent) 82%, white);
}

.fs-17__copy:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.fs-17__pre {
  margin: 0;
  padding: 12px;
  overflow-x: auto;
  tab-size: 2;
}

.fs-17__code {
  font: 400 12.5px/1.7 var(--font-display);
  color: var(--ink);
  white-space: pre;
}

.fs-17__k {
  color: #c4a6ff;
}

.fs-17__f {
  color: #7fd3f5;
}

.fs-17__a {
  color: #f0c073;
}

.fs-17__s {
  color: var(--accent);
}

.fs-17__c {
  color: #6b6b70;
  font-style: italic;
}

.fs-17__status {
  margin: 0;
  padding: 10px 12px;
  border-block-start: 1px solid var(--rule);
  font: 500 11.5px/1.5 var(--font-display);
  color: #f0c073;
}

.fs-17__below {
  padding: var(--pad) 14px;
  border-block-start: 1px solid var(--rule);
  font: 500 11px/1 var(--font-display);
  color: var(--muted);
}

@media (max-width: 820px) {
  .fs-17__split {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-color-scheme: light) {
  .fs-17 {
    --bg: #fbfbfc;
    --pane: #ffffff;
    --ink: #121214;
    --muted: #63636b;
    --rule: #e3e3e7;
    --accent: #0f7a45;
  }

  .fs-17__k {
    color: #6b32c9;
  }

  .fs-17__f {
    color: #14607c;
  }

  .fs-17__a {
    color: #8a5300;
  }

  .fs-17__c {
    color: #85858c;
  }

  .fs-17__copy {
    color: #ffffff;
  }

  .fs-17__status {
    color: #8a5300;
  }
}

[data-theme="dark"] .fs-17 {
  --bg: #0c0c0d;
  --pane: #131315;
  --ink: #ededee;
  --muted: #8e8e93;
  --rule: #26262a;
  --accent: #45d483;
}
const pane = document.querySelector('.fs-17__codepane');
if (pane) {
  const code = document.getElementById('fs-17-code');
  const btn = pane.querySelector('.fs-17__copy');
  const status = pane.querySelector('[data-status]');
  const fire = async () => {
    try {
      if (!navigator.clipboard) throw new Error('unavailable');
      await navigator.clipboard.writeText(code.innerText);
      btn.textContent = 'Copied';
      setTimeout(() => { btn.textContent = 'Copy'; }, 1600);
    } catch {
      btn.textContent = 'Selected';
      if (status) status.hidden = false;
      getSelection()?.selectAllChildren(code);
    }
  };
  btn.addEventListener('click', fire);
  btn.addEventListener('keydown', (e) => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); fire(); } });
}
Paste this into ChatGPT, Claude, Cursor, or any coding assistant. The block below is pre-framed with everything the AI needs to integrate this demo into your project — markup, styles, scoping notes, and the source URL. Hit Copy and paste straight into your chat.
Here's a working CSS Feature Section from CodeFronts. Use it as-is or adapt to your framework. All classes are scoped under a unique prefix so the code won't collide with your existing styles. MIT licensed.
Demo: Feature Section with Code Preview Snippet
Source: https://codefronts.com/layouts/css-feature-sections/css-feature-section-with-code-preview/

Three feature callouts on the left, a component-usage snippet on the right with a filename tab and a copy button. Syntax colour is hand-applied spans in a near-monochrome palette with one emerald accent, and the copy button feature-detects the clipboard so a blocked or insecure context gets a select-the-code fallback rather than a dead control.
## HTML
```html
<section class="fs-17" aria-labelledby="fs-17-heading">
  <div class="fs-17__hero" aria-hidden="true">
    <span class="fs-17__wordmark">Basalt UI</span>
    <span class="fs-17__heronav">components · primitives · themes</span>
  </div>

  <div class="fs-17__stage">
    <div class="fs-17__head">
      <p class="fs-17__eyebrow">Composition, not configuration</p>
      <h2 class="fs-17__heading" id="fs-17-heading">Primitives you own, styled with your tokens</h2>
    </div>

    <div class="fs-17__split">
      <ul class="fs-17__callouts">
        <li class="fs-17__callout">
          <span class="fs-17__icon" aria-hidden="true"><svg viewBox="0 0 24 24" width="17" height="17" fill="none" stroke="currentColor" stroke-width="1.8"><path d="M4 7h16M4 12h16M4 17h10"/></svg></span>
          <h3 class="fs-17__ctitle">Copied in, not installed</h3>
          <p class="fs-17__cprose">The component lands in your repository as source. Edit it, delete a prop, fork it — no wrapper, no upgrade fear.</p>
        </li>
        <li class="fs-17__callout">
          <span class="fs-17__icon" aria-hidden="true"><svg viewBox="0 0 24 24" width="17" height="17" fill="none" stroke="currentColor" stroke-width="1.8"><rect x="4" y="4" width="16" height="16" rx="3"/><path d="M9 12h6"/></svg></span>
          <h3 class="fs-17__ctitle">Accessible by construction</h3>
          <p class="fs-17__cprose">Focus management, roles and keyboard behaviour come from the primitive underneath, tested against three screen readers.</p>
        </li>
        <li class="fs-17__callout">
          <span class="fs-17__icon" aria-hidden="true"><svg viewBox="0 0 24 24" width="17" height="17" fill="none" stroke="currentColor" stroke-width="1.8"><circle cx="12" cy="12" r="8"/><path d="M12 8v8M8 12h8"/></svg></span>
          <h3 class="fs-17__ctitle">Themed by custom properties</h3>
          <p class="fs-17__cprose">One token file drives radius, spacing and colour across every component. No build-time theme generation.</p>
        </li>
      </ul>

      <div class="fs-17__codepane">
        <div class="fs-17__tabs">
          <span class="fs-17__tab" data-active>invoice-row.tsx</span>
          <span class="fs-17__tab">tokens.css</span>
          <button class="fs-17__copy" type="button">Copy</button>
        </div>
        <pre class="fs-17__pre"><code class="fs-17__code" id="fs-17-code"><span class="fs-17__c">// three primitives, one row</span>
<span class="fs-17__k">import</span> { Row, Badge, Menu } <span class="fs-17__k">from</span> <span class="fs-17__s">"@basalt/ui"</span>;

<span class="fs-17__k">export function</span> <span class="fs-17__f">InvoiceRow</span>({ invoice }) {
  <span class="fs-17__k">return</span> (
    &lt;Row <span class="fs-17__a">interactive</span> <span class="fs-17__a">href</span>={<span class="fs-17__s">"/i/"</span> + invoice.id}&gt;
      &lt;Row.<span class="fs-17__f">Cell</span> <span class="fs-17__a">weight</span>=<span class="fs-17__s">"medium"</span>&gt;{invoice.number}&lt;/Row.Cell&gt;
      &lt;Badge <span class="fs-17__a">tone</span>={invoice.overdue ? <span class="fs-17__s">"danger"</span> : <span class="fs-17__s">"neutral"</span>}&gt;
        {invoice.status}
      &lt;/Badge&gt;
      &lt;Menu <span class="fs-17__a">label</span>=<span class="fs-17__s">"Invoice actions"</span> <span class="fs-17__a">align</span>=<span class="fs-17__s">"end"</span> /&gt;
    &lt;/Row&gt;
  );
}</code></pre>
        <p class="fs-17__status" data-status hidden>Clipboard blocked here — the code is selected, press copy in your browser.</p>
      </div>
    </div>
  </div>

  <div class="fs-17__below" aria-hidden="true">44 components · source lives in your repo · CLI</div>
</section>
```
## CSS
```css
.fs-17 {
  width: 100%;
  min-height: 100vh;
  display: block;
  box-sizing: border-box;
  --bg: #0c0c0d;
  --bg: oklch(0.16 0.002 285);
  --pane: #131315;
  --pane: oklch(0.19 0.003 285);
  --ink: #ededee;
  --muted: #8e8e93;
  --muted: oklch(0.65 0.003 285);
  --rule: #26262a;
  --rule: oklch(0.28 0.004 285);
  --accent: #45d483;
  --accent: oklch(0.8 0.16 155);
  --pad: 11px;
  --font-display: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

.fs-17 *,
.fs-17 *::before,
.fs-17 *::after {
  box-sizing: border-box;
}

.fs-17__hero {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--pad) 14px;
  border-block-end: 1px solid var(--rule);
  font: 500 11.5px/1 var(--font-display);
  color: var(--muted);
}

.fs-17__wordmark {
  color: var(--ink);
}

.fs-17__stage {
  display: grid;
  place-items: start center;
  max-inline-size: 100%;
  padding: clamp(24px, 4.5vw, 50px) 12px;
}

.fs-17__head {
  inline-size: 100%;
  max-inline-size: 72rem;
  min-inline-size: 0;
  margin: 0 0 18px;
}

.fs-17__eyebrow {
  margin: 0 0 8px;
  font: 500 11px/1 var(--font-display);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.fs-17__heading {
  margin: 0;
  max-inline-size: 26ch;
  font: 600 clamp(23px, 4vw, 34px)/1.12 var(--font-display);
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.fs-17__split {
  inline-size: 100%;
  max-inline-size: 72rem;
  min-inline-size: 0;
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 12px;
  align-items: start;
}

.fs-17__callouts {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
}

.fs-17__callout {
  min-inline-size: 0;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 4px 10px;
  padding: 14px 13px;
  background: var(--pane);
}

.fs-17__icon {
  grid-row: span 2;
  display: grid;
  place-items: start center;
  padding-block-start: 2px;
  color: var(--accent);
}

.fs-17__ctitle {
  margin: 0;
  font: 600 14px/1.3 system-ui, sans-serif;
  letter-spacing: -0.01em;
}

.fs-17__cprose {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
  text-wrap: pretty;
}

.fs-17__codepane {
  min-inline-size: 0;
  background: var(--pane);
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
}

.fs-17__tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 8px;
  border-block-end: 1px solid var(--rule);
}

.fs-17__tab {
  padding: 6px 10px;
  font: 500 11.5px/1 var(--font-display);
  color: var(--muted);
  border-radius: 5px;
}

.fs-17__tab[data-active] {
  color: var(--ink);
  background: color-mix(in oklab, var(--ink) 8%, transparent);
  box-shadow: inset 0 -2px 0 var(--accent);
}

.fs-17__copy {
  margin-inline-start: auto;
  min-height: 30px;
  padding: 0 11px;
  font: 500 11px/1 var(--font-display);
  color: var(--bg);
  background: var(--accent);
  border: 0;
  border-radius: 5px;
  cursor: pointer;
}

.fs-17__copy:hover {
  background: color-mix(in oklab, var(--accent) 82%, white);
}

.fs-17__copy:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.fs-17__pre {
  margin: 0;
  padding: 12px;
  overflow-x: auto;
  tab-size: 2;
}

.fs-17__code {
  font: 400 12.5px/1.7 var(--font-display);
  color: var(--ink);
  white-space: pre;
}

.fs-17__k {
  color: #c4a6ff;
}

.fs-17__f {
  color: #7fd3f5;
}

.fs-17__a {
  color: #f0c073;
}

.fs-17__s {
  color: var(--accent);
}

.fs-17__c {
  color: #6b6b70;
  font-style: italic;
}

.fs-17__status {
  margin: 0;
  padding: 10px 12px;
  border-block-start: 1px solid var(--rule);
  font: 500 11.5px/1.5 var(--font-display);
  color: #f0c073;
}

.fs-17__below {
  padding: var(--pad) 14px;
  border-block-start: 1px solid var(--rule);
  font: 500 11px/1 var(--font-display);
  color: var(--muted);
}

@media (max-width: 820px) {
  .fs-17__split {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-color-scheme: light) {
  .fs-17 {
    --bg: #fbfbfc;
    --pane: #ffffff;
    --ink: #121214;
    --muted: #63636b;
    --rule: #e3e3e7;
    --accent: #0f7a45;
  }

  .fs-17__k {
    color: #6b32c9;
  }

  .fs-17__f {
    color: #14607c;
  }

  .fs-17__a {
    color: #8a5300;
  }

  .fs-17__c {
    color: #85858c;
  }

  .fs-17__copy {
    color: #ffffff;
  }

  .fs-17__status {
    color: #8a5300;
  }
}

[data-theme="dark"] .fs-17 {
  --bg: #0c0c0d;
  --pane: #131315;
  --ink: #ededee;
  --muted: #8e8e93;
  --rule: #26262a;
  --accent: #45d483;
}
```

## JavaScript
```js
const pane = document.querySelector('.fs-17__codepane');
if (pane) {
  const code = document.getElementById('fs-17-code');
  const btn = pane.querySelector('.fs-17__copy');
  const status = pane.querySelector('[data-status]');
  const fire = async () => {
    try {
      if (!navigator.clipboard) throw new Error('unavailable');
      await navigator.clipboard.writeText(code.innerText);
      btn.textContent = 'Copied';
      setTimeout(() => { btn.textContent = 'Copy'; }, 1600);
    } catch {
      btn.textContent = 'Selected';
      if (status) status.hidden = false;
      getSelection()?.selectAllChildren(code);
    }
  };
  btn.addEventListener('click', fire);
  btn.addEventListener('keydown', (e) => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); fire(); } });
}
```

How this works

The snippet has to be the real thing. A marketing code block that would not compile is worse than no code block, because the audience is exactly the group that reads it closely. Ship the import, the props you actually named, and the closing tag — and keep it under about fifteen lines, since past that nobody reads it on a marketing page anyway.

Hand-applied tokens beat a highlighter here. Twelve lines do not justify shipping a parser, and spans with class names for keyword, attribute, string and comment retint with the theme automatically. Keep the palette narrow: one accent for strings, one dimmed tone for comments, and the base ink for everything else. Rainbow highlighting on a marketing page reads as noise, not as code.

The copy button is where this pattern usually breaks. navigator.clipboard does not exist on plain HTTP, and writeText rejects when the document is not focused — the normal state inside a sandboxed preview. Guard the call, catch the rejection, and on failure select the code and relabel the button. Attach both a click and an Enter-key handler on a <button type='button'>: never a submit inside a form, which a sandbox without allow-forms will block outright.

The callouts carry the argument, the code carries the proof. Left column: three short claims with a small icon and one sentence each. Right column: the code that makes one of those claims verifiable. Keep them aligned at the top so the first callout reads level with the first line of the snippet — that alignment is what makes the pairing legible at a glance.

Make it yours

  • Replace the snippet with your own component usage — the token spans are the only markup to keep.
  • Change --accent to retint strings, the active tab underline and the copy button.
  • Add a second filename tab and a second <pre>, then switch them with the radio pattern from demo 01.
  • Set --pad to 14px if the compact density feels too tight for your audience.
  • Move the callouts to the right by swapping the two grid children's order.
  • Delete the copy button and its script to ship this section as Pure CSS.

Gotchas — read before shipping

  • An un-guarded navigator.clipboard.writeText() throws on plain HTTP and inside a sandboxed iframe — feature-detect and catch.
  • A copy button inside a <form> that relies on submit is blocked in a sandbox without allow-forms; use <button type='button'> with click and Enter handlers.
  • Marking the button as successful before the promise resolves reports a copy that did not happen.
  • Token colours tuned for a dark pane usually fail contrast on a light theme — declare them per theme.
  • Long JSX lines with no overflow-x on the <pre> stretch the grid track and push the page sideways.

Browser support

ChromeSafariFirefoxEdge
114+17.5+121+114+

Floor set by oklch(), color-mix(), text-wrap as this demo is written. The core technique itself goes back further — Chrome 111+.

oklch() dictates the CSS floor (Chromium 111, Safari 15.4, Firefox 113), with sRGB hex declared first for each token colour. navigator.clipboard.writeText() requires a secure context and is feature-detected; where it is unavailable the button selects the code and relabels itself instead of failing silently.

Techniques used in this demo

text-wrap: prettyMDN ↗color-mix()MDN ↗grid-templateMDN ↗clamp()MDN ↗place-items / place-contentMDN ↗oklch()MDN ↗

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