GizDevCraft Editor - JS Errors

HTML

CSS

<main class="lesson-shell">
  <section class="demo-card">
    <span class="eyebrow">JS Errors</span>
    <h1>JavaScript practice area</h1>
    <p>Use the button, list, and output below while editing the JavaScript tab.</p>
    <button id="runDemo" type="button">Run demo action</button>
    <ul class="demo-list">
      <li data-score="10">HTML</li>
      <li data-score="20">CSS</li>
      <li data-score="30">JavaScript</li>
    </ul>
    <pre id="output">Output appears here.</pre>
  </section>
</main>

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f8fafc;
  color: #111827;
}

.lesson-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.demo-card {
  width: min(760px, 100%);
  background: #ffffff;
  border: 1px solid #dbe3ef;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 18px 45px rgb(15 23 42 / .10);
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: .75rem;
  color: #4f46e5;
  font-weight: 800;
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 .75rem;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

p {
  color: #536471;
  line-height: 1.7;
}

button {
  border: 0;
  border-radius: 8px;
  padding: .75rem 1rem;
  background: #4f46e5;
  color: white;
  font-weight: 800;
  cursor: pointer;
}

.demo-target {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.box {
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  padding: 1.25rem;
  background: #f8fafc;
  font-weight: 800;
}

.featured {
  background: #eef2ff;
  color: #3730a3;
}
.demo-list { display: grid; gap: .5rem; padding-left: 1.2rem; }
#output { background: #111827; color: #e5e7eb; padding: 1rem; border-radius: 8px; overflow: auto; }

function parseMinutes(value) {
  const minutes = Number(value);
  if (Number.isNaN(minutes)) {
    throw new Error('Minutes must be a number');
  }
  return minutes;
}

try {
  document.querySelector('#output').textContent = parseMinutes('42');
} catch (error) {
  console.error(error);
}

const output = document.querySelector('#output');
document.querySelector('#runDemo')?.addEventListener('click', () => {
  output.textContent = 'Starter for ' + "JS Errors" + ' is ready. Edit the JS tab and run again.';
});