ui-demo

UI Demo Video Recorder

Record polished demo videos of web applications using Playwright's video recording with an injected cursor overlay, natural pacing, and storytelling flow.

When to Use

• User asks for a "demo video", "screen recording", "walkthrough", or "tutorial"
• User wants to showcase a feature or workflow visually
• User needs a video for documentation, onboarding, or stakeholder presentation

Three-Phase Process

Every demo goes through three phases: Discover -> Rehearse -> Record. Never skip straight to recording.

Phase 1: Discover

Before writing any script, explore the target pages to understand what is actually there.

Why

You cannot script what you have not seen. Fields may be <input> not <textarea>, dropdowns may be custom components not <select>, and comment boxes may support @mentions or #tags. Assumptions break recordings silently.

How

Navigate to each page in the flow and dump its interactive elements:

// Run this for each page in the flow BEFORE writing the demo script
const fields = await page.evaluate(() => {
  const els = [];
  document.querySelectorAll('input, select, textarea, button, [contenteditable]').forEach(el => {
    if (el.offsetParent !== null) {
      els.push({
        tag: el.tagName,
        type: el.type || '',
        name: el.name || '',
        placeholder: el.placeholder || '',
        text: el.textContent?.trim().substring(0, 40) || '',
        contentEditable: el.contentEditable === 'true',
        role: el.getAttribute('role') || '',
      });
    }
  });
  return els;
});
console.log(JSON.stringify(fields, null, 2));

What to look for

• Form fields: Are they <select>, <input>, custom dropdowns, or comboboxes?
• Select options: Dump option values AND text. Placeholders often have value="0" or value="" which looks non-empty. Use Array.from(el.options).map(o => ({ value: o.value, text: o.text })). Skip options where text includes "Select" or value is "0".
• Rich text: Does the comment box support @mentions, #tags, markdown, or emoji? Check placeholder text.
• Required fields: Which fields block form submission? Check required, * in labels, and try submitting empty to see validation errors.
• Dynamic content: Do fields appear after other fields are filled?
• Button labels: Exact text such as "Submit", "Submit Request", or "Send".
• Table column headers: For table-driven modals, map each input[type="number"] to its column header instead of assuming all numeric inputs mean the same thing.

Output

A field map for each page, used to write correct selectors in the script. Example:

/purchase-requests/new:
  - Budget Code: <select> (first select on page, 4 options)
  - Desired Delivery: <input type="date">
  - Context: <textarea> (not input)
  - BOM table: inline-editable cells with span.cursor-pointer -> input pattern
  - Submit: <button> text="Submit"

/purchase-requests/N (detail):
  - Comment: <input placeholder="Type a message..."> supports @user and #PR tags
  - Send: <button> text="Send" (disabled until input has content)

Phase 2: Rehearse

Run through all steps without recording. Verify every selector resolves.

Why

Silent selector failures are the main reason demo recordings break. Rehearsal catches them before you waste a recording.

How

Use ensureVisible, a wrapper that logs and fails loudly:

async function ensureVisible(page, locator, label) {
  const el = typeof locator === 'string' ? page.locator(locator).first() : locator;
  const visible = await el.isVisible().catch(() => false);
  if (!visible) {
    const msg = `REHEARSAL FAIL: "${label}" not found - selector: ${typeof locator === 'string' ? locator : '(locator object)'}`;
    console.error(msg);
    const found = await page.evaluate(() => {
      return Array.from(document.querySelectorAll('button, input, select, textarea, a'))
        .filter(el => el.offsetParent !== null)
        .map(el => `${el.tagName}[${el.type || ''}] "${el.textContent?.trim().substring(0, 30)}"`)
        .join('\n  ');
    });
    console.error('  Visible elements:\n  ' + found);
    return false;
  }
  console.log(`REHEARSAL OK: "${label}"`);
  return true;
}

Rehearsal script structure

const steps = [
  { label: 'Login email field', selector: '#email' },
  { label: 'Login submit', selector: 'button[type="submit"]' },
  { label: 'New Request button', selector: 'button:has-text("New Request")' },
  { label: 'Budget Code select', selector: 'select' },
  { label: 'Delivery date', selector: 'input[type="date"]:visible' },
  { label: 'Description field', selector: 'textarea:visible' },
  { label: 'Add Item button', selector: 'button:has-text("Add Item")' },
  { label: 'Submit button', selector: 'button:has-text("Submit")' },
];

let allOk = true;
for (const step of steps) {
  if (!await ensureVisible(page, step.selector, step.label)) {
    allOk = false;
  }
}
if (!allOk) {
  console.error('REHEARSAL FAILED - fix selectors before recording');
  process.exit(1);
}
console.log('REHEARSAL PASSED - all selectors verified');

When rehearsal fails

1. Read the visible-element dump.
2. Find the correct selector.
3. Update the script.
4. Re-run rehearsal.
5. Only proceed when every selector passes.

Phase 3: Record

Only after discovery and rehearsal pass should you create the recording.

Recording Principles

1. Storytelling Flow

Plan the video as a story. Follow user-specified order, or use this default:

• Entry: Login or navigate to the starting point
• Context: Pan the surroundings so viewers orient themselves
• Action: Perform the main workflow steps
• Variation: Show a secondary feature such as settings, theme, or localization
• Result: Show the outcome, confirmation, or new state

2. Pacing

• After login: 4s
• After navigation: 3s
• After clicking a button: 2s
• Between major steps: 1.5-2s
• After the final action: 3s
• Typing delay: 25-40ms per character

3. Cursor Overlay

Inject an SVG arrow cursor that follows mouse movements:

async function injectCursor(page) {
  await page.evaluate(() => {
    if (document.getElementById('demo-cursor')) return;
    const cursor = document.createElement('div');
    cursor.id = 'demo-cursor';
    cursor.innerHTML = `<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
      <path d="M5 3L19 12L12 13L9 20L5 3Z" fill="white" stroke="black" stroke-width="1.5" stroke-linejoin="round"/>
    </svg>`;
    cursor.style.cssText = `
      position: fixed; z-index: 999999; pointer-events: none;
      width: 24px; height: 24px;
      transition: left 0.1s, top 0.1s;
      filter: drop-shadow(1px 1px 2px rgba(0,0,0,0.3));
    `;
    cursor.style.left = '0px';
    cursor.style.top = '0px';
    document.body.appendChild(cursor);
    document.addEventListener('mousemove', (e) => {
      cursor.style.left = e.clientX + 'px';
      cursor.style.top = e.clientY + 'px';
    });
  });
}

Call injectCursor(page) after every page navigation because the overlay is destroyed on navigate.

4. Mouse Movement

Never teleport the cursor. Move to the target before clicking:

async function moveAndClick(page, locator, label, opts = {}) {
  const { postClickDelay = 800, ...clickOpts } = opts;
  const el = typeof locator === 'string' ? page.locator(locator).first() : locator;
  const visible = await el.isVisible().catch(() => false);
  if (!visible) {
    console.error(`WARNING: moveAndClick skipped - "${label}" not visible`);
    return false;
  }
  try {
    await el.scrollIntoViewIfNeeded();
    await page.waitForTimeout(300);
    const box = await el.boundingBox();
    if (box) {
      await page.mouse.move(box.x + box.width / 2, box.y + box.height / 2, { steps: 10 });
      await page.waitForTimeout(400);
    }
    await el.click(clickOpts);
  } catch (e) {
    console.error(`WARNING: moveAndClick failed on "${label}": ${e.message}`);
    return false;
  }
  await page.waitForTimeout(postClickDelay);
  return true;
}

Every call should include a descriptive label for debugging.

5. Typing

Type visibly, not instant-fill:

async function typeSlowly(page, locator, text, label, charDelay = 35) {
  const el = typeof locator === 'string' ? page.locator(locator).first() : locator;
  const visible = await el.isVisible().catch(() => false);
  if (!visible) {
    console.error(`WARNING: typeSlowly skipped - "${label}" not visible`);
    return false;
  }
  await moveAndClick(page, el, label);
  await el.fill('');
  await el.pressSequentially(text, { delay: charDelay });
  await page.waitForTimeout(500);
  return true;
}

6. Scrolling

Use smooth scroll instead of jumps:

await page.evaluate(() => window.scrollTo({ top: 400, behavior: 'smooth' }));
await page.waitForTimeout(1500);

7. Dashboard Panning

When showing a dashboard or overview page, move the cursor across key elements:

async function panElements(page, selector, maxCount = 6) {
  const elements = await page.locator(selector).all();
  for (let i = 0; i < Math.min(elements.length, maxCount); i++) {
    try {
      const box = await elements[i].boundingBox();
      if (box && box.y < 700) {
        await page.mouse.move(box.x + box.width / 2, box.y + box.height / 2, { steps: 8 });
        await page.waitForTimeout(600);
      }
    } catch (e) {
      console.warn(`WARNING: panElements skipped element ${i} (selector: "${selector}"): ${e.message}`);
    }
  }
}

8. Subtitles

Inject a subtitle bar at the bottom of the viewport:

async function injectSubtitleBar(page) {
  await page.evaluate(() => {
    if (document.getElementById('demo-subtitle')) return;
    const bar = document.createElement('div');
    bar.id = 'demo-subtitle';
 

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