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Code Output Preview

Source: D:\mythos-coder-data\data\train\mythos_sft_messages_clean.jsonl Matched examples: 721 (showing up to 30)

Example 1 — PASS

User prompt: Create a complete modal dialog demo (HTML/CSS/JS) for variant 3. User must get full code files. [50projects50days-complete_file_build-003]

<!DOCTYPE html>: True
<style>: False
<script>: True
classList.toggle open: False
external styles.css/app.js: True
fails: none

Assistant (first 1600 chars):

Here is the complete code:
File: index.html
```html
<!DOCTYPE html><html><body><button id="openModal">Open</button><div id="modalOverlay" class="modal"><div class="modal-card"><button id="modalClose">×</button><p>Hello</p></div></div><script src="modal.js"></script></body></html>

File: modal.css

.modal { display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); align-items:center; justify-content:center; }
.modal.active { display:flex; }

File: modal.js

const overlay = document.getElementById('modalOverlay');
document.getElementById('openModal').onclick = () => overlay.classList.add('active');
document.getElementById('modalClose').onclick = () => overlay.classList.remove('active');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 2 — PASS

**User prompt:** Create a complete modal dialog demo (HTML/CSS/JS) for variant 7. User must get full code files. [50projects50days-complete_file_build-007]

- `<!DOCTYPE html>`: True
- `<style>`: False
- `<script>`: True
- classList.toggle open: False
- external styles.css/app.js: True
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: File: index.html

<!DOCTYPE html><html><body><button id="openModal">Open</button><div id="modalOverlay" class="modal"><div class="modal-card"><button id="modalClose">×</button><p>Hello</p></div></div><script src="modal.js"></script></body></html>

File: modal.css

.modal { display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); align-items:center; justify-content:center; }
.modal.active { display:flex; }

File: modal.js

const overlay = document.getElementById('modalOverlay');
document.getElementById('openModal').onclick = () => overlay.classList.add('active');
document.getElementById('modalClose').onclick = () => overlay.classList.remove('active');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 3 — PASS

**User prompt:** Create a complete modal dialog demo (HTML/CSS/JS) for variant 11. User must get full code files. [50projects50days-complete_file_build-011]

- `<!DOCTYPE html>`: True
- `<style>`: False
- `<script>`: True
- classList.toggle open: False
- external styles.css/app.js: True
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: File: index.html

<!DOCTYPE html><html><body><button id="openModal">Open</button><div id="modalOverlay" class="modal"><div class="modal-card"><button id="modalClose">×</button><p>Hello</p></div></div><script src="modal.js"></script></body></html>

File: modal.css

.modal { display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); align-items:center; justify-content:center; }
.modal.active { display:flex; }

File: modal.js

const overlay = document.getElementById('modalOverlay');
document.getElementById('openModal').onclick = () => overlay.classList.add('active');
document.getElementById('modalClose').onclick = () => overlay.classList.remove('active');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 4 — PASS

**User prompt:** Create a complete modal dialog demo (HTML/CSS/JS) for variant 15. User must get full code files. [50projects50days-complete_file_build-015]

- `<!DOCTYPE html>`: True
- `<style>`: False
- `<script>`: True
- classList.toggle open: False
- external styles.css/app.js: True
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: File: index.html

<!DOCTYPE html><html><body><button id="openModal">Open</button><div id="modalOverlay" class="modal"><div class="modal-card"><button id="modalClose">×</button><p>Hello</p></div></div><script src="modal.js"></script></body></html>

File: modal.css

.modal { display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); align-items:center; justify-content:center; }
.modal.active { display:flex; }

File: modal.js

const overlay = document.getElementById('modalOverlay');
document.getElementById('openModal').onclick = () => overlay.classList.add('active');
document.getElementById('modalClose').onclick = () => overlay.classList.remove('active');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 5 — PASS

**User prompt:** Create a complete modal dialog demo (HTML/CSS/JS) for variant 19. User must get full code files. [50projects50days-complete_file_build-019]

- `<!DOCTYPE html>`: True
- `<style>`: False
- `<script>`: True
- classList.toggle open: False
- external styles.css/app.js: True
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: File: index.html

<!DOCTYPE html><html><body><button id="openModal">Open</button><div id="modalOverlay" class="modal"><div class="modal-card"><button id="modalClose">×</button><p>Hello</p></div></div><script src="modal.js"></script></body></html>

File: modal.css

.modal { display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); align-items:center; justify-content:center; }
.modal.active { display:flex; }

File: modal.js

const overlay = document.getElementById('modalOverlay');
document.getElementById('openModal').onclick = () => overlay.classList.add('active');
document.getElementById('modalClose').onclick = () => overlay.classList.remove('active');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 6 — PASS

**User prompt:** Create a complete modal dialog demo (HTML/CSS/JS) for variant 23. User must get full code files. [50projects50days-complete_file_build-023]

- `<!DOCTYPE html>`: True
- `<style>`: False
- `<script>`: True
- classList.toggle open: False
- external styles.css/app.js: True
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: File: index.html

<!DOCTYPE html><html><body><button id="openModal">Open</button><div id="modalOverlay" class="modal"><div class="modal-card"><button id="modalClose">×</button><p>Hello</p></div></div><script src="modal.js"></script></body></html>

File: modal.css

.modal { display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); align-items:center; justify-content:center; }
.modal.active { display:flex; }

File: modal.js

const overlay = document.getElementById('modalOverlay');
document.getElementById('openModal').onclick = () => overlay.classList.add('active');
document.getElementById('modalClose').onclick = () => overlay.classList.remove('active');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 7 — PASS

**User prompt:** Create a complete modal dialog demo (HTML/CSS/JS) for variant 27. User must get full code files. [50projects50days-complete_file_build-027]

- `<!DOCTYPE html>`: True
- `<style>`: False
- `<script>`: True
- classList.toggle open: False
- external styles.css/app.js: True
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: File: index.html

<!DOCTYPE html><html><body><button id="openModal">Open</button><div id="modalOverlay" class="modal"><div class="modal-card"><button id="modalClose">×</button><p>Hello</p></div></div><script src="modal.js"></script></body></html>

File: modal.css

.modal { display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); align-items:center; justify-content:center; }
.modal.active { display:flex; }

File: modal.js

const overlay = document.getElementById('modalOverlay');
document.getElementById('openModal').onclick = () => overlay.classList.add('active');
document.getElementById('modalClose').onclick = () => overlay.classList.remove('active');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 8 — PASS

**User prompt:** Fix mobile nav bug #31: CSS uses .nav-links.open but JS toggles .open on .hamburger. Show broken code and corrected code. [50projects50days-bug_fix-031]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Broken (app.js):

document.querySelector('.hamburger').addEventListener('click', () => {
  document.querySelector('.hamburger').classList.toggle('open');
});

Fixed (app.js):

const navLinks = document.querySelector('.nav-links');
document.querySelector('.hamburger').addEventListener('click', () => {
  navLinks.classList.toggle('open');
});

CSS stays:

.nav-links.open { display: flex; }

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 9 — PASS

**User prompt:** Fix canvas runner #34 where collision triggers before visual overlap. Provide corrected hitbox code. [50projects50days-bug_fix-034]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Broken:

if (obs.x < player.x + 10) gameOver();

Fixed:

const hit = obs.x < player.x + 18 && obs.x + obs.w > player.x && player.y + 18 > 130;
if (hit) gameOver();

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 10 — PASS

**User prompt:** Fix mobile nav bug #36: CSS uses .nav-links.open but JS toggles .open on .hamburger. Show broken code and corrected code. [50projects50days-bug_fix-036]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Broken (app.js):

document.querySelector('.hamburger').addEventListener('click', () => {
  document.querySelector('.hamburger').classList.toggle('open');
});

Fixed (app.js):

const navLinks = document.querySelector('.nav-links');
document.querySelector('.hamburger').addEventListener('click', () => {
  navLinks.classList.toggle('open');
});

CSS stays:

.nav-links.open { display: flex; }

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 11 — PASS

**User prompt:** Fix canvas runner #39 where collision triggers before visual overlap. Provide corrected hitbox code. [50projects50days-bug_fix-039]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Broken:

if (obs.x < player.x + 10) gameOver();

Fixed:

const hit = obs.x < player.x + 18 && obs.x + obs.w > player.x && player.y + 18 > 130;
if (hit) gameOver();

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 12 — PASS

**User prompt:** Fix mobile nav bug #41: CSS uses .nav-links.open but JS toggles .open on .hamburger. Show broken code and corrected code. [50projects50days-bug_fix-041]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Broken (app.js):

document.querySelector('.hamburger').addEventListener('click', () => {
  document.querySelector('.hamburger').classList.toggle('open');
});

Fixed (app.js):

const navLinks = document.querySelector('.nav-links');
document.querySelector('.hamburger').addEventListener('click', () => {
  navLinks.classList.toggle('open');
});

CSS stays:

.nav-links.open { display: flex; }

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 13 — PASS

**User prompt:** Fix canvas runner #44 where collision triggers before visual overlap. Provide corrected hitbox code. [50projects50days-bug_fix-044]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Broken:

if (obs.x < player.x + 10) gameOver();

Fixed:

const hit = obs.x < player.x + 18 && obs.x + obs.w > player.x && player.y + 18 > 130;
if (hit) gameOver();

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 14 — PASS

**User prompt:** Fix mobile nav bug #46: CSS uses .nav-links.open but JS toggles .open on .hamburger. Show broken code and corrected code. [50projects50days-bug_fix-046]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Broken (app.js):

document.querySelector('.hamburger').addEventListener('click', () => {
  document.querySelector('.hamburger').classList.toggle('open');
});

Fixed (app.js):

const navLinks = document.querySelector('.nav-links');
document.querySelector('.hamburger').addEventListener('click', () => {
  navLinks.classList.toggle('open');
});

CSS stays:

.nav-links.open { display: flex; }

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 15 — PASS

**User prompt:** Fix canvas runner #49 where collision triggers before visual overlap. Provide corrected hitbox code. [50projects50days-bug_fix-049]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Broken:

if (obs.x < player.x + 10) gameOver();

Fixed:

const hit = obs.x < player.x + 18 && obs.x + obs.w > player.x && player.y + 18 > 130;
if (hit) gameOver();

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 16 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 66. Include executable check code. [50projects50days-browser_verification-066]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 17 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 67. Include executable check code. [50projects50days-browser_verification-067]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 18 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 68. Include executable check code. [50projects50days-browser_verification-068]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 19 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 69. Include executable check code. [50projects50days-browser_verification-069]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 20 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 70. Include executable check code. [50projects50days-browser_verification-070]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 21 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 71. Include executable check code. [50projects50days-browser_verification-071]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 22 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 72. Include executable check code. [50projects50days-browser_verification-072]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 23 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 73. Include executable check code. [50projects50days-browser_verification-073]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 24 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 74. Include executable check code. [50projects50days-browser_verification-074]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 25 — PASS

**User prompt:** Write a browser test script (Playwright-style steps as JS comments + DOM checks) for 50projects50days mobile nav variant 75. Include executable check code. [50projects50days-browser_verification-075]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: False
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code:

// Run in devtools at 375px width
const btn = document.querySelector('.hamburger');
const nav = document.querySelector('.nav-links');
console.assert(!nav.classList.contains('open'), 'nav starts closed');
btn.click();
console.assert(nav.classList.contains('open'), 'nav opens after click');
btn.click();
console.assert(!nav.classList.contains('open'), 'nav closes on second click');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 26 — PASS

**User prompt:** Fix selector mismatch #76: CSS expects .nav-links.open but JS toggles .open on .hamburger. Show exact JS change with code. [50projects50days-selector_precision-076]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Wrong target:

document.querySelector('.hamburger').classList.toggle('open');

Correct target:

document.querySelector('.nav-links').classList.toggle('open');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 27 — PASS

**User prompt:** Fix selector mismatch #77: Modal CSS uses #modalOverlay.active but JS toggles .active on #openModal button. Show exact JS change with code. [50projects50days-selector_precision-077]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Wrong target:

document.querySelector('#openModal').classList.toggle('open');

Correct target:

document.querySelector('#modalOverlay').classList.toggle('open');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 28 — PASS

**User prompt:** Fix selector mismatch #78: Form error styling expects .field-wrapper.invalid but JS adds .invalid to label. Show exact JS change with code. [50projects50days-selector_precision-078]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Wrong target:

document.querySelector('label').classList.toggle('open');

Correct target:

document.querySelector('.field-wrapper').classList.toggle('open');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 29 — PASS

**User prompt:** Fix selector mismatch #79: Accordion panel visibility uses .accordion-panel.open on panel, not .accordion-header. Show exact JS change with code. [50projects50days-selector_precision-079]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Wrong target:

document.querySelector('.accordion-header').classList.toggle('open');

Correct target:

document.querySelector('.accordion-panel').classList.toggle('open');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Example 30 — PASS

**User prompt:** Fix selector mismatch #80: Tab content uses .tab-panel.active on panel container, not on .tab-button. Show exact JS change with code. [50projects50days-selector_precision-080]

- `<!DOCTYPE html>`: False
- `<style>`: False
- `<script>`: False
- classList.toggle open: True
- external styles.css/app.js: False
- fails: none

**Assistant (first 1600 chars):**

Here is the complete code: Wrong target:

document.querySelector('.tab-button').classList.toggle('open');

Correct target:

document.querySelector('.tab-panel').classList.toggle('open');

Verification:

The assistant response includes actual code when code is requested
The code targets the correct selector, file, function, or state variable
The response does not only give a plan
The verification checks the exact behavior changed


## Summary

- Previewed: 30
- Pass: 30
- Fail: 0

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