In this video· click a step to jump to it
S
Passed ✓
Test recording
Semicolony — CPU visualizer walk
82,779 ms · 3,540 pixels changed
We built this regression test for semicolony.dev — it's yours to keep, free.
Take this test with you
This is a real Playwright test, recorded against semicolony.dev. Claim it into your own workspace and re-run it on every deploy — free.
export async function test(page, baseUrl, screenshotPath, stepLogger) {
let scn = 0;
const shot = async (slug) => {
scn += 1;
const p = screenshotPath.replace('.png', `-${String(scn).padStart(2,'0')}-${slug}.png`);
try { await page.screenshot({ path: p, fullPage: true }); } catch (e) {}
stepLogger.log(`shot ${scn} ${slug}`);
};
await page.goto(baseUrl, { waitUntil: 'domcontentloaded', timeout: 20000 });
await page.waitForLoadState('networkidle', { timeout: 8000 }).catch(() => {});
await page.waitForTimeout(2500);Checks run
Run
✓
Visual
0.09%
Text
—
DOM
✓
Network
+7 −14
Console
✓
A11y
—
Perf
224 over
URL
7 diverged
Variables
—
Full report
Log in →
3,540
Diff px
1m 23s
Duration
—
Accessible
C
Fast
Web Vitals · 70
Notes from the demo run
AI-generatedSemicolony visualizes what happens inside a CPU when a program runs — long scrolling explainer with embedded interactive elements. No login. Single-page educational tool aimed at programmers learning systems internals.
Highlights
- Single-page longread + interactiveCombines an explainer's clarity with hands-on Run/Step controls. The pacing across 4 sections feels deliberate.
Friction points
- Interactive controls discoverabilityThe Run/Step buttons live mid-scroll; readers who skim past them miss the interactive payoff. A sticky 'jump to interactive' anchor would help.
7 visual changes
Share this run
Earned · Lastest awards
Proof your app is not AI slop
Badges stay live, ratchet upward, only downgrade on confirmed regression.
57,604 test runs recorded · 1,174 products tested with Lastest
This test was built for semicolony.dev — claim it free
One click copies the test and baseline screenshots into your own Lastest workspace. Re-run on every deploy and catch regressions before your users do — free, no card required.




















