090 Countdown Builder

1 test · 1 finished runs (0 agent, 1 raw one-shot) · 1 live demo

The prompt

Countdown Builder: A countdown maker: enter an event name and a target date and time, and it displays days, hours, minutes and seconds in flip-style digits. Multiple countdowns can be saved to a list in localStorage, sorted by nearest, and an expired event shows a celebration. Build it as ONE self-contained HTML file: inline CSS and JavaScript only, no libraries or frameworks, and no external requests of any kind (no CDNs, web fonts, images or audio files); anything visual or audible is made in code (HTML/CSS, SVG, Canvas, WebGL or WebAudio). It must work when opened directly from disk, fit the browser window responsively, and run without console errors. Output ONLY the complete HTML file, starting with <!DOCTYPE html> and ending with </html>, with no explanation or markdown fences.