Animated loader · qwen3.8-27b

Create index.html using GSAP. Let's give it a try.

GSAP 3.12.5, core only — no problems. Build a looping timeline using repeat:-1, and design it so that start and end states match (using from/to within the loop, or yoyo). Create a 4-second timeline, with each tween starting and ending at the same value (e.g., using a round trip), or use ease "power1.inOut" and go out-and-back.

Design: 4 shapes (rounded squares/circles) that morph their scale, position, and border-radius. 5 dots in a horizontal row, with a stagger.

Note: restart() on a paused timeline — does gsap's restart() play it? Actually, does timeline.restart() call play() after setting time to 0? restart() → seeks to the starting point and plays (calls play()). Yes, restart() starts playback. Good.

Alright, let's test in the browser.

Initial frame looks fine — shapes, dots, controls all centered. Console is clean (only sandbox warnings from the harness). Next, sampling the timeline at several time points: pause, then use tl.time() via the console to verify the changes. Can I run JS? The browser tool doesn't have an eval action. What's available is reload, inspect, click, key, type, scroll, screenshot, motion. "inspect" probably returns DOM/console. No eval. I can sample the motion frames with the "motion" action and click Pause to test pause.

Let me test: click Pause, take a screenshot, wait a bit (with the 2nd screenshot), compare that it's frozen. Then click Resume and take another screenshot. Then restart.

Actually, can I expose the timeline on window? I didn't expose it. For verification, I could rely on visual motion frames and pause/resume screenshots. But for "sample the timeline at multiple time points" — maybe I can add a debug hook: expose window.__tl = tl. That would be fine and harmless. But I can't eval in the browser… unless inspect can be used to execute JS. Probably not. Instead, I can verify with screenshots at different time points: pause, screenshot; then use the key? No.

Simplest approach: expose window.__tl for testability (harmless), and verify visually. Let me use the motion action to check the animation frames.

The animation is progressing correctly: the shape morphs, and the dots display a staggered wave (in frame 4, you can see the reverse-order wave — from the end side). Next, testing the controls: click Pause, take 2 screenshots to confirm the frozen state, then Resume, and then Restart.

The button currently displays "Resume" — paused. Verify that it's frozen: take a screenshot, wait a bit, then take another screenshot. The motion action takes a frame while paused — if it's paused, the frame should be identical.

The frame is identical over about 1.6 seconds while paused → the timeline position is correctly frozen. Next, click Resume and confirm that the animation has resumed (the motion frame is changing), and after that click Restart and confirm that the starting composition is displayed.

Resumed (button shows "Pause", same paused frame — will continue from the pause point). Verify that it's actually moving again, then test Restart.

Resumed from the paused point and continued (frame 1 matches the paused state, and the subsequent frames show the wave and shape animation progressing, and the second half of the loop is also visible). Next, click Restart to check the initial composition.

Restart works: the initial composition is displayed (shapes at base position, amber square not rotated, dots at base position with full opacity), button displays "Pause" (restarted playback). Everything verified. Done.