stir.html · 24 lines
<!DOCTYPE html><html><head><style>
body{margin:0;background:#2b2f3a;height:100vh;display:flex;align-items:center;justify-content:center}
.s{position:relative;width:400px;height:360px}
.plate{position:absolute;left:30px;top:290px;width:340px;height:60px;border-radius:50%;background:#e8e8ee;box-shadow:0 8px 12px #0006}
.handle{position:absolute;left:290px;top:130px;width:60px;height:110px;border:22px solid #f4f4f8;border-left-color:transparent;border-radius:0 70px 70px 0;box-sizing:border-box;border-width:16px 16px 16px 0;border:16px solid #f4f4f8;border-left:none;border-radius:0 60px 60px 0;width:70px;height:100px}
.cup{position:absolute;left:70px;top:90px;width:240px;height:220px;background:linear-gradient(90deg,#d8d8e0,#fff 40%,#ccd);border-radius:0 0 120px 120px/0 0 190px 190px}
.rim{position:absolute;left:70px;top:60px;width:240px;height:70px;border-radius:50%;background:#f4f4f8;box-shadow:inset 0 -3px 6px #0003}
.coffee{position:absolute;left:80px;top:68px;width:220px;height:54px;border-radius:50%;background:radial-gradient(ellipse,#6b3d20,#3a1c0c 70%);overflow:hidden}
.swirl{position:absolute;left:55px;top:10px;width:110px;height:34px;border-radius:50%;border:3px solid #a9693a;border-color:#a9693a transparent transparent transparent;animation:r 2s linear infinite}
.swirl.b{left:30px;top:3px;width:160px;height:48px;animation-duration:3s;opacity:.6}
@keyframes r{to{transform:rotate(360deg)}}
.orbit{position:absolute;left:140px;top:25px;width:100px;height:50px;animation:o 2s linear infinite}
@keyframes o{0%{transform:translate(55px,0)}25%{transform:translate(0,14px)}50%{transform:translate(-55px,0)}75%{transform:translate(0,-14px)}100%{transform:translate(55px,0)}}
.spoon{position:absolute;width:12px;height:150px;transform-origin:6px 140px;transform:rotate(22deg)}
.spoon i{position:absolute;left:3px;top:0;width:6px;height:120px;background:linear-gradient(90deg,#999,#fff,#888);border-radius:3px}
.spoon b{position:absolute;left:-4px;top:110px;width:20px;height:34px;border-radius:50%;background:#ccd}
.front{position:absolute;left:80px;top:95px;width:220px;height:35px;overflow:hidden;border-radius:0 0 0 0;display:none}
</style></head><body><div class="s">
<div class="plate"></div><div class="handle"></div><div class="cup"></div>
<div class="rim"></div>
<div class="coffee"><div class="swirl"></div><div class="swirl b"></div></div>
<div class="orbit" style="left:190px;top:100px"><div class="spoon" style="top:-140px;left:-6px"><i></i><b></b></div></div>
</body></html>round 1 of 2
A spoon stirring in a cup, in HTML and CSS: Claude Sonnet 5.5
modelanthropic/claude-sonnet-5.5taskcss-stirring-spoon@v1, checks c1, harness h1date2026-10-19rounds2 of 8 allowed, 12 minutes on the clockcost$0.0103thinkingmediumtokens24,248 in, 2,634 out, of which 340 reasoningtime50 s
HTML and CSS onlydecided by a number, from the filepass
A CSS loop that moves somethingdecided by a number, from the filepass
Reads as a cup seen intodecided by looking · someone else could reasonably disagreepass
The spoon does the stirringdecided by looking · someone else could reasonably disagreepass
Reads as inside the cupdecided by looking · someone else could reasonably disagreepass
Handle stays on the bowldecided by looking · someone else could reasonably disagreepass
run 2 · 2r · $0.0074
run 3 · 2r · $0.0101same prompt, other modelsall 9 runs on A spoon stirring in a cup, in HTML and CSS →
Using only HTML and CSS, with no JavaScript, SVG or images, make a cup of coffee with a spoon stirring round and round inside it.Frozen at v1. This model got this and nothing else.
HTML and CSS alone, a continuous loop, and a cup seen from slightly above. The file is read for the brief and for the loop: an @keyframes rule that changes a position or a transform, named by an element, with the iteration count set to infinite. The picture is four moments of the animation, left to right, taken at 0.4 s, 1.2 s, 2.0 s and 2.8 s. Whether the rim reads as an ellipse seen from above, whether the spoon passes behind the far rim on the back half of its circuit, and whether the handle stays on the bowl are judged by eye from the page the run rendered, with the four frames as a first look. How it is scored, and this run's files on GitHub.