Skateboarding astronaut catOne-line

Claude Sonnet 5.5

by Anthropicreasoning defaultClean

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Running live in a sandboxed frame. Click inside it before using the keyboard.

How it went

Total time: 1 min 25 s
Cost: $0.127
Output tokens: 12,643
Spent thinking: 3,447 tokens
Speed: 152.7 tok/s
Console errors: 0

First token after: 2.6 s
First visible text after: 36.5 s
Prompt tokens: 531
Code size: 17.3 KB
Finish reason: stop
Served by: Claude Platform on AWS
Model id: anthropic/claude-sonnet-5.5
Reasoning sent: model default
Max output: 128,000 tokens
Generated: Nov 12, 2026

What it was asked

The prompt

“draw me an SVG of an astronaut cat skateboarding on the moon”

System prompt, sent with every prompt

You are generating a self-contained web demo. It will be rendered automatically in a sandboxed iframe and compared side by side with the output of other AI models given the exact same task.

Output rules:
- Reply with exactly ONE fenced code block containing the complete file: ```html (or ```svg when the task asks for an SVG). No text before or after the code block.
- Everything must be inline: CSS in <style>, JavaScript in <script>. No external files, images, fonts or network requests, except the CDN URLs explicitly allowed by the task.
- Do not use localStorage, sessionStorage, cookies, IndexedDB, alert(), confirm(), prompt() or window.open(): they are blocked in the sandbox and will throw.
- The page must look right in a 1280×800 viewport and adapt gracefully down to 375px wide. No horizontal scrollbar.
- Something meaningful must be visible on first paint: a screenshot is taken automatically about 3 seconds after load, without any interaction.
- Everything that makes the demo interesting must be visible within the first seconds: nothing hidden behind a high score, a later level or a long play session.
- Games must start in a self-playing demo mode (a simple AI plays) behind a "Click or press a key to start" message, so the game can be judged in action without playing.
- The iframe only receives keyboard events after the user clicks it: if the demo uses the keyboard, display a clear "Click or press a key to start" message.
- The code must run with zero errors in the console of the latest Chrome.

Code run-1.svg · 305 lines

Download

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 600" width="100%" height="100%" preserveAspectRatio="xMidYMid meet">
  <title>Astronaut cat skateboarding on the moon</title>
  <defs>
    <linearGradient id="sky" x1="0" y1="0" x2="0" y2="1">
      <stop offset="0" stop-color="#05061a"/>
      <stop offset="0.6" stop-color="#14123a"/>
      <stop offset="1" stop-color="#2a2358"/>
    </linearGradient>
    <linearGradient id="ground" x1="0" y1="0" x2="0" y2="1">
      <stop offset="0" stop-color="#d3d5dc"/>
      <stop offset="1" stop-color="#8a8fa0"/>
    </linearGradient>
    <radialGradient id="earth" cx="0.35" cy="0.35" r="0.8">
      <stop offset="0" stop-color="#6cb4ff"/>
      <stop offset="0.7" stop-color="#2459c7"/>
      <stop offset="1" stop-color="#0d1f6b"/>
    </radialGradient>
    <radialGradient id="glow" cx="0.5" cy="0.5" r="0.5">
      <stop offset="0.7" stop-color="#6cb4ff" stop-opacity="0.35"/>
      <stop offset="1" stop-color="#6cb4ff" stop-opacity="0"/>
    </radialGradient>
    <radialGradient id="glass" cx="0.35" cy="0.3" r="0.8">
      <stop offset="0" stop-color="#ffffff" stop-opacity="0.35"/>
      <stop offset="0.6" stop-color="#9fd0ff" stop-opacity="0.12"/>
      <stop offset="1" stop-color="#6aa0ff" stop-opacity="0.25"/>
    </radialGradient>
    <linearGradient id="suit" x1="0" y1="0" x2="1" y2="0">
      <stop offset="0" stop-color="#ffffff"/>
      <stop offset="1" stop-color="#d4daea"/>
    </linearGradient>
    <clipPath id="earthClip"><circle cx="640" cy="120" r="48"/></clipPath>

    <!-- scrolling crater field (width 800) -->
    <g id="craters">
      <g>
        <ellipse cx="120" cy="522" rx="52" ry="11" fill="#7b8092"/>
        <ellipse cx="120" cy="525" rx="46" ry="8" fill="#6d7284"/>
        <path d="M70 524 Q120 540 170 524" stroke="#eceef3" stroke-width="3" fill="none" opacity="0.7"/>
      </g>
      <g>
        <ellipse cx="320" cy="565" rx="72" ry="15" fill="#7b8092"/>
        <ellipse cx="320" cy="569" rx="64" ry="11" fill="#6d7284"/>
        <path d="M250 568 Q320 592 390 568" stroke="#eceef3" stroke-width="3" fill="none" opacity="0.7"/>
      </g>
      <g>
        <ellipse cx="540" cy="532" rx="38" ry="8" fill="#7b8092"/>
        <ellipse cx="540" cy="534" rx="32" ry="5.5" fill="#6d7284"/>
      </g>
      <g>
        <ellipse cx="690" cy="578" rx="58" ry="12" fill="#7b8092"/>
        <ellipse cx="690" cy="581" rx="50" ry="8.5" fill="#6d7284"/>
        <path d="M635 580 Q690 596 745 580" stroke="#eceef3" stroke-width="3" fill="none" opacity="0.7"/>
      </g>
      <ellipse cx="230" cy="470" rx="26" ry="5" fill="#7b8092"/>
      <ellipse cx="450" cy="482" rx="20" ry="4" fill="#7b8092"/>
      <ellipse cx="620" cy="460" rx="30" ry="5" fill="#8a8fa1"/>
      <ellipse cx="60" cy="580" rx="16" ry="6" fill="#9a9fb0"/>
      <ellipse cx="480" cy="590" rx="14" ry="5" fill="#9a9fb0"/>
      <ellipse cx="410" cy="440" rx="12" ry="3" fill="#a3a8b8"/>
      <!-- flag -->
      <g transform="translate(740 470)">
        <line x1="0" y1="0" x2="0" y2="-62" stroke="#e8e8ee" stroke-width="3"/>
        <path d="M0 -62 L40 -62 L40 -34 L0 -34Z" fill="#ff6a3d"/>
        <circle cx="20" cy="-45" r="6" fill="#fff"/>
        <circle cx="12" cy="-54" r="2.5" fill="#fff"/><circle cx="18" cy="-57" r="2.5" fill="#fff"/>
        <circle cx="24" cy="-57" r="2.5" fill="#fff"/><circle cx="30" cy="-54" r="2.5" fill="#fff"/>
        <ellipse cx="0" cy="2" rx="9" ry="2.5" fill="#6d7284"/>
      </g>
    </g>
    <path id="hills" d="M0 424 Q100 372 200 408 T400 400 T600 388 T800 424 V440 H0Z" fill="#5b6177"/>
  </defs>

  <!-- space -->
  <rect width="800" height="600" fill="url(#sky)"/>
  <g fill="#fff">
    <circle cx="40" cy="50" r="1.5"><animate attributeName="opacity" values="1;0.2;1" dur="3s" repeatCount="indefinite"/></circle>
    <circle cx="110" cy="130" r="1"/>
    <circle cx="170" cy="40" r="2"><animate attributeName="opacity" values="0.3;1;0.3" dur="2.4s" repeatCount="indefinite"/></circle>
    <circle cx="230" cy="110" r="1.2"/>
    <circle cx="290" cy="60" r="1.5"><animate attributeName="opacity" values="1;0.3;1" dur="3.7s" repeatCount="indefinite"/></circle>
    <circle cx="350" cy="150" r="1"/>
    <circle cx="410" cy="35" r="2"><animate attributeName="opacity" values="0.4;1;0.4" dur="2.9s" repeatCount="indefinite"/></circle>
    <circle cx="470" cy="95" r="1.2"/>
    <circle cx="520" cy="180" r="1"/>
    <circle cx="560" cy="45" r="1.5"><animate attributeName="opacity" values="1;0.2;1" dur="4s" repeatCount="indefinite"/></circle>
    <circle cx="730" cy="60" r="1.8"/>
    <circle cx="760" cy="200" r="1.2"><animate attributeName="opacity" values="0.2;1;0.2" dur="3.3s" repeatCount="indefinite"/></circle>
    <circle cx="700" cy="250" r="1"/>
    <circle cx="80" cy="230" r="1.5"/>
    <circle cx="150" cy="300" r="1"><animate attributeName="opacity" values="1;0.2;1" dur="2.2s" repeatCount="indefinite"/></circle>
    <circle cx="260" cy="230" r="1.2"/>
    <circle cx="20" cy="340" r="1.2"/>
    <circle cx="380" cy="260" r="1"/>
    <circle cx="590" cy="290" r="1.3"/>
    <circle cx="760" cy="330" r="1.5"><animate attributeName="opacity" values="0.3;1;0.3" dur="3.1s" repeatCount="indefinite"/></circle>
    <circle cx="500" cy="340" r="1"/>
    <circle cx="210" cy="190" r="1"/>
  </g>
  <!-- shooting star -->
  <line x1="0" y1="0" x2="-40" y2="-14" stroke="#fff" stroke-width="2" stroke-linecap="round" opacity="0">
    <animateTransform attributeName="transform" type="translate" values="300 60;120 -4" dur="6s" repeatCount="indefinite"/>
    <animate attributeName="opacity" values="0;0;1;0;0" keyTimes="0;0.6;0.7;0.82;1" dur="6s" repeatCount="indefinite"/>
  </line>

  <!-- Earth -->
  <circle cx="640" cy="120" r="75" fill="url(#glow)"/>
  <circle cx="640" cy="120" r="48" fill="url(#earth)"/>
  <g clip-path="url(#earthClip)" fill="#4caf63" opacity="0.9">
    <path d="M610 90 Q625 70 645 82 Q655 95 640 108 Q630 125 615 115 Q600 105 610 90Z"/>
    <path d="M655 130 Q675 120 685 140 Q678 165 662 158 Q650 148 655 130Z"/>
    <path d="M600 140 Q612 135 618 150 Q610 165 602 155Z"/>
    <ellipse cx="640" cy="75" rx="22" ry="5" fill="#fff" opacity="0.55"/>
    <ellipse cx="660" cy="110" rx="18" ry="4" fill="#fff" opacity="0.45"/>
    <circle cx="665" cy="140" r="46" fill="#000" opacity="0.28"/>
  </g>

  <!-- far hills (slow parallax) -->
  <g>
    <use href="#hills" x="0"/>
    <use href="#hills" x="800"/>
    <animateTransform attributeName="transform" type="translate" from="0 0" to="-800 0" dur="24s" repeatCount="indefinite"/>
  </g>

  <!-- ground -->
  <rect x="0" y="420" width="800" height="180" fill="url(#ground)"/>
  <rect x="0" y="420" width="800" height="3" fill="#f2f3f7" opacity="0.6"/>

  <g>
    <use href="#craters" x="0"/>
    <use href="#craters" x="800"/>
    <animateTransform attributeName="transform" type="translate" from="0 0" to="-800 0" dur="5s" repeatCount="indefinite"/>
  </g>

  <!-- shadow -->
  <ellipse cx="400" cy="494" rx="90" ry="9" fill="#2a2d3d" opacity="0.45">
    <animate attributeName="rx" values="90;62;90" keyTimes="0;0.5;1" dur="2.6s" repeatCount="indefinite"/>
    <animate attributeName="opacity" values="0.45;0.22;0.45" keyTimes="0;0.5;1" dur="2.6s" repeatCount="indefinite"/>
  </ellipse>

  <!-- dust puffs -->
  <g fill="#e6e8ee">
    <circle cx="320" cy="486" r="5" opacity="0">
      <animate attributeName="cx" values="320;240" dur="1.2s" repeatCount="indefinite"/>
      <animate attributeName="cy" values="486;466" dur="1.2s" repeatCount="indefinite"/>
      <animate attributeName="r" values="4;14" dur="1.2s" repeatCount="indefinite"/>
      <animate attributeName="opacity" values="0.7;0" dur="1.2s" repeatCount="indefinite"/>
    </circle>
    <circle cx="320" cy="486" r="5" opacity="0">
      <animate attributeName="cx" values="320;240" dur="1.2s" begin="0.4s" repeatCount="indefinite"/>
      <animate attributeName="cy" values="486;466" dur="1.2s" begin="0.4s" repeatCount="indefinite"/>
      <animate attributeName="r" values="4;14" dur="1.2s" begin="0.4s" repeatCount="indefinite"/>
      <animate attributeName="opacity" values="0.7;0" dur="1.2s" begin="0.4s" repeatCount="indefinite"/>
    </circle>
    <circle cx="320" cy="486" r="5" opacity="0">
      <animate attributeName="cx" values="320;240" dur="1.2s" begin="0.8s" repeatCount="indefinite"/>
      <animate attributeName="cy" values="486;466" dur="1.2s" begin="0.8s" repeatCount="indefinite"/>
      <animate attributeName="r" values="4;14" dur="1.2s" begin="0.8s" repeatCount="indefinite"/>
      <animate attributeName="opacity" values="0.7;0" dur="1.2s" begin="0.8s" repeatCount="indefinite"/>
    </circle>
  </g>

  <!-- ===== SKATER (hop) ===== -->
  <g>
    <animateTransform attributeName="transform" type="translate"
      values="0 0;0 -85;0 0" keyTimes="0;0.5;1" calcMode="spline"
      keySplines="0.2 0.6 0.5 1;0.5 0 0.8 0.4" dur="2.6s" repeatCount="indefinite"/>
    <g>
      <animateTransform attributeName="transform" type="rotate"
        values="-2 400 460;5 400 460;-2 400 460" dur="2.6s" repeatCount="indefinite"/>

      <!-- tail -->
      <g>
        <animateTransform attributeName="transform" type="rotate" values="-5 365 405;8 365 405;-5 365 405" dur="1.3s" repeatCount="indefinite"/>
        <path d="M365 405 C300 415 280 360 312 322" stroke="#c97a2b" stroke-width="20" fill="none" stroke-linecap="round"/>
        <path d="M365 405 C300 415 280 360 312 322" stroke="#f2a65a" stroke-width="14" fill="none" stroke-linecap="round"/>
        <path d="M296 352 l12 -4 M293 372 l13 -2 M301 335 l11 -6" stroke="#b5651c" stroke-width="4" stroke-linecap="round"/>
        <circle cx="312" cy="322" r="7" fill="#fff4e0"/>
      </g>

      <!-- backpack -->
      <rect x="432" y="318" width="52" height="82" rx="14" fill="#8e99b4" stroke="#6c7694" stroke-width="3"/>
      <rect x="442" y="330" width="32" height="10" rx="4" fill="#5b6683"/>
      <circle cx="458" cy="358" r="6" fill="#ff5d5d"/>
      <circle cx="458" cy="376" r="6" fill="#5dd6ff"/>

      <!-- back arm (right) -->
      <path d="M440 338 Q480 340 510 358" stroke="#aab3cb" stroke-width="28" fill="none" stroke-linecap="round"/>
      <path d="M440 338 Q480 340 510 358" stroke="#eef1f8" stroke-width="22" fill="none" stroke-linecap="round"/>
      <circle cx="516" cy="361" r="15" fill="#ff8a3d" stroke="#c4601c" stroke-width="3"/>

      <!-- legs -->
      <path d="M382 410 Q360 428 356 444" stroke="#aab3cb" stroke-width="32" fill="none" stroke-linecap="round"/>
      <path d="M382 410 Q360 428 356 444" stroke="#f4f6fb" stroke-width="26" fill="none" stroke-linecap="round"/>
      <path d="M420 410 Q446 428 448 444" stroke="#aab3cb" stroke-width="32" fill="none" stroke-linecap="round"/>
      <path d="M420 410 Q446 428 448 444" stroke="#f4f6fb" stroke-width="26" fill="none" stroke-linecap="round"/>
      <!-- boots -->
      <path d="M326 452 L326 442 Q326 432 340 432 L368 432 Q376 436 374 452Z" fill="#ff8a3d" stroke="#c4601c" stroke-width="3" stroke-linejoin="round"/>
      <path d="M426 452 L426 436 Q428 432 440 432 L462 432 Q474 436 474 452Z" fill="#ff8a3d" stroke="#c4601c" stroke-width="3" stroke-linejoin="round"/>

      <!-- torso -->
      <ellipse cx="400" cy="368" rx="50" ry="62" fill="url(#suit)" stroke="#aab3cb" stroke-width="3"/>
      <rect x="376" y="348" width="48" height="32" rx="7" fill="#5b6683"/>
      <circle cx="388" cy="358" r="4" fill="#ff5d5d"><animate attributeName="opacity" values="1;0.3;1" dur="1s" repeatCount="indefinite"/></circle>
      <circle cx="400" cy="358" r="4" fill="#ffd84d"/>
      <circle cx="412" cy="358" r="4" fill="#5dffa0"/>
      <rect x="384" y="368" width="32" height="6" rx="3" fill="#9fd0ff"/>
      <path d="M352 392 Q400 412 448 392" stroke="#aab3cb" stroke-width="3" fill="none"/>

      <!-- front arm (left) -->
      <path d="M362 338 Q325 330 292 318" stroke="#aab3cb" stroke-width="28" fill="none" stroke-linecap="round"/>
      <path d="M362 338 Q325 330 292 318" stroke="#f4f6fb" stroke-width="22" fill="none" stroke-linecap="round"/>
      <circle cx="285" cy="315" r="15" fill="#ff8a3d" stroke="#c4601c" stroke-width="3"/>

      <!-- neck ring -->
      <ellipse cx="400" cy="324" rx="50" ry="13" fill="#8e99b4" stroke="#6c7694" stroke-width="3"/>

      <!-- cat head -->
      <g>
        <path d="M356 262 L356 210 L394 238Z" fill="#f2a65a" stroke="#c97a2b" stroke-width="3" stroke-linejoin="round"/>
        <path d="M444 262 L444 210 L406 238Z" fill="#f2a65a" stroke="#c97a2b" stroke-width="3" stroke-linejoin="round"/>
        <path d="M364 248 L364 226 L382 239Z" fill="#ff9fb4"/>
        <path d="M436 248 L436 226 L418 239Z" fill="#ff9fb4"/>
        <ellipse cx="400" cy="274" rx="46" ry="40" fill="#f2a65a" stroke="#c97a2b" stroke-width="3"/>
        <path d="M400 236 V252 M388 238 L390 250 M412 238 L410 250" stroke="#b5651c" stroke-width="4" stroke-linecap="round"/>
        <path d="M356 270 l12 3 M356 282 l12 -1" stroke="#b5651c" stroke-width="4" stroke-linecap="round"/>
        <path d="M444 270 l-12 3 M444 282 l-12 -1" stroke="#b5651c" stroke-width="4" stroke-linecap="round"/>
        <ellipse cx="400" cy="294" rx="26" ry="17" fill="#fff4e0"/>
        <!-- eyes -->
        <g>
          <animateTransform attributeName="transform" type="translate" values="0 0;0 0" dur="1s" repeatCount="indefinite"/>
          <g transform="translate(382 268)">
            <g>
              <animateTransform attributeName="transform" type="scale" values="1 1;1 1;1 0.1;1 1;1 1" keyTimes="0;0.9;0.94;0.98;1" dur="3.5s" repeatCount="indefinite"/>
              <ellipse rx="9" ry="11" fill="#fff" stroke="#6b4a22" stroke-width="2"/>
              <ellipse cx="1" cy="1" rx="5.5" ry="8" fill="#2a1a0a"/>
              <circle cx="-1" cy="-3" r="2.6" fill="#fff"/>
            </g>
          </g>
          <g transform="translate(418 268)">
            <g>
              <animateTransform attributeName="transform" type="scale" values="1 1;1 1;1 0.1;1 1;1 1" keyTimes="0;0.9;0.94;0.98;1" dur="3.5s" repeatCount="indefinite"/>
              <ellipse rx="9" ry="11" fill="#fff" stroke="#6b4a22" stroke-width="2"/>
              <ellipse cx="1" cy="1" rx="5.5" ry="8" fill="#2a1a0a"/>
              <circle cx="-1" cy="-3" r="2.6" fill="#fff"/>
            </g>
          </g>
        </g>
        <path d="M394 287 L406 287 L400 294Z" fill="#ff7b9c" stroke="#d6486e" stroke-width="1.5" stroke-linejoin="round"/>
        <path d="M400 294 V298 M400 298 Q392 306 385 298 M400 298 Q408 306 415 298" stroke="#6b4a22" stroke-width="2.2" fill="none" stroke-linecap="round"/>
        <!-- whiskers -->
        <g stroke="#6b4a22" stroke-width="1.6" stroke-linecap="round" opacity="0.8">
          <path d="M374 292 L350 286 M374 297 L350 300"/>
          <path d="M426 292 L450 286 M426 297 L450 300"/>
        </g>
      </g>

      <!-- helmet glass -->
      <circle cx="400" cy="272" r="64" fill="url(#glass)" stroke="#dfe6f5" stroke-width="7"/>
      <circle cx="400" cy="272" r="64" fill="none" stroke="#8e99b4" stroke-width="2" opacity="0.7"/>
      <path d="M362 236 Q376 216 404 212" stroke="#fff" stroke-width="7" fill="none" stroke-linecap="round" opacity="0.85"/>
      <circle cx="355" cy="252" r="4" fill="#fff" opacity="0.8"/>
      <!-- helmet light -->
      <rect x="454" y="262" width="14" height="22" rx="5" fill="#ffd84d" stroke="#c49a10" stroke-width="2"/>
      <!-- antenna -->
      <line x1="448" y1="224" x2="466" y2="190" stroke="#8e99b4" stroke-width="4" stroke-linecap="round"/>
      <circle cx="467" cy="188" r="6" fill="#ff5d5d"><animate attributeName="opacity" values="1;0.2;1" dur="1.2s" repeatCount="indefinite"/></circle>

      <!-- skateboard -->
      <g>
        <rect x="334" y="458" width="22" height="8" rx="2" fill="#8a8fa0"/>
        <rect x="444" y="458" width="22" height="8" rx="2" fill="#8a8fa0"/>
        <path d="M296 436 Q302 454 326 454 L474 454 Q498 454 504 436" stroke="#2b2438" stroke-width="13" fill="none" stroke-linecap="round" stroke-linejoin="round"/>
        <path d="M296 436 Q302 454 326 454 L474 454 Q498 454 504 436" stroke="#ff4f6d" stroke-width="9" fill="none" stroke-linecap="round" stroke-linejoin="round"/>
        <path d="M330 451 L470 451" stroke="#ff9fb4" stroke-width="2" stroke-linecap="round"/>
        <path d="M385 454 l10 -2 l10 2" stroke="#fff" stroke-width="2" fill="none" opacity="0"/>
        <g>
          <circle cx="345" cy="474" r="14" fill="#2b2438"/>
          <circle cx="345" cy="474" r="8" fill="#5dd6ff"/>
          <g>
            <animateTransform attributeName="transform" type="rotate" from="0 345 474" to="360 345 474" dur="0.6s" repeatCount="indefinite"/>
            <path d="M345 467 V481 M338 474 H352" stroke="#2b2438" stroke-width="2.5"/>
          </g>
        </g>
        <g>
          <circle cx="455" cy="474" r="14" fill="#2b2438"/>
          <circle cx="455" cy="474" r="8" fill="#5dd6ff"/>
          <g>
            <animateTransform attributeName="transform" type="rotate" from="0 455 474" to="360 455 474" dur="0.6s" repeatCount="indefinite"/>
            <path d="M455 467 V481 M448 474 H462" stroke="#2b2438" stroke-width="2.5"/>
          </g>
        </g>
      </g>
    </g>
  </g>

  <!-- foreground sparkle stars -->
  <g fill="#fff" opacity="0.9">
    <path d="M120 200 l3 -9 l3 9 l9 3 l-9 3 l-3 9 l-3 -9 l-9 -3Z">
      <animateTransform attributeName="transform" type="rotate" from="0 120 203" to="360 120 203" dur="8s" repeatCount="indefinite"/>
    </path>
    <path d="M700 330 l2 -6 l2 6 l6 2 l-6 2 l-2 6 l-2 -6 l-6 -2Z" opacity="0.8">
      <animate attributeName="opacity" values="0.2;1;0.2" dur="2.5s" repeatCount="indefinite"/>
    </path>
  </g>
</svg>

Reasoning trace (3,447 tokens)

I'm planning an SVG of an astronaut cat skateboarding on the moon, to be returned as a single svg code block with animation. The canvas will be 800 by 600, with a starry gradient sky, Earth in the distance, and a cratered lunar surface with hills. I'm also sketching the cat's helmet as a translucent circle and wondering whether its ears should poke through it.

Still writing the SVG markup...

Next I'm making the craters a repeating group that scrolls across the surface, keeping them away from the edges so the loop stays seamless. The far hills will scroll more slowly for a parallax effect. For the cat, I'm planning a hop with a gentle arc, and a small rotation on the skateboard in mid-air.

Still writing the skateboard and wheel details...

Still writing the skateboard shadow and body...

Still writing the cat's arms and backpack...

Still writing the cat's head and backpack details...

Still working on the cat's face and helmet: eyes, nose, whiskers, and the muzzle, then the neck ring under the helmet and how the glass overlaps the torso.

Tail, ears and helmet details are settled now: the tail curls out from behind the suit with a slight wobble, and I'm leaving out extra extras like a planted flag to keep the scene simple.

Next I'm adding a small planted flag in the scrolling group, plus some dust puffs behind the board that drift left and fade, and around thirty stars for the sky.

Still writing the crater and hill details...

Still writing the ground and hills...

Still writing the animation timing and the shadow scaling...

Still writing the SVG code, wrapping up with the viewBox and the background fill.