OpenAPI Streaming Media Types

<div class="viz"><h3>COMPLETE vs STREAM</h3><div class="row"><div class="box lane">JSON<div class="track" id="whole"><i></i></div><small>one complete body</small></div><div class="box lane">SSE<div class="events" id="events"><i></i><i></i><i></i></div><small>items arrive in order</small></div></div></div>

.viz{width:94%;height:88%;max-width:960px;padding:clamp(10px,2vmin,18px);border:1px solid var(--line);border-radius:14px;background:var(--surface);font:600 clamp(12px,1.35vw,16px)/1.35 var(--font-sans,system-ui,sans-serif);display:flex;flex-direction:column;gap:clamp(7px,1.8vmin,13px);overflow:hidden}.viz h3{margin:0;color:var(--accent);font:700 clamp(12px,1.35vw,16px)/1.2 var(--font-sans,system-ui,sans-serif);letter-spacing:.04em}.viz .row{display:flex;align-items:center;justify-content:center;gap:clamp(5px,1.4vmin,12px);flex:1;min-height:0}.viz .box{padding:clamp(5px,1.5vmin,12px);border:1px solid var(--line);border-radius:9px;background:var(--bg);text-align:center}.viz .muted{color:var(--muted)}.viz .accent{color:var(--accent)}.viz .code{font-family:ui-monospace,monospace}.viz .pill{padding:3px 7px;border:1px solid var(--line);border-radius:99px;white-space:nowrap}.viz .active{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--surface))}.viz .arrow{color:var(--accent);font:700 18px ui-monospace,monospace}.lane{width:46%;height:90%;display:flex;flex-direction:column;justify-content:space-around;gap:5px}.lane small{font-size:12px;color:var(--muted)}.track,.events{height:24px;display:flex;gap:4px}.track i,.events i{display:block;background:var(--accent);border-radius:3px;transition:opacity .25s,transform .25s}.track i{width:100%}.events i{flex:1}.events i.off,.track i.off{opacity:.12;transform:scaleY(.4)}

let n=0;function draw(){document.querySelector('#whole i').classList.toggle('off',n<3);document.querySelectorAll('#events i').forEach((el,i)=>el.classList.toggle('off',i>=n));n=(n+1)%4}draw();setInterval(draw,650)