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Add virtual chat demo with side-by-side DOM-layout comparison #46

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Add virtual chat demo with side-by-side DOM-layout comparison #46

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7770149
Add virtual chat demo
idealllee Mar 30, 2026
d65d9b6
include in build
idealllee Mar 30, 2026
ac41682
responsive default
idealllee Mar 30, 2026
10835a0
cleanup and labels
idealllee Mar 30, 2026
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5 changes: 5 additions & 0 deletions pages/demos/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -136,6 +136,11 @@ <h2>Rich Text</h2>
<h2>Masonry</h2>
<p>A text-card occlusion demo where height prediction comes from Pretext instead of DOM reads.</p>
</a>

<a class="card" href="/demos/virtual-chat">
<h2>Virtual Chat</h2>
<p>5,000 chat messages virtualized with live DOM vs Pretext measurement cost, toggleable with width and font-size sliders.</p>
</a>
</section>
</main>
</body>
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118 changes: 118 additions & 0 deletions pages/demos/virtual-chat.html
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@@ -0,0 +1,118 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Virtual Chat — DOM vs Pretext</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #0f0f0f; color: #e0e0e0; height: 100vh; overflow: hidden; display: flex; flex-direction: column; }

/* --- Controls --- */

.controls {
display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 20px;
background: #1a1a1a; border-bottom: 1px solid #282828; padding: 10px 16px; flex-shrink: 0;
}

.toggle { display: flex; align-items: center; gap: 8px; }
.toggle-label {
font-size: 11px; color: #666; text-transform: uppercase; letter-spacing: 0.6px;
transition: color 0.2s;
}
.toggle-label.active { font-weight: 600; }
.toggle-label.dom.active { color: #cc8888; }
.toggle-label.pretext.active { color: #88cc88; }

.switch { position: relative; width: 40px; height: 22px; cursor: pointer; flex-shrink: 0; }
.switch input { display: none; }
.switch .track {
position: absolute; inset: 0; border-radius: 11px;
background: #cc8888; transition: background 0.25s;
}
.switch input:checked + .track { background: #88cc88; }
.switch .thumb {
position: absolute; top: 2px; left: 2px; width: 18px; height: 18px;
border-radius: 50%; background: #fff; transition: transform 0.25s;
pointer-events: none;
}
.switch input:checked ~ .thumb { transform: translateX(18px); }

.sep { width: 1px; height: 20px; background: #282828; flex-shrink: 0; }

.slider-group { display: flex; align-items: center; gap: 6px; }
.slider-group label { font-size: 11px; color: #555; text-transform: uppercase; letter-spacing: 0.4px; }
.slider-group input[type=range] {
-webkit-appearance: none; appearance: none;
width: 100px; height: 4px; background: #333; border-radius: 2px; outline: none;
}
.slider-group input[type=range]::-webkit-slider-thumb {
-webkit-appearance: none; appearance: none;
width: 14px; height: 14px; border-radius: 50%; background: #aaa; cursor: pointer;
border: none;
}
.slider-group input[type=range]::-moz-range-thumb {
width: 14px; height: 14px; border-radius: 50%; background: #aaa; cursor: pointer;
border: none;
}
.slider-group .val {
font-size: 11px; color: #888; min-width: 34px; font-variant-numeric: tabular-nums;
text-align: right;
}

.timing {
font-size: 12px; font-weight: 600; font-variant-numeric: tabular-nums;
text-align: center; transition: color 0.2s;
}
.timing.dom { color: #cc8888; }
.timing.pretext { color: #88cc88; }

/* --- Chat --- */

.chat { flex: 1; overflow-y: auto; position: relative; margin: 0 auto; max-width: 100%; scrollbar-width: none; }
.chat::-webkit-scrollbar { display: none; }
.chat-content { position: relative; }

.msg { position: absolute; left: 0; right: 0; padding: 3px 16px; display: flex; overflow: hidden; }
.msg.sent { justify-content: flex-end; }
.msg.received { justify-content: flex-start; }

.bubble {
padding: 8px 12px; border-radius: 16px; overflow: hidden;
word-break: normal; overflow-wrap: break-word; white-space: normal;
}
.msg.sent .bubble { border-bottom-right-radius: 4px; }
.msg.received .bubble { border-bottom-left-radius: 4px; }
</style>
</head>
<body>
<div class="controls">
<div class="toggle">
<span class="toggle-label dom active">DOM</span>
<label class="switch">
<input type="checkbox" id="mode-toggle" />
<div class="track"></div>
<div class="thumb"></div>
</label>
<span class="toggle-label pretext">Pretext</span>
</div>
<div class="sep"></div>
<div class="slider-group">
<label>Width</label>
<input type="range" id="width-slider" min="250" max="900" value="600" step="1" />
<span class="val" id="width-val">600px</span>
</div>
<div class="slider-group">
<label>Font</label>
<input type="range" id="font-slider" min="11" max="28" value="15" step="1" />
<span class="val" id="font-val">15px</span>
</div>
<div class="sep"></div>
<span class="timing dom" id="timing">—</span>
</div>
<div class="chat" id="chat">
<div class="chat-content" id="chat-content"></div>
</div>
<script type="module" src="./virtual-chat.ts"></script>
</body>
</html>
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