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<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Web graph embeddings — 2D map (streaming)</title>
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/* ── region select ─────────────────────────────────────────────────────────────────────── */
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</head>
<body>
<div id="stage"><canvas id="cv" aria-label="2D map of host embeddings"></canvas></div>
<section id="rail" class="panel" aria-label="Controls">
<div class="brand"><h1>Web graph embeddings</h1><span class="n" id="nnodes">—</span></div>
<p class="lede" id="lede">The link-prediction embeddings, projected to 2D and streamed by tile.
Structure the model learned is the shape you see. Recolor to ask which properties it separates.</p>
<div class="grp">
<span class="lbl">Color by <button id="helpbtn" type="button"
aria-label="What the colours mean" title="What the colours mean">?</button></span>
<div class="seg" id="colorby" role="group" aria-label="Color by"></div>
</div>
<div class="grp search">
<span class="lbl" id="findlbl">Find a top-20k host</span>
<input id="q" type="search" placeholder="search hostname…" autocomplete="off" spellcheck="false" />
<ul id="hits" role="listbox" aria-label="Search results"></ul>
</div>
</section>
<aside id="legend" class="panel" aria-label="Legend"></aside>
<div id="toprail">
<div id="selpill" class="panel">
<button id="seln" type="button" aria-expanded="false" aria-controls="sel"></button>
<button id="selclr" type="button" title="Clear selection (Esc)"
aria-label="Clear selection">×</button>
</div>
<div id="spin" role="status" aria-label="Loading tiles" aria-hidden="true"></div>
</div>
<div id="selbox" aria-hidden="true"></div>
<section id="sel" class="panel" role="dialog" aria-labelledby="seltitle">
<header><h2 id="seltitle">Selected hosts</h2><button id="selx" type="button"
aria-label="Close list">×</button></header>
<p class="sub" id="selsub"></p>
<div class="selrow selhd" id="selhd"></div>
<div id="selrows"></div>
<footer id="selfoot"></footer>
</section>
<div id="scrim" hidden></div>
<section id="help" class="panel" role="dialog" aria-modal="true" aria-labelledby="helptitle" hidden>
<header><h2 id="helptitle">What the colours mean</h2><button id="helpx" type="button"
aria-label="Close">×</button></header>
<div id="helpbody"></div>
<footer>The model never saw any of these properties — only anonymous host ids and the links
between them. Any structure here was learned from links alone.
<a href="https://huggingface.co/datasets/commoncrawl/web-graph-embeddings"
target="_blank" rel="noopener">Dataset</a> ·
<a href="https://github.com/commoncrawl/web-graph-embeddings"
target="_blank" rel="noopener">Code</a></footer>
</section>
<div id="tip" role="tooltip"></div>
<div id="hud" class="panel">
<span><b id="fps">—</b> fps</span><span><b id="tiles">0</b> tiles</span>
<span>zoom <b id="zoom">1.0×</b></span>
<button id="selarm" aria-pressed="false"
title="Drag a rectangle to select hosts (or hold Shift and drag)">select</button>
<button id="reset" title="Reset the view, the selection and the pinned host">reset</button>
</div>
<div id="err"><div id="errmsg"></div></div>
<script>
(function () {
"use strict";
const $ = (id) => document.getElementById(id);
function fail(msg) { $("errmsg").textContent = msg; $("err").style.display = "grid"; }
const params = new URLSearchParams(location.search);
const BASE = (params.get("base") || ".").replace(/\/$/, ""); // tile root; default = page dir
// ── palettes ──────────────────────────────────────────────────────────────────────────────
// 24-colour categorical palette, greedy farthest-point ordered so the most frequent classes
// (rank 0,1,2,…) are the most distinct; legible on both dark and light grounds.
const CAT = [
[85, 158, 231], [237, 70, 29], [29, 237, 29], [240, 76, 208],
[190, 211, 105], [29, 237, 153], [142, 76, 240], [133, 237, 29],
[200, 65, 119], [237, 174, 29], [223, 144, 152], [105, 211, 115],
[29, 237, 237], [184, 144, 223], [65, 92, 200], [144, 207, 223],
[200, 119, 65], [90, 226, 185], [65, 200, 65], [29, 133, 237],
[244, 123, 244], [29, 237, 91], [184, 218, 47], [186, 65, 200],
];
const UNLAB = [110, 120, 135];
function rampColor(t) {
t = Math.max(0, Math.min(1, t));
const stops = [[36, 52, 96], [50, 130, 190], [86, 199, 245], [255, 180, 84]];
const s = t * (stops.length - 1); const i = Math.floor(s), f = s - i;
const a = stops[i], b = stops[Math.min(i + 1, stops.length - 1)];
return [a[0] + (b[0] - a[0]) * f, a[1] + (b[1] - a[1]) * f, a[2] + (b[2] - a[2]) * f];
}
const DIM = 26; // dimmed alpha (~10%) for filtered-out nodes
let DEG_BUCKETS = 6;
function degBucket(b) { return Math.min(DEG_BUCKETS - 1, Math.floor(b / (256 / DEG_BUCKETS))); }
function fmtN(n) {
n = Math.round(n);
if (n >= 1e6) return (n / 1e6).toFixed(1) + "M";
if (n >= 1e3) return (n / 1e3).toFixed(n >= 1e4 ? 0 : 1) + "k";
return "" + n;
}
// ── WebGL ─────────────────────────────────────────────────────────────────────────────────
const cv = $("cv");
const gl = cv.getContext("webgl", { antialias: true, alpha: false, premultipliedAlpha: false });
if (!gl) { fail("This viewer needs WebGL, which your browser has disabled."); return; }
function sh(type, src) {
const s = gl.createShader(type); gl.shaderSource(s, src); gl.compileShader(s);
if (!gl.getShaderParameter(s, gl.COMPILE_STATUS)) throw new Error(gl.getShaderInfoLog(s));
return s;
}
const prog = gl.createProgram();
gl.attachShader(prog, sh(gl.VERTEX_SHADER, `
attribute vec2 a_xy; attribute vec3 a_col; attribute float a_deg; attribute float a_alpha;
uniform vec2 u_scale; uniform vec2 u_off; uniform float u_pt; uniform float u_ptMin; uniform float u_matchOnly;
varying vec3 v_col; varying float v_alpha;
void main() {
vec2 p = a_xy * u_scale + u_off;
gl_Position = vec4(p, 0.0, 1.0);
gl_PointSize = max(u_ptMin, u_pt * (0.65 + 1.9 * a_deg));
v_col = a_col; v_alpha = a_alpha;
// foreground pass: draw only the filter-matched points (alpha==1), cull the dimmed rest
if (u_matchOnly > 0.5 && a_alpha < 0.99) { gl_PointSize = 0.0; gl_Position = vec4(2.0, 2.0, 2.0, 1.0); }
}`));
gl.attachShader(prog, sh(gl.FRAGMENT_SHADER, `
precision mediump float; varying vec3 v_col; varying float v_alpha; uniform float u_alpha;
void main() {
vec2 d = gl_PointCoord - 0.5; float r = dot(d, d);
if (r > 0.25) discard;
float a = smoothstep(0.25, 0.14, r);
gl_FragColor = vec4(v_col, a * u_alpha * v_alpha);
}`));
gl.linkProgram(prog);
if (!gl.getProgramParameter(prog, gl.LINK_STATUS)) { fail("Shader link failed."); return; }
gl.useProgram(prog);
const A = {
xy: gl.getAttribLocation(prog, "a_xy"), col: gl.getAttribLocation(prog, "a_col"),
deg: gl.getAttribLocation(prog, "a_deg"), alpha: gl.getAttribLocation(prog, "a_alpha"),
};
const U = {
scale: gl.getUniformLocation(prog, "u_scale"), off: gl.getUniformLocation(prog, "u_off"),
pt: gl.getUniformLocation(prog, "u_pt"), alpha: gl.getUniformLocation(prog, "u_alpha"),
ptMin: gl.getUniformLocation(prog, "u_ptMin"), matchOnly: gl.getUniformLocation(prog, "u_matchOnly"),
};
gl.enableVertexAttribArray(A.xy); gl.enableVertexAttribArray(A.col);
gl.enableVertexAttribArray(A.deg); gl.enableVertexAttribArray(A.alpha);
// ── state ─────────────────────────────────────────────────────────────────────────────────
let META = null, N = 0, nCat = 0, active = 0, filterVal = -1, defaultSet = 0;
let view = { s: 0.9, cx: 0, cy: 0 };
let asp = 1, dpr = Math.min(window.devicePixelRatio || 1, 2), dirty = true;
const tileMeta = new Map(); // id -> manifest tile {id,z,n,bbox}
const colorRank = {}; // setIdx -> [classIdx -> frequency rank] for CAT color
const ready = new Map(); // id -> loaded tile object
let activeIds = new Set();
const MAXKEEP = 600; // evict non-visible tiles beyond this many
let inflight = 0; const MAXFETCH = 8; const queue = [];
let pin = null; // {id, li} pinned/searched node
// ── region-select state ─────────────────────────────────────────────────────────────────────
// The rect lives in WORLD coords, so a selection survives pan/zoom untouched. ``epoch`` is the
// cancellation token: every await in the scan re-reads it and bails if a newer rect superseded it.
const Q = 32767; // int16 quantum — matches embed_2d_tile._quantize_xy
const EPS = 1e-4; // bbox slack; see classify()
const sel = { rect: null, cls: null, count: 0, done: 0, todo: 0, errs: 0,
exact: false, epoch: 0, partN: new Map() };
let scanSig = null; // AbortController for the in-flight scan
let band = null; // live rubber-band drag, screen px
let selArmed = false, sheetOpen = false;
const list = { band: 0, buf: null, tiles: [], pos: 0, rows: 0,
eof: false, busy: false, approx: false };
// Scan tiles are cached SEPARATELY from ``ready``: that path uploads 4 GL buffers per tile and
// evicts at MAXKEEP, so routing a scan through it would evict the map and thrash GPU memory.
const scanCache = new Map(), nameCache = new Map(); // Map order == LRU (touch = delete + set)
const scanWait = new Map(), nameWait = new Map(); // in-flight dedupe
let scanBytes = 0, nameBytes = 0;
const SCAN_BYTES_MAX = 96 << 20, NAME_BYTES_MAX = 48 << 20;
const SCAN_FETCH = 6; // < MAXFETCH so rendering keeps fetch priority
const PAGE = 200, LIST_MAX = 10000, BAND_MAX = 3e6;
// ── boot: fetch manifest ────────────────────────────────────────────────────────────────────
fetch(BASE + "/manifest.json").then((r) => {
if (!r.ok) throw new Error("manifest.json " + r.status);
return r.json();
}).then((m) => { META = m; boot(); }).catch((e) =>
fail("Could not load manifest.json from " + BASE + " — serve this folder over HTTP "
+ "(python -m http.server) and open the page from there. (" + e.message + ")"));
function boot() {
N = META.n; DEG_BUCKETS = META.degBuckets || 6;
nCat = META.labelSets.filter((l) => l.kind === "cat").length;
META.tiles.forEach((t) => tileMeta.set(t.id, t));
// colors follow frequency rank (most frequent class -> CAT[0]) so the top classes are distinct
META.labelSets.forEach((ls, i) => {
if (ls.kind !== "cat") return;
const cnt = ls.counts || ls.classes.map(() => 0);
const rank = new Array(ls.classes.length);
ls.classes.map((_, k) => k).sort((a, b) => cnt[b] - cnt[a]).forEach((k, pos) => { rank[k] = pos; });
colorRank[i] = rank;
});
$("nnodes").textContent = N >= 1e6 ? (N / 1e6).toFixed(N % 1e6 ? 1 : 0) + "M"
: (N / 1e3).toFixed(0) + "k";
if (META.lede) $("lede").innerHTML = META.lede; // trusted manifest string (may contain a link)
defaultSet = Math.max(0, META.labelSets.findIndex((l) => l.name === "language")); // color by language on load
const nSearch = (META.search || []).length; // label the search box with its actual coverage
if (nSearch) $("findlbl").textContent = "Find a top-" + fmtN(nSearch) + " host";
buildColorBy(); buildSearch(); buildSelHead();
resize(); recolor(defaultSet); requestAnimationFrame(loop);
}
// ── tile loading ────────────────────────────────────────────────────────────────────────────
function pump() {
while (inflight < MAXFETCH && queue.length) { const id = queue.shift(); doLoad(id); }
}
function startLoad(id) {
if (ready.has(id) || queue.includes(id)) return;
ready.set(id, { id, status: "queued" }); queue.push(id); pump();
}
function doLoad(id) {
const t = ready.get(id); const meta = tileMeta.get(id); if (!t || !meta) return;
// tiles are sharded into t/<d>/ subdirs (manifest ``d``); fall back to flat t/ for old manifests
const tdir = "/t/" + (meta.d != null ? meta.d + "/" : "") + id;
t.status = "loading"; inflight++;
fetch(BASE + tdir + ".bin").then((r) => r.arrayBuffer()).then((buf) => {
const K = meta.n; let o = 0;
t.n = K;
t.xy = new Int16Array(buf, o, K * 2); o += K * 4;
t.labs = [];
for (let c = 0; c < nCat; c++) { t.labs.push(new Uint8Array(buf, o, K)); o += K; }
t.deg = new Uint8Array(buf, o, K); o += K;
t.bXY = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, t.bXY);
gl.bufferData(gl.ARRAY_BUFFER, t.xy, gl.STATIC_DRAW);
t.bDeg = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, t.bDeg);
gl.bufferData(gl.ARRAY_BUFFER, t.deg, gl.STATIC_DRAW);
t.bCol = gl.createBuffer(); t.bAlpha = gl.createBuffer();
t.names = null;
colorTile(t); alphaTile(t);
t.status = "ready"; dirty = true;
if (META.hasNames) fetch(BASE + tdir + ".nm").then((r) => r.text())
.then((txt) => { t.names = txt.length ? txt.split("\n") : []; });
}).catch(() => { ready.delete(id); }).finally(() => { inflight--; pump(); });
}
function evictTile(t) {
if (t.bXY) gl.deleteBuffer(t.bXY); if (t.bDeg) gl.deleteBuffer(t.bDeg);
if (t.bCol) gl.deleteBuffer(t.bCol); if (t.bAlpha) gl.deleteBuffer(t.bAlpha);
}
function colorTile(t) {
if (t.status === "queued" || !t.deg) return;
const set = META.labelSets[active], K = t.n, buf = new Uint8Array(K * 3);
if (set.kind === "degree") {
for (let i = 0; i < K; i++) { const c = rampColor(t.deg[i] / 255), j = i * 3;
buf[j] = c[0]; buf[j + 1] = c[1]; buf[j + 2] = c[2]; }
} else {
const lab = t.labs[active], rank = colorRank[active];
for (let i = 0; i < K; i++) { const v = lab[i], c = v === 255 ? UNLAB : CAT[rank[v] % CAT.length];
const j = i * 3; buf[j] = c[0]; buf[j + 1] = c[1]; buf[j + 2] = c[2]; }
}
gl.bindBuffer(gl.ARRAY_BUFFER, t.bCol); gl.bufferData(gl.ARRAY_BUFFER, buf, gl.STATIC_DRAW);
}
function alphaTile(t) {
if (t.status === "queued" || !t.deg) return;
const set = META.labelSets[active], K = t.n, buf = new Uint8Array(K);
if (filterVal < 0) {
buf.fill(255);
} else if (set.kind === "degree") {
for (let i = 0; i < K; i++) buf[i] = degBucket(t.deg[i]) === filterVal ? 255 : DIM;
} else {
const lab = t.labs[active];
for (let i = 0; i < K; i++) buf[i] = lab[i] === filterVal ? 255 : DIM;
}
gl.bindBuffer(gl.ARRAY_BUFFER, t.bAlpha); gl.bufferData(gl.ARRAY_BUFFER, buf, gl.DYNAMIC_DRAW);
}
// ── LOD + viewport → which tiles are active ─────────────────────────────────────────────────
// LOD = highest degree band shown at the current zoom. The bands themselves are baked into the
// tiles; this only controls WHEN each appears. LOD_RATE = bands revealed per zoom-doubling (lower
// ⇒ low-degree hosts hold off until you zoom deeper); LOD_BIAS = bands the overview already shows.
const LOD_RATE = 0.7, LOD_BIAS = 0.4;
function lodLevel() {
return Math.max(0, Math.min(META.zMax, Math.round(Math.log2(view.s) * LOD_RATE + LOD_BIAS)));
}
// one screen<->world projection for hover-pick and region-select (the wheel handler keeps its
// own inline copy: it needs the intermediate NDC to anchor the zoom on the cursor)
function toWorld(px, py) {
const w = cv.clientWidth, h = cv.clientHeight;
return { x: ((px / w) * 2 - 1) / (view.s * asp) + view.cx,
y: (1 - (py / h) * 2) / view.s + view.cy };
}
function toScreenX(wx) { return ((wx - view.cx) * view.s * asp + 1) * cv.clientWidth / 2; }
function toScreenY(wy) { return (1 - (wy - view.cy) * view.s) * cv.clientHeight / 2; }
function viewport() {
const hw = 1 / (view.s * asp), hh = 1 / view.s, m = 0.25; // 25% prefetch margin
return [view.cx - hw * (1 + m), view.cy - hh * (1 + m),
view.cx + hw * (1 + m), view.cy + hh * (1 + m)];
}
function updateActive() {
// Tiles loaded = current LOD band + viewport, ALWAYS (a filter never changes this). Filtering
// only dims the non-matching points among what this zoom already shows — it must not pull in the
// low-degree hosts that are meant to stay hidden until you zoom in.
const maxZ = lodLevel(), vp = viewport(); activeIds = new Set();
for (const t of META.tiles) {
if (t.z > maxZ) continue;
const b = t.bbox;
if (b[0] < vp[2] && b[2] > vp[0] && b[1] < vp[3] && b[3] > vp[1]) {
activeIds.add(t.id); if (!ready.has(t.id)) startLoad(t.id);
}
}
if (ready.size > MAXKEEP) { // drop non-visible tiles to bound GPU memory
for (const [id, t] of ready) {
if (ready.size <= MAXKEEP) break;
if (!activeIds.has(id) && t.status === "ready") { evictTile(t); ready.delete(id); }
}
}
}
// ── draw ────────────────────────────────────────────────────────────────────────────────────
function drawTiles() { // bind + draw each ready active tile; returns count
let drawn = 0;
for (const id of activeIds) {
const t = ready.get(id); if (!t || t.status !== "ready") continue;
gl.bindBuffer(gl.ARRAY_BUFFER, t.bXY); gl.vertexAttribPointer(A.xy, 2, gl.SHORT, true, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, t.bCol); gl.vertexAttribPointer(A.col, 3, gl.UNSIGNED_BYTE, true, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, t.bDeg); gl.vertexAttribPointer(A.deg, 1, gl.UNSIGNED_BYTE, true, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, t.bAlpha); gl.vertexAttribPointer(A.alpha, 1, gl.UNSIGNED_BYTE, true, 0, 0);
gl.drawArrays(gl.POINTS, 0, t.n); drawn++;
}
return drawn;
}
function draw() {
const bg = getComputedStyle(document.body).backgroundColor.match(/\d+/g) || [11, 14, 21];
gl.clearColor(bg[0] / 255, bg[1] / 255, bg[2] / 255, 1); gl.clear(gl.COLOR_BUFFER_BIT);
gl.enable(gl.BLEND); gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
gl.uniform2f(U.scale, view.s * asp, view.s);
gl.uniform2f(U.off, -view.cx * view.s * asp, -view.cy * view.s);
// point size = a hump in log-zoom: grow through the hub-only overview (declutter), then SHRINK
// once LOD reveals the dense low-degree crowd at high zoom (screen density peaks there, so smaller
// dots keep the map readable). Peaks ~4× zoom, decays toward a 2px floor at 150–500×+.
const L = Math.log2(view.s);
gl.uniform1f(U.pt, Math.max(1.2, dpr * (2.0 + 5.0 * Math.exp(-(L - 2.0) * (L - 2.0) / 8.0))));
// floor on-screen size so points stay visible when zoomed way in: off through the good low/mid
// zoom (≤~22×), then ramps in to a 10px minimum by ~128× (per-point max, so it lifts only the
// too-small dots rather than inflating the whole map).
gl.uniform1f(U.ptMin, dpr * 10 * Math.min(1, Math.max(0, (L - 4.6) / 2.4)));
// pass 1: whole scene (filtered-out points already dimmed to ~10% via per-vertex alpha)
gl.uniform1f(U.matchOnly, 0);
gl.uniform1f(U.alpha, N > 4e6 ? 0.5 : 0.75);
const drawn = drawTiles();
// pass 2 (filter active): redraw only the matched points, opaque and on top (foreground)
if (filterVal >= 0) {
gl.uniform1f(U.matchOnly, 1);
gl.uniform1f(U.alpha, N > 4e6 ? 0.9 : 1.0);
drawTiles();
gl.uniform1f(U.matchOnly, 0);
}
$("tiles").textContent = drawn;
if (pin) drawPin();
syncSelBox();
}
const bPin = gl.createBuffer();
function drawPin() {
const t = ready.get(pin.id); if (!t || t.status !== "ready") return;
gl.bindBuffer(gl.ARRAY_BUFFER, bPin);
gl.bufferData(gl.ARRAY_BUFFER, new Int16Array([t.xy[pin.li * 2], t.xy[pin.li * 2 + 1]]), gl.STATIC_DRAW);
gl.vertexAttribPointer(A.xy, 2, gl.SHORT, true, 0, 0);
const hot = getComputedStyle(document.body).getPropertyValue("--hot").trim();
const m = hot.match(/\w\w/g).map((h) => parseInt(h, 16));
gl.disableVertexAttribArray(A.col); gl.disableVertexAttribArray(A.deg);
gl.disableVertexAttribArray(A.alpha);
gl.vertexAttrib3f(A.col, m[0] / 255, m[1] / 255, m[2] / 255);
gl.vertexAttrib1f(A.deg, 1); gl.vertexAttrib1f(A.alpha, 1);
gl.uniform1f(U.pt, 16 * dpr); gl.uniform1f(U.alpha, 1);
gl.drawArrays(gl.POINTS, 0, 1);
gl.enableVertexAttribArray(A.col); gl.enableVertexAttribArray(A.deg);
gl.enableVertexAttribArray(A.alpha);
}
// ── recolor + legend ────────────────────────────────────────────────────────────────────────
function recolor(idx) {
active = idx; filterVal = -1;
for (const t of ready.values()) { colorTile(t); alphaTile(t); }
drawLegend(idx); dirty = true;
}
function buildColorBy() {
const seg = $("colorby");
META.labelSets.forEach((ls, i) => {
const b = document.createElement("button"); b.textContent = ls.name;
b.setAttribute("aria-pressed", i === defaultSet ? "true" : "false");
b.onclick = () => { [...seg.children].forEach((c) => c.setAttribute("aria-pressed", "false"));
b.setAttribute("aria-pressed", "true"); recolor(i); };
seg.appendChild(b);
});
}
function degLabel(b) { return Math.round(Math.pow(10, (b / 255) * (META.degLogMax || 4))); }
function drawLegend(idx) {
const ls = META.labelSets[idx], el = $("legend");
el.innerHTML = "";
const head = document.createElement("span"); head.className = "lbl";
head.textContent = ls.name + (ls.note ? " · " + ls.note : "");
el.appendChild(head);
let entries;
if (ls.kind === "degree") {
const w = 256 / DEG_BUCKETS, c = META.degCounts || []; entries = [];
for (let k = 0; k < DEG_BUCKETS; k++) {
const lo = degLabel(Math.round(k * w)), hi = degLabel(Math.round(Math.min(255, (k + 1) * w)));
entries.push({ val: k, color: rampColor((k + 0.5) * w / 255),
text: fmtN(lo) + "–" + fmtN(hi), count: c[k] || 0 });
}
} else {
const c = ls.counts || ls.classes.map(() => 0), rank = colorRank[idx];
entries = ls.classes.map((cl, k) => ({ val: k, color: CAT[rank[k] % CAT.length], text: cl,
count: c[k] || 0 })).filter((e) => e.count > 0).sort((a, b) => b.count - a.count);
const na = N - c.reduce((s, v) => s + (v || 0), 0); // unlabelled = 255 sentinel
if (na > 0) entries.push({ val: 255, color: UNLAB, text: "N/A", count: na });
}
const wrap = document.createElement("div"); wrap.className = "swatches";
entries.forEach((e) => {
const b = document.createElement("button"); b.type = "button"; b.className = "sw";
b.setAttribute("aria-pressed", filterVal === e.val ? "true" : "false");
b.title = "Show only these — click again to clear";
const c = e.color;
const sw = document.createElement("i");
sw.style.background = `rgb(${c[0] | 0},${c[1] | 0},${c[2] | 0})`;
const nm = document.createElement("span"); nm.className = "nm"; nm.textContent = e.text;
const ct = document.createElement("span"); ct.className = "ct"; ct.textContent = fmtN(e.count);
b.append(sw, nm, ct);
b.onclick = () => {
filterVal = (filterVal === e.val) ? -1 : e.val;
for (const t of ready.values()) alphaTile(t);
drawLegend(idx); dirty = true;
};
wrap.appendChild(b);
});
el.appendChild(wrap); el.classList.add("on");
}
// ── region select: exact count over ALL degree bands ─────────────────────────────────────────
// A tile's bbox IS its quadtree cell and the tiler assigns points by cell, so a tile sitting
// inside the rect contributes its whole ``n`` with zero bytes fetched; only tiles straddling an
// edge are read. That is what makes an exact count over 52.9 M points affordable — a whole-map
// rect costs 0 fetches, a 10 % box ~8 MB.
//
// The EPS slack is not cosmetic. _quantize_xy stores round(unit * 32767), but cell membership was
// decided on the pre-rounding ``unit``, so a point can land up to one quantum (6.1e-5) outside its
// own cell — measured worst case 1.4e-5, concentrated at deep quadtree depths where cells are
// narrower than the quantum. Inflating every bbox by EPS before classifying makes the count exact
// again; clamping the inflated box back to the map keeps the whole-map case free instead of
// turning the border into 123 straddlers.
const clamp1 = (v) => Math.max(-1, Math.min(1, v));
function classify(r) { // r is in world coords, NOT clamped to the map
const full = [], part = []; let freeN = 0;
for (const t of META.tiles) {
const b = t.bbox;
const x0 = clamp1(b[0] - EPS), y0 = clamp1(b[1] - EPS);
const x1 = clamp1(b[2] + EPS), y1 = clamp1(b[3] + EPS);
if (x0 > r.x1 || x1 < r.x0 || y0 > r.y1 || y1 < r.y0) continue; // disjoint
if (x0 >= r.x0 && x1 <= r.x1 && y0 >= r.y0 && y1 <= r.y1) { full.push(t); freeN += t.n; }
else part.push(t);
}
return { full, part, freeN };
}
// Bounds are inclusive throughout: _quantize_xy clips outliers to exactly ±1.0, so points really
// do sit on the outermost edges and a strict test would silently drop them.
function quantRect(r) { return [r.x0 * Q, r.y0 * Q, r.x1 * Q, r.y1 * Q]; }
function hits(xy, K, q, out) {
const ax = q[0], ay = q[1], bx = q[2], by = q[3]; let c = 0;
for (let i = 0; i < K; i++) {
const x = xy[i * 2], y = xy[i * 2 + 1];
if (x >= ax && x <= bx && y >= ay && y <= by) { if (out) out[c] = i; c++; }
}
return c;
}
// ── scan tile cache (deliberately not the render path) ───────────────────────────────────────
function tdirOf(t) { return BASE + "/t/" + (t.d != null ? t.d + "/" : "") + t.id; }
function lru(cache, max, cur) {
for (const [k, v] of cache) { if (cur <= max) break; cache.delete(k); cur -= v.bytes; }
return cur;
}
function scanTile(t, sig) {
const hit = scanCache.get(t.id);
if (hit) { scanCache.delete(t.id); scanCache.set(t.id, hit); return Promise.resolve(hit); }
if (scanWait.has(t.id)) return scanWait.get(t.id);
const p = fetch(tdirOf(t) + ".bin", { signal: sig }).then((r) => {
if (!r.ok) throw new Error(t.id + " " + r.status);
return r.arrayBuffer();
}).then((buf) => {
const K = t.n; let o = 0; // same layout as doLoad(), minus the GL upload
const v = { n: K, xy: new Int16Array(buf, o, K * 2), labs: [], deg: null,
bytes: buf.byteLength };
o += K * 4;
for (let c = 0; c < nCat; c++) { v.labs.push(new Uint8Array(buf, o, K)); o += K; }
v.deg = new Uint8Array(buf, o, K);
scanCache.set(t.id, v); scanBytes = lru(scanCache, SCAN_BYTES_MAX, scanBytes + v.bytes);
return v;
}).finally(() => scanWait.delete(t.id));
scanWait.set(t.id, p); return p;
}
function scanNames(t, sig) {
const hit = nameCache.get(t.id);
if (hit) { nameCache.delete(t.id); nameCache.set(t.id, hit); return Promise.resolve(hit); }
if (nameWait.has(t.id)) return nameWait.get(t.id);
const p = fetch(tdirOf(t) + ".nm", { signal: sig }).then((r) => {
if (!r.ok) throw new Error(t.id + " " + r.status);
return r.text();
}).then((txt) => {
const v = { names: txt.length ? txt.split("\n") : [], bytes: txt.length };
nameCache.set(t.id, v); nameBytes = lru(nameCache, NAME_BYTES_MAX, nameBytes + v.bytes);
return v;
}).finally(() => nameWait.delete(t.id));
nameWait.set(t.id, p); return p;
}
function pool(items, k, fn) { // bounded-concurrency map
let i = 0;
const run = async () => { while (i < items.length) { const j = i++; await fn(items[j]); } };
return Promise.all(Array.from({ length: Math.min(k, items.length) || 1 }, run));
}
// ── commit a selection and scan the straddling tiles ─────────────────────────────────────────
function cancelScan() {
sel.epoch++;
if (scanSig) { scanSig.abort(); scanSig = null; }
}
function setSelection(r) {
cancelScan(); listReset();
Object.assign(sel, { rect: r, cls: null, count: 0, done: 0, todo: 0, errs: 0,
exact: false, partN: new Map() });
if (!r) {
$("selpill").classList.remove("on"); closeSheet(); syncSelBox(); dirty = true; return;
}
const ep = sel.epoch, ac = new AbortController(); scanSig = ac;
const cls = sel.cls = classify(r);
sel.count = cls.freeN; sel.todo = cls.part.length; sel.exact = !cls.part.length;
$("selpill").classList.add("on"); paintBadge(); syncSelBox(); dirty = true;
if (!cls.part.length) return;
const q = quantRect(r);
cls.part.sort((a, b) => a.z - b.z); // band order, so the list can start on band 0 early
pool(cls.part, SCAN_FETCH, async (t) => {
if (ep !== sel.epoch) return;
let v;
try { v = await scanTile(t, ac.signal); } catch { if (ep === sel.epoch) sel.errs++; return; }
if (ep !== sel.epoch) return;
const c = hits(v.xy, t.n, q, null);
sel.partN.set(t.id, c); sel.count += c; sel.done++; paintBadge();
}).then(() => {
if (ep !== sel.epoch) return;
sel.exact = !sel.errs; paintBadge();
});
}
let badgeRaf = 0;
function paintBadge() {
if (badgeRaf) return;
badgeRaf = requestAnimationFrame(() => {
badgeRaf = 0; const b = $("seln"), scanning = !sel.exact && sel.done < sel.todo;
b.textContent = fmtFull(sel.count) + (sel.exact ? " selected" : "+ scanning…");
b.title = sel.exact
? "Hosts inside the rectangle, across all degree bands — not just the points drawn at this "
+ "zoom. Click to list them, highest degree first."
: "reading " + sel.done + " / " + sel.todo + " edge tiles"
+ (sel.errs ? " · " + sel.errs + " failed" : "");
b.style.setProperty("--p", sel.todo ? sel.done / sel.todo : 1);
b.classList.toggle("scanning", scanning);
b.setAttribute("aria-live", sel.exact ? "polite" : "off");
if (sheetOpen) { listSub(); listFoot(); }
});
}
function fmtFull(v) { return v.toLocaleString("en-US"); }
// ── rubber band (a DOM overlay: the shader is a point program with no line primitive, and a
// band updated at pointer rate through GL would force a full redraw of up to 600 tiles) ───────
function syncSelBox() {
const el = $("selbox");
let x0, y0, x1, y1, set = false;
if (band) {
x0 = Math.min(band.x0, band.x1); x1 = Math.max(band.x0, band.x1);
y0 = Math.min(band.y0, band.y1); y1 = Math.max(band.y0, band.y1);
} else if (sel.rect) {
const r = sel.rect, C = 4000; // a rect held while zooming 1000x is megapixels wide
x0 = Math.max(-C, toScreenX(r.x0)); x1 = Math.min(C, toScreenX(r.x1));
y0 = Math.max(-C, toScreenY(r.y1)); y1 = Math.min(C, toScreenY(r.y0)); // screen y flips
set = true;
if (x1 <= x0 || y1 <= y0) { el.classList.remove("on"); return; }
} else { el.classList.remove("on"); return; }
el.style.left = x0 + "px"; el.style.top = y0 + "px";
el.style.width = (x1 - x0) + "px"; el.style.height = (y1 - y0) + "px";
el.classList.toggle("set", set); el.classList.add("on");
}
// ── selected-host list: "next page" IS "next by degree" ──────────────────────────────────────
// ``z`` is a global degree-rank band (band 0 = the top 16 384 hosts by degree, band 1 the next
// 65 536, …), assigned in embed_2d_tile._degree_levels by searchsorted over the degree rank. So
// ascending bands == descending degree, exactly, and a 256-bucket counting sort on deg8 refines
// it within a band. The list is therefore lazy in its own sort key: page 1 of a whole-map
// selection costs one 128 KB tile, and band z+1 is never touched until band z runs out.
function listReset() {
Object.assign(list, { band: 0, buf: null, tiles: [], pos: 0, rows: 0,
eof: false, busy: false, approx: false });
const rows = $("selrows");
rows.textContent = ""; rows.scrollTop = 0;
listSub(); listFoot();
}
let scratch = new Uint32Array(0);
async function nextBand(ep) {
while (list.band <= META.zMax) {
const z = list.band++;
const ts = [];
for (const t of sel.cls.full) if (t.z === z) ts.push(t);
for (const t of sel.cls.part) if (t.z === z) ts.push(t);
if (!ts.length) continue;
let want = 0;
for (const t of ts) want += sel.partN.has(t.id) ? sel.partN.get(t.id) : t.n;
if (!want) continue;
const cap = Math.min(want, BAND_MAX);
const li = new Uint16Array(cap), ti = new Uint16Array(cap), dg = new Uint8Array(cap);
const lb = new Uint8Array(cap * nCat); // labels are COPIED so a row survives tile eviction
const slot = []; let m = 0;
await pool(ts, SCAN_FETCH, async (t) => {
if (ep !== sel.epoch || m >= cap) return;
let v;
try { v = await scanTile(t, scanSig && scanSig.signal); } catch { return; }
if (ep !== sel.epoch) return;
// everything below is synchronous, so one shared scratch is safe across the pool
if (scratch.length < t.n) scratch = new Uint32Array(t.n);
const c = hits(v.xy, t.n, quantRect(sel.rect), scratch);
if (!c) return;
const s = slot.push(t) - 1;
for (let i = 0; i < c && m < cap; i++, m++) {
const j = scratch[i];
ti[m] = s; li[m] = j; dg[m] = v.deg[j];
for (let k = 0; k < nCat; k++) lb[m * nCat + k] = v.labs[k][j];
}
});
if (ep !== sel.epoch) return false;
if (m >= cap && want > cap) list.approx = true;
// counting sort on deg8, descending: O(m), 256 buckets, no comparator
const cnt = new Uint32Array(256);
for (let i = 0; i < m; i++) cnt[dg[i]]++;
const at = new Uint32Array(256); let acc = 0;
for (let v = 255; v >= 0; v--) { at[v] = acc; acc += cnt[v]; }
const ord = new Uint32Array(m);
for (let i = 0; i < m; i++) ord[at[dg[i]]++] = i;
list.buf = { li, ti, dg, lb, ord, m }; list.tiles = slot; list.pos = 0;
if (m) return true;
}
list.eof = true; return false;
}
// Hostnames come from the crawl and are attacker-influenceable; this table renders up to LIST_MAX
// of them, so every cell is filled with textContent, which cannot introduce markup.
function rowEl(t, j, deg8, lb, i) {
const el = document.createElement("div");
el.className = "selrow"; el.tabIndex = 0; el.title = "Show on the map";
const host = document.createElement("span"); host.className = "h"; host.textContent = "…";
const deg = document.createElement("span"); deg.className = "d";
deg.textContent = "~" + fmtN(degLabel(deg8));
el.append(host, deg);
// One adaptive label column rather than one per set: across the full corpus language is 68 %
// populated but topic is 0.3 % and quality 1.3 %, so per-set columns would be em-dashes almost
// every row. Joining whatever *is* known keeps the information and drops the dead space.
const known = [], full = [];
let k2 = 0;
META.labelSets.forEach((ls) => {
if (ls.kind === "degree") return; // labs is indexed by CAT position, not absolute
const v = lb[i * nCat + k2++];
if (v === 255) return;
known.push(ls.classes[v]);
full.push(ls.name + ": " + ls.classes[v]);
});
const sp = document.createElement("span"); sp.className = "c";
sp.textContent = known.length ? known.join(" · ") : "—";
// the cell is narrow, so which set a value came from lives in the tooltip
sp.title = full.join(" · ") || "no labels";
el.appendChild(sp);
const go = () => flyTo([host.textContent, t.id, j, deg8]);
el.onclick = go;
el.onkeydown = (ev) => {
if (ev.key === "Enter" || ev.key === " ") { ev.preventDefault(); go(); }
};
return { el, host };
}
async function listFill() {
if (list.busy || list.eof || list.rows >= LIST_MAX || !sel.rect) return;
list.busy = true; const ep = sel.epoch;
try {
while (!list.buf || list.pos >= list.buf.m) {
list.buf = null;
const more = await nextBand(ep);
if (ep !== sel.epoch) return;
if (!more) { listEmpty(); listFoot(); return; }
}
const b = list.buf, take = Math.min(PAGE, b.m - list.pos, LIST_MAX - list.rows);
const frag = document.createDocumentFragment(), need = new Map();
for (let k = 0; k < take; k++) {
const i = b.ord[list.pos + k], t = list.tiles[b.ti[i]], j = b.li[i];
const r = rowEl(t, j, b.dg[i], b.lb, i);
if (!need.has(t)) need.set(t, []);
need.get(t).push([r.host, j]);
frag.appendChild(r.el);
}
list.pos += take; list.rows += take;
$("selrows").appendChild(frag); listFoot();
// .nm is ~2x the bytes of .bin, so names are fetched only for the tiles this page shows —
// the same lazy-name discipline doLoad() uses once a tile is already drawable.
pool([...need.keys()], 4, async (t) => {
let v;
try { v = await scanNames(t, scanSig && scanSig.signal); } catch { v = null; }
if (ep !== sel.epoch) return;
for (const pair of need.get(t)) {
pair[0].textContent = (v && v.names[pair[1]]) || "(unnamed)";
}
});
// a short page may not overflow the scroller, so ``scroll`` would never fire again
const e = $("selrows");
if (e.scrollHeight <= e.clientHeight && !list.eof && list.rows < LIST_MAX) {
requestAnimationFrame(listFill);
}
} finally { list.busy = false; }
}
function listEmpty() {
if (list.rows) return;
const d = document.createElement("div"); d.className = "empty";
d.textContent = sel.count
? "Nothing to list — the tiles for this region could not be read."
: "No hosts in this region.";
$("selrows").appendChild(d);
}
function buildSelHead() {
const hd = $("selhd"); hd.textContent = "";
const cats = META.labelSets.filter((ls) => ls.kind !== "degree").map((ls) => ls.name);
["host", "degree", "labels"].forEach((c, k) => {
const s = document.createElement("span"); s.textContent = c;
if (k === 2) s.title = cats.join(", ") + " — whichever are known for that host";
hd.appendChild(s);
});
}
function listSub() {
if (!sel.rect) { $("selsub").textContent = ""; return; }
$("selsub").textContent =
"Every host in the rectangle, across all degree bands — not just the points drawn at this "
+ "zoom. Highest degree first. Click a row to fly to it.";
}
function note(cls, text) {
const s = document.createElement("span"); s.className = cls; s.textContent = text; return s;
}
function listFoot() {
const f = $("selfoot"); f.textContent = "";
f.appendChild(note("", fmtFull(list.rows) + " of " + fmtFull(sel.count)
+ (sel.exact ? "" : "+") + " shown"));
if (list.rows >= LIST_MAX) {
f.appendChild(note("warn", "capped at " + fmtFull(LIST_MAX)
+ " rows — shrink the rectangle to reach further down"));
}
if (list.approx) {
f.appendChild(note("warn", "order approximate past " + fmtFull(BAND_MAX)
+ " rows in one band"));
}
if (sel.errs) f.appendChild(note("warn", sel.errs + " tile(s) failed to load"));
const c = document.createElement("button");
c.type = "button"; c.textContent = "clear";
c.onclick = () => setSelection(null);
f.appendChild(c);
}
function openSheet() {
if (!sel.rect) return;
sheetOpen = true;
$("sel").classList.add("on"); $("seln").setAttribute("aria-expanded", "true");
$("selpill").classList.add("open");
document.body.classList.add("sheet");
listSub(); $("selx").focus(); listFill();
}
function closeSheet() {
if (!sheetOpen) return;
sheetOpen = false;
$("sel").classList.remove("on"); $("seln").setAttribute("aria-expanded", "false");
$("selpill").classList.remove("open");
document.body.classList.remove("sheet");
$("seln").focus();
}
// ── hover pick (linear scan over visible tiles) ─────────────────────────────────────────────
const PICK_PX = 15;
function pick(px, py) {
const w = cv.clientWidth, h = cv.clientHeight;
const p = toWorld(px, py), sx = p.x * Q, sy = p.y * Q;
const supx = (2 / w) / (view.s * asp) * Q, supy = (2 / h) / view.s * Q;
let best = null, bd = PICK_PX * PICK_PX;
for (const id of activeIds) {
const t = ready.get(id); if (!t || t.status !== "ready") continue;
const xy = t.xy;
for (let i = 0; i < t.n; i++) {
const dxp = (xy[i * 2] - sx) / supx, dyp = (xy[i * 2 + 1] - sy) / supy;
const d = dxp * dxp + dyp * dyp;
if (d < bd) { bd = d; best = { id, li: i, t }; }
}
}
return best;
}
function hover(px, py) {
const hit = pick(px, py); const tip = $("tip");
if (!hit) { tip.style.display = "none"; return; }
const t = hit.t, i = hit.li;
const name = t.names ? (t.names[i] || null) : null;
// Hostnames are crawl-derived, so they go in as text, never as markup.
tip.textContent = "";
const h = document.createElement("div"); h.className = "host";
h.textContent = name || "(loading name…)";
tip.appendChild(h);
tip.appendChild(tipRow("degree", "~" + fmtN(degLabel(t.deg[i]))));
META.labelSets.forEach((ls, k) => {
if (ls.kind === "degree") return;
const v = t.labs[k][i];
tip.appendChild(tipRow(ls.name, v === 255 ? "—" : ls.classes[v]));
});
tip.style.left = px + "px"; tip.style.top = py + "px"; tip.style.display = "block";
}
function tipRow(label, value) {
const row = document.createElement("span"); row.className = "row";
const b = document.createElement("b"); b.textContent = label;
const v = document.createElement("span"); v.textContent = value;
row.append(b, v); return row;
}
// ── search (global top-degree index from manifest) ──────────────────────────────────────────
function buildSearch() {
const idxList = META.search || [];
const lo = idxList.map((e) => e[0].toLowerCase());
const q = $("q"), hits = $("hits");
q.addEventListener("input", () => {
const term = q.value.trim().toLowerCase(); hits.innerHTML = "";
if (!term) return;
const out = [];
for (let k = 0; k < idxList.length && out.length < 30; k++)
if (lo[k].includes(term)) out.push(idxList[k]);
out.forEach((e) => {
const li = document.createElement("li"); li.setAttribute("role", "option");
const nm = document.createElement("span"); nm.textContent = e[0];
const dg = document.createElement("span"); dg.className = "deg";
dg.textContent = "~" + fmtN(degLabel(e[3]));
li.append(nm, dg);
li.onclick = () => flyTo(e); hits.appendChild(li);
});
});
}
function flyTo(entry) { // entry = [name, tileId, localIdx, deg8]
const [, tid, liLocal] = entry; const meta = tileMeta.get(tid); if (!meta) return;
startLoad(tid);
const b = meta.bbox, tx = (b[0] + b[2]) / 2, ty = (b[1] + b[3]) / 2; // fallback: tile centre
const finish = () => {
const t = ready.get(tid);
const px = (t && t.xy) ? t.xy[liLocal * 2] / Q : tx;
const py = (t && t.xy) ? t.xy[liLocal * 2 + 1] / Q : ty;
pin = { id: tid, li: liLocal };
const s0 = view.s, cx0 = view.cx, cy0 = view.cy, ts = Math.max(40, view.s), t0 = performance.now(), D = 620;
const reduce = matchMedia("(prefers-reduced-motion: reduce)").matches;
(function step(now) {
const p = reduce ? 1 : Math.min(1, (now - t0) / D), e = 1 - Math.pow(1 - p, 3);
view.s = s0 + (ts - s0) * e; view.cx = cx0 + (px - cx0) * e; view.cy = cy0 + (py - cy0) * e;
dirty = true; if (p < 1) requestAnimationFrame(step);
})(t0);
};
const t = ready.get(tid);
if (t && t.status === "ready") finish();
else { const iv = setInterval(() => { const tt = ready.get(tid);
if (tt && tt.status === "ready") { clearInterval(iv); finish(); } }, 60); }
}
// ── interaction ─────────────────────────────────────────────────────────────────────────────
let drag = null;
// Shift (or the armed ``select`` toggle) at pointerdown latches rect-select for the WHOLE gesture:
// releasing Shift mid-drag must not turn a rubber band into a pan, or vice versa.
cv.addEventListener("pointerdown", (e) => {
cv.setPointerCapture(e.pointerId);
if (e.shiftKey || selArmed) {
band = { x0: e.clientX, y0: e.clientY, x1: e.clientX, y1: e.clientY };
$("tip").style.display = "none"; syncSelBox(); return;
}
drag = { x: e.clientX, y: e.clientY };
});
function endBand(commit) {
if (!band) return;
const b = band; band = null;
if (!commit || Math.abs(b.x1 - b.x0) < 4 || Math.abs(b.y1 - b.y0) < 4) {
setSelection(null); return; // a shift-*click* clears the selection
}
// The rect is NOT clamped to the map: only the tile bboxes are (in classify). That way a drag
// past every edge still counts everything for free, while a drag entirely off the map stays a
// real, empty rectangle instead of collapsing onto the border.
const p = toWorld(b.x0, b.y0), q = toWorld(b.x1, b.y1);
setSelection({ x0: Math.min(p.x, q.x), y0: Math.min(p.y, q.y),
x1: Math.max(p.x, q.x), y1: Math.max(p.y, q.y) });
}
cv.addEventListener("pointerup", () => { endBand(true); drag = null; });
cv.addEventListener("pointercancel", () => { endBand(false); drag = null; });
cv.addEventListener("pointermove", (e) => {
if (band) { band.x1 = e.clientX; band.y1 = e.clientY; syncSelBox(); return; }
if (drag) {
const w = cv.clientWidth, h = cv.clientHeight;
view.cx -= ((e.clientX - drag.x) / w) * 2 / (view.s * asp);
view.cy += ((e.clientY - drag.y) / h) * 2 / view.s;
drag.x = e.clientX; drag.y = e.clientY; dirty = true; $("tip").style.display = "none";
} else { hover(e.clientX, e.clientY); }
});
cv.addEventListener("pointerleave", () => { $("tip").style.display = "none"; });
// ── colour-property help ────────────────────────────────────────────────────────────────────
// One short paragraph per colourable property, keyed by label-set name so the dialog lists only
// the sets this build actually shipped. Rendered once, on first open.
const HELP = {
topic: ["What the sites are about, in 24 categories from the WebOrganizer corpus. Labels are " +
"assigned per page and rolled up to the host, so only a small share of hosts carry one \u2014 " +
"but topic is the property these embeddings separate best.",
[["https://huggingface.co/datasets/WebOrganizer/Corpus-200B", "WebOrganizer/Corpus-200B"]]],
language: ["The main content language of a host's pages, across 120 languages. Detected per " +
"page with CLD2 and read from Common Crawl's columnar URL index. This has the widest " +
"coverage of the four. Sites tend to link to sites in the same language, so it separates " +
"cleanly once a host has enough links.",
[["https://github.com/commoncrawl/language-detection-cld2", "Language detection (CLD2)"],
["https://commoncrawl.org/blog/index-to-warc-files-and-urls-in-columnar-format",
"Columnar URL index"]]],
quality: ["A four-way content-quality annotation from GneissWeb. Its source crawls predate this " +
"graph, so coverage is thin and tilted toward long-lived sites.",
[["https://huggingface.co/datasets/commoncrawl/gneissweb-annotation-host-testing-v1",
"gneissweb-annotation-host-testing-v1"]]],
degree: ["How many links a host has in the web graph, counting both directions. The only one of " +
"the four that is not a label \u2014 it is read straight off the graph, so every host has a " +
"value. High-degree hubs pull toward the dense centre.",
[["https://commoncrawl.org/web-graphs", "Common Crawl web graphs"]]],
};
let helpBuilt = false;
function buildHelp() {
if (helpBuilt) return;
helpBuilt = true;
const seen = new Set(META.labelSets.map((ls) => ls.name));
$("helpbody").innerHTML = Object.keys(HELP).filter((k) => seen.has(k)).map((k) => {
const [text, links] = HELP[k];
const hrefs = links
.map(([href, label]) => `<a href="${href}" target="_blank" rel="noopener">${label}</a>`)
.join(" · ");
return `<h3>${k}</h3><p>${text} ${hrefs}</p>`;
}).join("");
}
function openHelp() {
buildHelp();
$("scrim").hidden = false; $("help").hidden = false;
$("helpx").focus();
}
function closeHelp() {
$("scrim").hidden = true; $("help").hidden = true;
$("helpbtn").focus();
}
$("helpbtn").onclick = () => ($("help").hidden ? openHelp() : closeHelp());
$("helpx").onclick = closeHelp;
$("scrim").onclick = closeHelp;
$("seln").onclick = () => (sheetOpen ? closeSheet() : openSheet());
$("selclr").onclick = () => setSelection(null);
$("selx").onclick = () => closeSheet();
$("selarm").onclick = () => {
selArmed = !selArmed;
$("selarm").setAttribute("aria-pressed", selArmed ? "true" : "false");
cv.style.cursor = selArmed ? "cell" : "crosshair";
};
window.addEventListener("keydown", (e) => {
if (e.key !== "Escape" || e.target === $("q")) return; // let the search box clear itself
if (!$("help").hidden) closeHelp();
else if (sheetOpen) closeSheet(); else if (sel.rect) setSelection(null);
});
$("selrows").addEventListener("scroll", () => {
const e = $("selrows");
if (e.scrollTop + e.clientHeight > e.scrollHeight - 400) listFill();
}, { passive: true });
cv.addEventListener("wheel", (e) => {
e.preventDefault();
const w = cv.clientWidth, h = cv.clientHeight;
const ndcx = (e.clientX / w) * 2 - 1, ndcy = 1 - (e.clientY / h) * 2;
const wx = (ndcx / (view.s * asp)) + view.cx, wy = (ndcy / view.s) + view.cy;
const f = Math.exp(-e.deltaY * 0.0016); view.s = Math.max(0.15, Math.min(1200, view.s * f));
view.cx = wx - (ndcx / (view.s * asp)); view.cy = wy - (ndcy / view.s); dirty = true;
}, { passive: false });
// "reset" means everything the user can leave behind: camera, rubber-band selection, and the
// pinned host a row click or a search hit dropped on the map.
$("reset").onclick = () => {
view = { s: 0.9, cx: 0, cy: 0 }; pin = null; setSelection(null); dirty = true;
};
function resize() {
const w = cv.clientWidth, h = cv.clientHeight;
cv.width = Math.round(w * dpr); cv.height = Math.round(h * dpr);
gl.viewport(0, 0, cv.width, cv.height); asp = h / w; dirty = true;
}
window.addEventListener("resize", resize);
// ── render loop ─────────────────────────────────────────────────────────────────────────────
let fFrames = 0, fT = performance.now(), spinOn = false, spinUntil = 0;
function syncSpinner(now) { // ring visible while any tile is queued/fetching
const busy = inflight > 0 || queue.length > 0; // ...held ≥350ms so fast local loads still flash
if (busy) spinUntil = now + 350;
const show = busy || now < spinUntil;
if (show !== spinOn) { spinOn = show; $("spin").classList.toggle("on", show); }
}
function loop(now) {
syncSpinner(now);
if (dirty) {
updateActive(); draw(); dirty = false;
$("zoom").textContent = view.s.toFixed(view.s < 10 ? 1 : 0) + "×";
}
fFrames++;
if (now - fT > 500) { $("fps").textContent = Math.round((fFrames * 1000) / (now - fT)); fFrames = 0; fT = now; }
requestAnimationFrame(loop);
}
})();
</script>
</body>
</html>
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