[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"playground-navigation-api-intercept-navigation":3,"verticals":19,"search-suggestions":58},{"slug":4,"title":5,"summary":6,"html":7,"css":8,"js":9,"config":10,"doc":13},"navigation-api-intercept-navigation","Navigation race — interactive playground",null,"\u003Cdiv class=\"pg\">\n    \u003Ch1 class=\"pg-title\">🎮 Whoever finishes last, wins?\u003C\u002Fh1>\n    \u003Cp class=\"pg-sub\">\n      Click two links fast. Watch which page actually ends up on screen. This simulates\n      the exact race condition from the post — \u003Ccode>pushState\u003C\u002Fcode> timing on one side,\n      \u003Ccode>event.signal\u003C\u002Fcode> cancellation (the Navigation API's real abort mechanism) on\n      the other — so it reproduces reliably in any browser, not just the ones that ship\n      the real API yet.\n    \u003C\u002Fp>\n\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">1\u003C\u002Fspan> Controls\u003C\u002Fdiv>\n      \u003Cdiv class=\"seg\" id=\"modeSeg\" role=\"group\" aria-label=\"Routing strategy\">\n        \u003Cbutton class=\"seg-btn\" data-mode=\"old\" aria-pressed=\"true\">Old way — pushState + popstate\u003C\u002Fbutton>\n        \u003Cbutton class=\"seg-btn\" data-mode=\"new\" aria-pressed=\"false\">New way — Navigation API intercept()\u003C\u002Fbutton>\n      \u003C\u002Fdiv>\n\n      \u003Cdiv class=\"field\" style=\"margin-top:14px\">\n        \u003Clabel class=\"label\" for=\"speed\">Network speed\u003C\u002Flabel>\n        \u003Cinput type=\"range\" id=\"speed\" min=\"1\" max=\"5\" value=\"3\" \u002F>\n        \u003Cspan class=\"pill\" id=\"speedLabel\">medium\u003C\u002Fspan>\n      \u003C\u002Fdiv>\n\n      \u003Cdiv class=\"btn-row\" style=\"margin-top:14px\">\n        \u003Cbutton class=\"btn primary\" id=\"goHome\">Go to \u002Fhome\u003C\u002Fbutton>\n        \u003Cbutton class=\"btn primary\" id=\"goReports\">Go to \u002Freports\u003C\u002Fbutton>\n        \u003Cbutton class=\"btn ghost\" id=\"reset\">Reset\u003C\u002Fbutton>\n      \u003C\u002Fdiv>\n\n      \u003Cdiv class=\"presets\" style=\"margin-top:14px\">\n        \u003Cbutton class=\"btn sm\" id=\"presetRace\">⚡ Simulate a double-click race\u003C\u002Fbutton>\n      \u003C\u002Fdiv>\n      \u003Cp class=\"hint\">\n        The preset always fires \u003Ccode>\u002Freports\u003C\u002Fcode> first (slow) then \u003Ccode>\u002Fhome\u003C\u002Fcode>\n        right after (fast) — the exact shape of clicking a link, changing your mind, and\n        clicking a second one before the first page loads.\n      \u003C\u002Fp>\n    \u003C\u002Fdiv>\n\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">2\u003C\u002Fspan> Result\u003C\u002Fdiv>\n      \u003Cdiv class=\"browser\">\n        \u003Cdiv class=\"addressbar\">\n          \u003Cspan class=\"dots\">\u003Cspan>\u003C\u002Fspan>\u003Cspan>\u003C\u002Fspan>\u003Cspan>\u003C\u002Fspan>\u003C\u002Fspan>\n          \u003Cspan class=\"url\">yourapp.com\u003Cspan id=\"addr\">\u002F\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003C\u002Fdiv>\n        \u003Cdiv class=\"page\" id=\"page\">—\u003C\u002Fdiv>\n      \u003C\u002Fdiv>\n      \u003Cdiv class=\"status\" id=\"status\" style=\"margin-top:12px\">\n        \u003Cspan class=\"dot info\" id=\"dot\">\u003C\u002Fspan>\u003Cspan id=\"statusText\">Ready — try the preset first.\u003C\u002Fspan>\n      \u003C\u002Fdiv>\n      \u003Cp class=\"hint\" id=\"hint\">\n        Watch the address bar and the page below it. In the old way, they can disagree.\n      \u003C\u002Fp>\n    \u003C\u002Fdiv>\n\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">3\u003C\u002Fspan> What happened (log)\u003C\u002Fdiv>\n      \u003Cdiv class=\"log\" id=\"log\">\u003C\u002Fdiv>\n    \u003C\u002Fdiv>\n  \u003C\u002Fdiv>","\u002F*\n * Shared playground design system — daily-post\n * ============================================\n * Link it from any post's playground\u002Findex.html (no per-post boilerplate):\n *\n *   \u003Clink rel=\"stylesheet\" href=\"..\u002F..\u002F..\u002Fplayground\u002Fassets\u002Fbase.css\" \u002F>\n *\n * The relative path resolves the same locally (posts\u002F\u003Cbase>\u002Fplayground\u002F) and on\n * the deployed host (public\u002Fposts\u002F\u003Cbase>\u002Fplayground\u002F), because build-site.js\n * mirrors this file to public\u002Fplayground\u002Fassets\u002Fbase.css. For a CodeSandbox\n * --embed, playground.js inlines this file so the single-file sandbox still styles.\n *\n * Then write ONLY the demo-specific CSS in your inline \u003Cstyle>. Everything below\n * — tokens, layout, panels, buttons, toggles, sliders, code blocks, status\u002Flog,\n * banners, presets — comes for free and looks consistent across every post.\n *\n * Theme-aware: dark by default, light via prefers-color-scheme AND a\n * [data-theme] override on \u003Chtml> (so a toggle can force either). Accessible:\n * real focus rings, adequate contrast, reduced-motion honored.\n *\u002F\n\n\u002F* ---------- design tokens ---------- *\u002F\n:root {\n  --bg: #0d1117;\n  --bg-grid: #ffffff0a;\n  --panel: #161b22;\n  --panel-2: #0b0e14;\n  --card: #0b0e14;\n  --ink: #e8ebf2;\n  --muted: #9aa4b2;\n  --faint: #6b7688;\n  --line: #232a35;\n  --line-soft: #ffffff12;\n  --accent: #7c9cff;\n  --accent-ink: #0b0e14;\n  --good: #3fb950;\n  --warn: #f0883e;\n  --bad: #f85149;\n  --info: #58a6ff;\n  --radius: 14px;\n  --radius-sm: 9px;\n  --shadow: 0 8px 30px #0006;\n  --shadow-sm: 0 4px 14px #0005;\n  --mono: ui-monospace, SFMono-Regular, \"SF Mono\", Menlo, Consolas, \"Liberation Mono\", monospace;\n  --sans: ui-sans-serif, system-ui, -apple-system, \"Segoe UI\", Roboto, \"Helvetica Neue\", sans-serif;\n  color-scheme: dark;\n}\n\n\u002F* Light theme — system preference, overridable by [data-theme] on \u003Chtml>. *\u002F\n@media (prefers-color-scheme: light) {\n  :root:not([data-theme=\"dark\"]) {\n    --bg: #f4f6fb;\n    --bg-grid: #00000008;\n    --panel: #ffffff;\n    --panel-2: #f0f3f9;\n    --card: #f7f9fc;\n    --ink: #131722;\n    --muted: #5b6472;\n    --faint: #8a93a3;\n    --line: #e2e7f0;\n    --line-soft: #00000010;\n    --accent: #2f6df0;\n    --accent-ink: #ffffff;\n    --good: #1a7f37;\n    --warn: #bc4c00;\n    --bad: #cf222e;\n    --info: #0969da;\n    --shadow: 0 8px 30px #0000001f;\n    --shadow-sm: 0 4px 14px #00000014;\n    color-scheme: light;\n  }\n}\n:root[data-theme=\"light\"] {\n  --bg: #f4f6fb;\n  --bg-grid: #00000008;\n  --panel: #ffffff;\n  --panel-2: #f0f3f9;\n  --card: #f7f9fc;\n  --ink: #131722;\n  --muted: #5b6472;\n  --faint: #8a93a3;\n  --line: #e2e7f0;\n  --line-soft: #00000010;\n  --accent: #2f6df0;\n  --accent-ink: #ffffff;\n  --good: #1a7f37;\n  --warn: #bc4c00;\n  --bad: #cf222e;\n  --info: #0969da;\n  --shadow: 0 8px 30px #0000001f;\n  --shadow-sm: 0 4px 14px #00000014;\n  color-scheme: light;\n}\n\n\u002F* ---------- reset & base ---------- *\u002F\n*, *::before, *::after { box-sizing: border-box; }\n\nbody {\n  margin: 0;\n  min-height: 100vh;\n  font-family: var(--sans);\n  color: var(--ink);\n  background:\n    radial-gradient(circle at 1px 1px, var(--bg-grid) 1px, transparent 0) 0 0 \u002F 24px 24px,\n    var(--bg);\n  display: flex;\n  justify-content: center;\n  align-items: flex-start;\n  padding: clamp(14px, 3vw, 26px);\n  line-height: 1.55;\n  -webkit-font-smoothing: antialiased;\n  text-rendering: optimizeLegibility;\n}\n\n\u002F* The single content column. *\u002F\n.pg {\n  width: 100%;\n  max-width: 860px;\n}\n\n\u002F* ---------- header ---------- *\u002F\n.pg-title {\n  font-size: clamp(1.15rem, 1rem + 1vw, 1.4rem);\n  font-weight: 800;\n  letter-spacing: -0.02em;\n  margin: 0 0 4px;\n  display: flex;\n  align-items: center;\n  gap: 9px;\n}\n.pg-sub {\n  color: var(--muted);\n  font-size: 0.92rem;\n  line-height: 1.5;\n  margin: 0 0 16px;\n  max-width: 66ch;\n}\n.pg-sub strong, .pg-sub b { color: var(--ink); font-weight: 700; }\n.pg-sub code { font-family: var(--mono); background: var(--line-soft); color: var(--accent);\n  padding: 1px 6px; border-radius: 6px; font-size: 0.85em; }\n\n\u002F* ---------- panels ---------- *\u002F\n.panel {\n  background: var(--panel);\n  border: 1px solid var(--line);\n  border-radius: var(--radius);\n  padding: 16px 18px;\n  margin-bottom: 14px;\n  box-shadow: var(--shadow-sm);\n}\n.panel-label {\n  font-size: 0.7rem;\n  text-transform: uppercase;\n  letter-spacing: 0.08em;\n  color: var(--muted);\n  font-weight: 800;\n  margin: 0 0 13px;\n  display: flex;\n  align-items: center;\n  gap: 8px;\n}\n.panel-label .n {\n  display: inline-grid; place-items: center;\n  width: 18px; height: 18px; border-radius: 50%;\n  background: var(--accent); color: var(--accent-ink);\n  font-size: 0.66rem; font-weight: 800;\n}\n\n\u002F* ---------- layout helpers ---------- *\u002F\n.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }\n.row.between { justify-content: space-between; }\n.col { display: flex; flex-direction: column; gap: 10px; }\n.grow { flex: 1 1 0; min-width: 0; }\n.wrap-controls { display: flex; flex-wrap: wrap; gap: 16px 24px; align-items: flex-end; }\n.field { display: flex; flex-direction: column; gap: 7px; min-width: 0; }\n.field > .label, .ctl-label {\n  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.04em;\n  color: var(--muted); font-weight: 800;\n}\n\n\u002F* ---------- buttons ---------- *\u002F\n.btn {\n  font: inherit; font-weight: 650; font-size: 0.88rem;\n  cursor: pointer; user-select: none;\n  border: 1px solid var(--line);\n  background: var(--card); color: var(--ink);\n  padding: 9px 15px; border-radius: var(--radius-sm);\n  display: inline-flex; align-items: center; gap: 8px;\n  transition: background .15s ease, border-color .15s ease, transform .05s ease, color .15s ease;\n}\n.btn:hover { background: var(--line-soft); border-color: var(--muted); }\n.btn:active { transform: translateY(1px); }\n.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }\n.btn[disabled] { opacity: 0.45; cursor: not-allowed; }\n.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }\n.btn.primary:hover { filter: brightness(1.08); background: var(--accent); }\n.btn.good { background: var(--good); border-color: var(--good); color: #04140a; }\n.btn.bad  { background: var(--bad);  border-color: var(--bad);  color: #fff; }\n.btn.ghost { background: transparent; }\n.btn.sm { padding: 6px 11px; font-size: 0.82rem; }\n\n.btn-row { display: flex; flex-wrap: wrap; gap: 9px; }\n\n\u002F* Segmented control — a row of buttons where one is active (aria-pressed). *\u002F\n.seg { display: inline-flex; background: var(--card); border: 1px solid var(--line);\n  border-radius: var(--radius-sm); padding: 3px; gap: 3px; }\n.seg button {\n  font: inherit; font-weight: 650; font-size: 0.84rem; cursor: pointer;\n  border: none; background: transparent; color: var(--muted);\n  padding: 7px 13px; border-radius: 7px;\n  transition: background .15s ease, color .15s ease;\n}\n.seg button:hover { color: var(--ink); }\n.seg button[aria-pressed=\"true\"] { background: var(--accent); color: var(--accent-ink); }\n.seg button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }\n\n\u002F* Preset chips — worked-example shortcuts. *\u002F\n.presets { display: flex; flex-wrap: wrap; gap: 8px; }\n.presets .btn { background: var(--panel-2); }\n\n\u002F* ---------- toggle switch ---------- *\u002F\n.toggle { display: inline-flex; align-items: center; gap: 10px; cursor: pointer;\n  font-size: 0.88rem; font-weight: 600; user-select: none; }\n.toggle input { position: absolute; opacity: 0; width: 0; height: 0; }\n.switch { position: relative; width: 44px; height: 25px; border-radius: 999px; flex: none;\n  background: var(--line); border: 1px solid var(--line); transition: background .18s ease; }\n.switch::after { content: \"\"; position: absolute; top: 2px; left: 2px; width: 19px; height: 19px;\n  border-radius: 50%; background: #cfd6e4; transition: transform .18s ease; box-shadow: 0 1px 3px #0006; }\n.toggle input:checked + .switch { background: var(--good); border-color: var(--good); }\n.toggle input:checked + .switch::after { transform: translateX(19px); background: #fff; }\n.toggle input:focus-visible + .switch { outline: 2px solid var(--accent); outline-offset: 2px; }\n\n\u002F* ---------- range slider ---------- *\u002F\ninput[type=\"range\"] {\n  -webkit-appearance: none; appearance: none; width: 100%; height: 6px;\n  background: var(--line); border-radius: 999px; outline: none; cursor: pointer; margin: 8px 0;\n}\ninput[type=\"range\"]::-webkit-slider-thumb {\n  -webkit-appearance: none; appearance: none; width: 19px; height: 19px; border-radius: 50%;\n  background: var(--accent); border: 2px solid var(--panel); box-shadow: var(--shadow-sm); cursor: pointer;\n}\ninput[type=\"range\"]::-moz-range-thumb {\n  width: 19px; height: 19px; border-radius: 50%; background: var(--accent);\n  border: 2px solid var(--panel); box-shadow: var(--shadow-sm); cursor: pointer;\n}\ninput[type=\"range\"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }\n\n\u002F* ---------- text inputs \u002F selects ---------- *\u002F\ninput[type=\"text\"], input[type=\"number\"], input[type=\"search\"], select, textarea {\n  font: inherit; color: var(--ink); background: var(--card);\n  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 8px 11px; width: 100%;\n}\ntextarea { font-family: var(--mono); font-size: 0.85rem; line-height: 1.6; resize: vertical; }\ninput:focus-visible, select:focus-visible, textarea:focus-visible {\n  outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent);\n}\n\n\u002F* ---------- status \u002F output \u002F log ---------- *\u002F\n.status {\n  display: flex; align-items: center; gap: 9px; flex-wrap: wrap;\n  font-size: 0.9rem; font-weight: 600;\n  padding: 11px 14px; border-radius: var(--radius-sm);\n  background: var(--panel-2); border: 1px solid var(--line); color: var(--ink);\n}\n.status.good { border-color: color-mix(in srgb, var(--good) 55%, var(--line)); }\n.status.warn { border-color: color-mix(in srgb, var(--warn) 55%, var(--line)); }\n.status.bad  { border-color: color-mix(in srgb, var(--bad) 55%, var(--line)); }\n.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); flex: none; }\n.dot.good { background: var(--good); } .dot.warn { background: var(--warn); }\n.dot.bad { background: var(--bad); } .dot.info { background: var(--info); }\n\n.output { background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius-sm);\n  padding: 13px 15px; }\n.log { font-family: var(--mono); font-size: 0.8rem; line-height: 1.7; background: var(--card);\n  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 11px 14px;\n  max-height: 220px; overflow-y: auto; white-space: pre-wrap; }\n\n\u002F* ---------- code block + syntax tokens ---------- *\u002F\n.code {\n  font-family: var(--mono); font-size: 0.82rem; line-height: 1.7;\n  background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius-sm);\n  padding: 13px 15px; overflow-x: auto; white-space: pre; tab-size: 2;\n}\n.code .tok-sel  { color: var(--accent); }\n.code .tok-prop { color: #86e29b; }\n.code .tok-kw   { color: #ff9bcb; }\n.code .tok-str  { color: #f0c674; }\n.code .tok-num  { color: #f0883e; }\n.code .tok-cmt  { color: var(--faint); font-style: italic; }\n.code .hl { background: color-mix(in srgb, var(--good) 22%, transparent); border-radius: 4px; padding: 0 3px; }\n\n\u002F* ---------- hint \u002F caption ---------- *\u002F\n.hint { font-size: 0.83rem; color: var(--muted); line-height: 1.55; margin: 10px 0 0; }\n.hint code { font-family: var(--mono); color: var(--ink); background: var(--line-soft);\n  padding: 1px 5px; border-radius: 5px; font-size: 0.86em; }\n.hint strong { color: var(--ink); }\n\n\u002F* ---------- banner (feature-support \u002F notices) ---------- *\u002F\n.banner {\n  display: none; margin-bottom: 14px; padding: 11px 14px; border-radius: 11px;\n  font-size: 0.85rem; line-height: 1.5;\n  color: var(--ink); background: color-mix(in srgb, var(--warn) 12%, var(--panel));\n  border: 1px solid color-mix(in srgb, var(--warn) 45%, var(--line));\n}\n.banner.show { display: block; }\n.banner.info { background: color-mix(in srgb, var(--info) 12%, var(--panel));\n  border-color: color-mix(in srgb, var(--info) 45%, var(--line)); }\n.banner code { font-family: var(--mono); background: var(--line-soft); padding: 1px 5px; border-radius: 5px; }\n\n\u002F* ---------- misc atoms ---------- *\u002F\n.pill { display: inline-flex; align-items: center; gap: 6px; font-size: 0.75rem; font-weight: 700;\n  padding: 3px 9px; border-radius: 999px; background: var(--line-soft); color: var(--muted); }\n.pill.good { color: var(--good); background: color-mix(in srgb, var(--good) 16%, transparent); }\n.pill.bad  { color: var(--bad);  background: color-mix(in srgb, var(--bad) 16%, transparent); }\n.mono { font-family: var(--mono); }\n.muted { color: var(--muted); }\n.big-num { font-family: var(--mono); font-size: 1.6rem; font-weight: 800; letter-spacing: -0.02em; }\n\n\u002F* Optional theme toggle button (top-right). Wire it in JS if you want it. *\u002F\n.theme-btn { position: fixed; top: 12px; right: 12px; z-index: 20; }\n\n\u002F* ---------- responsive ---------- *\u002F\n@media (max-width: 560px) {\n  .panel { padding: 14px; }\n  .wrap-controls { gap: 14px; }\n  .btn { padding: 9px 13px; }\n}\n\n\u002F* ---------- reduced motion ---------- *\u002F\n@media (prefers-reduced-motion: reduce) {\n  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }\n}\n\n\n.browser {\n    border: 1px solid var(--line);\n    border-radius: var(--radius-sm);\n    overflow: hidden;\n    background: var(--panel-2);\n  }\n  .addressbar {\n    display: flex;\n    align-items: center;\n    gap: 8px;\n    padding: 8px 12px;\n    background: var(--panel);\n    border-bottom: 1px solid var(--line);\n    font-family: var(--mono, monospace);\n    font-size: 0.85rem;\n  }\n  .addressbar .dots { display: flex; gap: 5px; }\n  .addressbar .dots span {\n    width: 8px; height: 8px; border-radius: 50%; background: var(--line);\n  }\n  .addressbar .url { flex: 1; opacity: 0.9; }\n  .page {\n    min-height: 90px;\n    display: grid;\n    place-items: center;\n    font-size: 1.4rem;\n    font-weight: 600;\n    letter-spacing: 0.02em;\n    padding: 18px;\n    transition: background 0.15s ease;\n  }\n  .page.mismatch { background: color-mix(in srgb, var(--bad, #e5484d) 18%, transparent); }\n  .log {\n    max-height: 170px;\n    overflow-y: auto;\n  }\n  .log .row { opacity: 0; animation: fade-in 0.15s ease forwards; }\n  .log .go { color: var(--accent, #7dd3fc); }\n  .log .ok { color: var(--good, #4ade80); }\n  .log .drop { color: var(--muted); text-decoration: line-through; }\n  .log .warn { color: var(--bad, #e5484d); font-weight: 700; }\n  @keyframes fade-in { to { opacity: 1; } }","\"use strict\";\n  const $ = (id) => document.getElementById(id);\n\n  let mode = \"old\";\n  let activeController = null; \u002F\u002F only used in \"new\" mode\n  let seq = 0;\n\n  const SPEED_LABELS = { 1: \"very slow\", 2: \"slow\", 3: \"medium\", 4: \"fast\", 5: \"very fast\" };\n  const SPEED_MS = { 1: 1800, 2: 1200, 3: 800, 4: 450, 5: 220 };\n\n  function baseLatency() {\n    const v = Number($(\"speed\").value);\n    const base = SPEED_MS[v];\n    return Math.round(base * (0.8 + Math.random() * 0.4));\n  }\n\n  function setStatus(text, kind = \"info\") {\n    $(\"statusText\").textContent = text;\n    $(\"dot\").className = \"dot \" + kind;\n  }\n\n  function logRow(html, cls) {\n    const row = document.createElement(\"div\");\n    row.className = \"row \" + cls;\n    row.textContent = html;\n    $(\"log\").appendChild(row);\n    $(\"log\").scrollTop = $(\"log\").scrollHeight;\n  }\n\n  function checkMismatch() {\n    const addr = $(\"addr\").textContent;\n    const shown = $(\"page\").dataset.route || \"\";\n    const mismatched = addr !== shown && shown !== \"\";\n    $(\"page\").classList.toggle(\"mismatch\", mismatched);\n    if (mismatched) {\n      setStatus(`Mismatch: address bar says ${addr}, but the page shows ${shown}.`, \"bad\");\n      logRow(`⚠ MISMATCH — URL is ${addr}, rendered page is ${shown}`, \"warn\");\n    }\n    return mismatched;\n  }\n\n  function render(target, latency, navId) {\n    $(\"page\").textContent = target;\n    $(\"page\").dataset.route = target;\n    logRow(`✓ nav#${navId} rendered ${target} (took ${latency}ms)`, \"ok\");\n    if (!checkMismatch()) {\n      setStatus(`Showing ${target} — matches the address bar.`, \"good\");\n    }\n  }\n\n  function navigate(target, forcedLatency) {\n    seq += 1;\n    const navId = seq;\n    const latency = forcedLatency ?? baseLatency();\n\n    \u002F\u002F The browser updates the URL right away in both strategies — that part\n    \u002F\u002F was never the bug. What differs is what happens to the render that follows.\n    $(\"addr\").textContent = target;\n    logRow(`→ nav#${navId} started: navigate to ${target} (~${latency}ms)`, \"go\");\n\n    if (mode === \"old\") {\n      \u002F\u002F pushState + popstate: nothing tracks earlier in-flight navigations.\n      setTimeout(() => render(target, latency, navId), latency);\n    } else {\n      \u002F\u002F Navigation API: a new navigate event aborts the previous one's signal.\n      if (activeController) {\n        activeController.abort();\n        logRow(`✕ nav#${navId} aborted the still-pending previous navigation`, \"drop\");\n      }\n      const controller = new AbortController();\n      activeController = controller;\n      setTimeout(() => {\n        if (controller.signal.aborted) {\n          logRow(`· nav#${navId}'s fetch for ${target} discarded (superseded)`, \"drop\");\n          return;\n        }\n        render(target, latency, navId);\n      }, latency);\n    }\n  }\n\n  $(\"modeSeg\").addEventListener(\"click\", (e) => {\n    const btn = e.target.closest(\".seg-btn\");\n    if (!btn) return;\n    mode = btn.dataset.mode;\n    [...$(\"modeSeg\").children].forEach((b) => b.setAttribute(\"aria-pressed\", String(b === btn)));\n    setStatus(`Switched to: ${mode === \"old\" ? \"old way (pushState)\" : \"new way (intercept + signal)\"}. Try the race preset.`, \"info\");\n  });\n\n  $(\"speed\").addEventListener(\"input\", () => {\n    $(\"speedLabel\").textContent = SPEED_LABELS[$(\"speed\").value];\n  });\n\n  $(\"goHome\").addEventListener(\"click\", () => navigate(\"\u002Fhome\"));\n  $(\"goReports\").addEventListener(\"click\", () => navigate(\"\u002Freports\"));\n\n  $(\"presetRace\").addEventListener(\"click\", () => {\n    navigate(\"\u002Freports\", 1300); \u002F\u002F clicked first, resolves slow\n    setTimeout(() => navigate(\"\u002Fhome\", 350), 120); \u002F\u002F clicked second, resolves fast\n  });\n\n  $(\"reset\").addEventListener(\"click\", () => {\n    if (activeController) activeController.abort();\n    activeController = null;\n    seq = 0;\n    $(\"addr\").textContent = \"\u002F\";\n    $(\"page\").textContent = \"—\";\n    $(\"page\").dataset.route = \"\";\n    $(\"page\").classList.remove(\"mismatch\");\n    $(\"log\").innerHTML = \"\";\n    setStatus(\"Ready — try the preset first.\", \"info\");\n  });",{"height":11,"autorun":12},520,true,{"slug":4,"title":14,"excerpt":15,"coverUrl":16,"vertical":17},"Your Router Doesn't Intercept Navigation. It Reacts To It.","Double-click a link during a slow route change and most SPA routers render two pages and settle on the wrong one — because they're listening for navigation after it already happened. The Navigation API lets you stop it before it starts.","\u002Fmedia\u002Fcovers\u002Fnavigation-api-intercept-navigation.png",{"slug":18},"dev",[20,34,46],{"id":21,"slug":18,"name":22,"tagline":23,"description":24,"accentFrom":25,"accentTo":26,"icon":27,"defaultLocale":28,"locales":29,"features":31,"position":33},"019fe637-3d33-714b-b57f-23e163ffca0c","Web Development","Read it. Run it. Prove it.","A post a day on modern web development — most with an editable playground and a quiz that explains every answer. Free, no account needed.","violet-500","cyan-400","◇","en",[28,30],"fa",{"courses":12,"paths":12,"articles":12,"exams":32,"flashcards":32,"packages":12,"community":12,"certificates":12,"teams":12,"commerce":12},false,0,{"id":35,"slug":36,"name":37,"tagline":38,"description":39,"accentFrom":40,"accentTo":25,"icon":41,"defaultLocale":28,"locales":42,"features":44,"position":45},"019fe637-3dc2-754c-8657-0f175bfee7c6","lang","Languages","Learn a language the way you learn a codebase.","Grammar explained the way good documentation explains an API — one idea at a time, each with a quiz.","amber-400","⌘",[28,30,43],"es",{"courses":32,"paths":32,"articles":12,"exams":32,"flashcards":12,"packages":32,"community":12,"certificates":12,"teams":32,"commerce":32},2,{"id":47,"slug":48,"name":49,"tagline":50,"description":51,"accentFrom":52,"accentTo":53,"icon":54,"defaultLocale":28,"locales":55,"features":56,"position":57},"7b3c16f2-931d-410e-802e-e1fa4edab7de","soft","Soft Skills","The half of the job nobody wrote documentation for.","Weekly, on the parts of working life that decide more than your code does — first weeks, meetings, interviews, promotions, and the people around you. Written from what actually happens, and recorded as a podcast you can listen to on the walk.","emerald-400","teal-300","◉",[28],{"courses":32,"paths":32,"articles":12,"exams":32,"flashcards":32,"packages":32,"community":12,"certificates":32,"teams":32,"commerce":32},3,[59,63,67,71,75,79,83,87,91,95,99,103],{"slug":60,"name":61,"articles":62},"webdev","Webdev",77,{"slug":64,"name":65,"articles":66},"frontend","Frontend",65,{"slug":68,"name":69,"articles":70},"javascript","Javascript",64,{"slug":72,"name":73,"articles":74},"css","Css",29,{"slug":76,"name":77,"articles":78},"tutorial","Tutorial",16,{"slug":80,"name":81,"articles":82},"typescript","Typescript",11,{"slug":84,"name":85,"articles":86},"performance","Performance",10,{"slug":88,"name":89,"articles":90},"react","React",8,{"slug":92,"name":93,"articles":94},"grammar","Grammar",6,{"slug":96,"name":97,"articles":98},"node","Node",5,{"slug":100,"name":101,"articles":102},"programming","Programming",4,{"slug":104,"name":105,"articles":102},"html","Html"]