[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"verticals":3,"playground-nextjs-weekly-instant-navigations-partial-prefetching":44,"search-suggestions":58},[4,20,32],{"id":5,"slug":6,"name":7,"tagline":8,"description":9,"accentFrom":10,"accentTo":11,"icon":12,"defaultLocale":13,"locales":14,"features":16,"position":19},"019fe637-3d33-714b-b57f-23e163ffca0c","dev","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",[13,15],"fa",{"courses":17,"paths":17,"articles":17,"exams":18,"flashcards":18,"packages":17,"community":17,"certificates":17,"teams":17,"commerce":17},true,false,0,{"id":21,"slug":22,"name":23,"tagline":24,"description":25,"accentFrom":26,"accentTo":10,"icon":27,"defaultLocale":13,"locales":28,"features":30,"position":31},"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","⌘",[13,15,29],"es",{"courses":18,"paths":18,"articles":17,"exams":18,"flashcards":17,"packages":18,"community":17,"certificates":17,"teams":18,"commerce":18},2,{"id":33,"slug":34,"name":35,"tagline":36,"description":37,"accentFrom":38,"accentTo":39,"icon":40,"defaultLocale":13,"locales":41,"features":42,"position":43},"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","◉",[13],{"courses":18,"paths":18,"articles":17,"exams":18,"flashcards":18,"packages":18,"community":17,"certificates":18,"teams":18,"commerce":18},3,{"slug":45,"title":46,"summary":47,"html":48,"css":49,"js":50,"config":51,"doc":53},"nextjs-weekly-instant-navigations-partial-prefetching","Next.js Instant Navigations — interactive playground",null,"\u003Cdiv class=\"pg\">\n    \u003Ch1 class=\"pg-title\">🎮 Watch a navigation go through three stages\u003C\u002Fh1>\n    \u003Cp class=\"pg-sub\">\n      This is a \u003Cb>model\u003C\u002Fb> of how Next.js's Instant Navigations (Partial Prefetching + the App Shell) decide what\n      paints instantly versus what streams in after a click — not a running Next.js server. Pick whether Partial\n      Prefetching is on, pick where the \u003Ccode>params\u003C\u002Fcode> are awaited, then click the link to simulate the\n      navigation.\n    \u003C\u002Fp>\n\n    \u003Cdiv class=\"banner info show\">\n      Simulated model — walks the documented navigation-stage rules in plain JS. No real server, no real request. Timings are illustrative only.\n    \u003C\u002Fdiv>\n\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">1\u003C\u002Fspan> Controls\u003C\u002Fdiv>\n      \u003Cdiv class=\"btn-row\" style=\"flex-wrap:wrap; gap:14px;\">\n        \u003Cdiv class=\"field\">\n          \u003Cspan class=\"ctl-label\">Partial Prefetching\u003C\u002Fspan>\n          \u003Cdiv class=\"seg\" id=\"ppSeg\">\n            \u003Cbutton type=\"button\" aria-pressed=\"false\" data-val=\"off\">Off (16.2 and earlier default)\u003C\u002Fbutton>\n            \u003Cbutton type=\"button\" aria-pressed=\"true\" data-val=\"on\">On (16.3+)\u003C\u002Fbutton>\n          \u003C\u002Fdiv>\n        \u003C\u002Fdiv>\n        \u003Cdiv class=\"field\">\n          \u003Cspan class=\"ctl-label\">Where \u003Ccode>params\u003C\u002Fcode> is awaited\u003C\u002Fspan>\n          \u003Cdiv class=\"seg\" id=\"placementSeg\">\n            \u003Cbutton type=\"button\" aria-pressed=\"false\" data-val=\"above\">Above Suspense (wrong)\u003C\u002Fbutton>\n            \u003Cbutton type=\"button\" aria-pressed=\"true\" data-val=\"inside\">Inside Suspense (correct)\u003C\u002Fbutton>\n          \u003C\u002Fdiv>\n        \u003C\u002Fdiv>\n      \u003C\u002Fdiv>\n      \u003Cdiv class=\"btn-row\" style=\"margin-top:12px;\">\n        \u003Cbutton class=\"btn primary\" id=\"navigateBtn\">Click the <Link href=\"\u002Freports\u002F42\">\u003C\u002Fbutton>\n        \u003Cbutton class=\"btn ghost sm\" id=\"resetBtn\">Reset\u003C\u002Fbutton>\n      \u003C\u002Fdiv>\n    \u003C\u002Fdiv>\n\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">2\u003C\u002Fspan> What the browser paints\u003C\u002Fdiv>\n      \u003Cdiv class=\"timeline\">\n        \u003Cspan>\u003Cspan class=\"stage-dot\" id=\"dotShell\">\u003C\u002Fspan>\u003Cb>Stage 1\u003C\u002Fb> App Shell\u003C\u002Fspan>\n        \u003Cspan>\u003Cspan class=\"stage-dot\" id=\"dotPrefetch\">\u003C\u002Fspan>\u003Cb>Stage 2\u003C\u002Fb> per-link prefetch\u003C\u002Fspan>\n        \u003Cspan>\u003Cspan class=\"stage-dot\" id=\"dotNav\">\u003C\u002Fspan>\u003Cb>Stage 3\u003C\u002Fb> navigation \u002F stream\u003C\u002Fspan>\n      \u003C\u002Fdiv>\n      \u003Cdiv class=\"route\">\n        \u003Cdiv class=\"block\" id=\"headerBlock\">\n          \u003Cspan class=\"ico\">🧭\u003C\u002Fspan>\n          Header + sidebar\n          \u003Cspan class=\"tag\" id=\"headerTag\">waiting\u003C\u002Fspan>\n        \u003C\u002Fdiv>\n        \u003Cdiv class=\"block\" id=\"reportBlock\">\n          \u003Cspan class=\"ico\">📄\u003C\u002Fspan>\n          Report #42\n          \u003Cspan class=\"tag\" id=\"reportTag\">waiting\u003C\u002Fspan>\n        \u003C\u002Fdiv>\n      \u003C\u002Fdiv>\n      \u003Cdiv class=\"status\" id=\"status\">\u003Cspan class=\"dot\">\u003C\u002Fspan> Click the link above to simulate a navigation.\u003C\u002Fdiv>\n      \u003Cdiv class=\"output\" id=\"caption\" style=\"margin-top:8px;\">\u003C\u002Fdiv>\n    \u003C\u002Fdiv>\n\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">3\u003C\u002Fspan> 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\u002F* Demo-specific only — base.css owns tokens, panels, buttons, status, log. *\u002F\n  .route {\n    display: grid;\n    grid-template-columns: 1fr 1fr;\n    gap: 8px;\n    margin: 4px 0 6px;\n  }\n  .block {\n    padding: 12px 8px;\n    text-align: center;\n    border-radius: var(--radius-sm);\n    border: 1px solid var(--line);\n    background: var(--panel-2);\n    font-size: 0.78rem;\n    line-height: 1.35;\n    transition: background .25s, border-color .25s, transform .2s;\n  }\n  .block .ico { display: block; font-size: 1.3rem; margin-bottom: 3px; }\n  .block .tag { display: inline-block; margin-top: 5px; font-size: 0.65rem; padding: 2px 6px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }\n  .block.shell { border-color: color-mix(in oklab, #34d399 55%, var(--line)); background: color-mix(in oklab, #34d399 14%, var(--panel-2)); }\n  .block.shell .tag { color: #34d399; border-color: color-mix(in oklab, #34d399 55%, var(--line)); }\n  .block.fallback { border-color: color-mix(in oklab, #58a6ff 55%, var(--line)); background: color-mix(in oklab, #58a6ff 14%, var(--panel-2)); }\n  .block.fallback .tag { color: #58a6ff; border-color: color-mix(in oklab, #58a6ff 55%, var(--line)); }\n  .block.stream { border-color: color-mix(in oklab, #58a6ff 55%, var(--line)); background: color-mix(in oklab, #58a6ff 14%, var(--panel-2)); }\n  .block.stream .tag { color: #58a6ff; border-color: color-mix(in oklab, #58a6ff 55%, var(--line)); }\n  .block.blank { border-color: color-mix(in oklab, #f0883e 55%, var(--line)); background: color-mix(in oklab, #f0883e 14%, var(--panel-2)); }\n  .block.blank .tag { color: #f0883e; border-color: color-mix(in oklab, #f0883e 55%, var(--line)); }\n  @media (max-width: 640px) {\n    .route { grid-template-columns: 1fr; }\n  }\n  .timeline { display: flex; justify-content: space-between; gap: 6px; margin: -2px 0 10px; font-size: .72rem; color: var(--muted); flex-wrap: wrap; }\n  .timeline b { color: var(--ink); }\n  .stage-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--line); margin-right: 5px; vertical-align: middle; }\n  .stage-dot.on { background: #34d399; }","(function () {\n  var pp = 'on'; \u002F\u002F 'off' | 'on'\n  var placement = 'inside'; \u002F\u002F 'above' | 'inside'\n  var running = false;\n\n  var ppSeg = document.getElementById('ppSeg');\n  var placementSeg = document.getElementById('placementSeg');\n  var navigateBtn = document.getElementById('navigateBtn');\n  var resetBtn = document.getElementById('resetBtn');\n  var headerBlock = document.getElementById('headerBlock');\n  var reportBlock = document.getElementById('reportBlock');\n  var headerTag = document.getElementById('headerTag');\n  var reportTag = document.getElementById('reportTag');\n  var statusEl = document.getElementById('status');\n  var captionEl = document.getElementById('caption');\n  var logEl = document.getElementById('log');\n  var dotShell = document.getElementById('dotShell');\n  var dotPrefetch = document.getElementById('dotPrefetch');\n  var dotNav = document.getElementById('dotNav');\n\n  function wireSeg(seg, onPick) {\n    seg.querySelectorAll('button').forEach(function (btn) {\n      btn.addEventListener('click', function () {\n        seg.querySelectorAll('button').forEach(function (b) { b.setAttribute('aria-pressed', 'false'); });\n        btn.setAttribute('aria-pressed', 'true');\n        onPick(btn.getAttribute('data-val'));\n      });\n    });\n  }\n\n  wireSeg(ppSeg, function (v) { pp = v; reset(); });\n  wireSeg(placementSeg, function (v) { placement = v; reset(); });\n\n  function log(msg) {\n    var line = document.createElement('div');\n    line.textContent = msg;\n    logEl.appendChild(line);\n    logEl.scrollTop = logEl.scrollHeight;\n  }\n\n  function setBlock(block, tag, cls, label) {\n    block.className = 'block' + (cls ? ' ' + cls : '');\n    tag.textContent = label;\n  }\n\n  function setStatus(cls, text) {\n    statusEl.className = 'status ' + cls;\n    statusEl.innerHTML = '\u003Cspan class=\"dot\">\u003C\u002Fspan> ' + text;\n  }\n\n  function reset() {\n    running = false;\n    setBlock(headerBlock, headerTag, '', 'waiting');\n    setBlock(reportBlock, reportTag, '', 'waiting');\n    dotShell.className = 'stage-dot';\n    dotPrefetch.className = 'stage-dot';\n    dotNav.className = 'stage-dot';\n    setStatus('', 'Click the link above to simulate a navigation.');\n    captionEl.textContent = '';\n    logEl.innerHTML = '';\n  }\n\n  function wait(ms) { return new Promise(function (res) { setTimeout(res, ms); }); }\n\n  function shellEligible() {\n    \u002F\u002F Matches the article: Partial Prefetching must be on, AND params must be\n    \u002F\u002F awaited inside the Suspense boundary, not above it in the page component.\n    return pp === 'on' && placement === 'inside';\n  }\n\n  navigateBtn.addEventListener('click', function () {\n    if (running) return;\n    running = true;\n    reset();\n    run();\n  });\n\n  resetBtn.addEventListener('click', reset);\n\n  async function run() {\n    log('Click registered on \u003CLink href=\"\u002Freports\u002F42\">.');\n\n    if (pp === 'off') {\n      setStatus('warn', 'Partial Prefetching is off — no App Shell exists for this route.');\n      captionEl.textContent = 'Every byte of the destination — header, sidebar, and the report — waits on one server round-trip. Nothing paints until it all resolves.';\n      log('No shell to show. Waiting for the full server response (header, sidebar, and Report #42 together)...');\n      await wait(1100);\n      dotNav.className = 'stage-dot on';\n      setBlock(headerBlock, headerTag, 'stream', 'arrived together');\n      setBlock(reportBlock, reportTag, 'stream', 'arrived together');\n      setStatus('good', 'Everything appeared at once, ~1.1s after the click.');\n      log('Full response received. Header, sidebar, and report all painted in the same frame.');\n      running = false;\n      return;\n    }\n\n    if (placement === 'above') {\n      setStatus('warn', 'Partial Prefetching is on, but this route still isn\\'t shell-eligible.');\n      captionEl.textContent = '`params` is awaited in the page component, above the Suspense boundary — so the whole page component depends on the URL, and there is nothing left for the App Shell to prerender.';\n      log('Partial Prefetching checked this route for a static App Shell... none found (params awaited above Suspense).');\n      await wait(1100);\n      dotNav.className = 'stage-dot on';\n      setBlock(headerBlock, headerTag, 'stream', 'arrived together');\n      setBlock(reportBlock, reportTag, 'stream', 'arrived together');\n      setStatus('bad', 'Same blocking behavior as Partial Prefetching off — the flag alone didn\\'t help.');\n      log('This is the gotcha from the article: the config flag is on, but Suspense placement still decides the outcome.');\n      running = false;\n      return;\n    }\n\n    \u002F\u002F Ideal path: Partial Prefetching on, params awaited inside Suspense.\n    dotShell.className = 'stage-dot on';\n    setBlock(headerBlock, headerTag, 'shell', 'App Shell — instant');\n    setStatus('good', 'Stage 1: the App Shell paints immediately.');\n    captionEl.textContent = 'The header and sidebar don\\'t depend on the URL, so they were already prerendered. They appear with no network wait at all.';\n    log('App Shell served instantly: header + sidebar (no dependency on id=42).');\n    await wait(450);\n\n    dotPrefetch.className = 'stage-dot on';\n    setBlock(reportBlock, reportTag, 'fallback', 'Suspense fallback');\n    setStatus('good', 'Stage 2: the Suspense fallback for Report #42 shows while its data streams.');\n    captionEl.textContent = 'Because params is awaited inside the Suspense boundary, the shell has a real placeholder to show here instead of nothing.';\n    log('Per-link prefetch stage: skeleton fallback shown for Report #42.');\n    await wait(700);\n\n    dotNav.className = 'stage-dot on';\n    setBlock(reportBlock, reportTag, 'stream', 'streamed in');\n    setStatus('good', 'Stage 3: Report #42\\'s real content streams in behind the shell.');\n    captionEl.textContent = 'The report data (id-specific, not cacheable into the shell) arrives last and replaces the fallback in place.';\n    log('Report #42 data resolved and streamed into the Suspense boundary.');\n    running = false;\n  }\n\n  reset();\n})();",{"height":52,"autorun":17},520,{"slug":45,"title":54,"excerpt":55,"coverUrl":56,"vertical":57},"Next.js 16.3 Instant Navigations: How Partial Prefetching Works","Next.js 16.3 shipped Instant Navigations: Partial Prefetching plus the App Shell. Learn the model, the Suspense gotcha, and a copy-paste cheat sheet.","\u002Fmedia\u002Fcovers\u002Fnextjs-weekly-instant-navigations-partial-prefetching.png",{"slug":6},[59,63,67,71,75,79,83,87,91,95,99,102],{"slug":60,"name":61,"articles":62},"webdev","Webdev",148,{"slug":64,"name":65,"articles":66},"javascript","Javascript",121,{"slug":68,"name":69,"articles":70},"frontend","Frontend",87,{"slug":72,"name":73,"articles":74},"tutorial","Tutorial",57,{"slug":76,"name":77,"articles":78},"css","Css",44,{"slug":80,"name":81,"articles":82},"performance","Performance",24,{"slug":84,"name":85,"articles":86},"typescript","Typescript",20,{"slug":88,"name":89,"articles":90},"react","React",18,{"slug":92,"name":93,"articles":94},"browser","Browser",14,{"slug":96,"name":97,"articles":98},"programming","Programming",12,{"slug":100,"name":101,"articles":98},"node","Node",{"slug":103,"name":104,"articles":105},"accessibility","Accessibility",10]