feat(embed): add embeddable charts

docs/embed.md

@@ -0,0 +1,79 @@
+# Embed Routes
+
+Public iframe-embedding surface for InferenceX charts. Partner sites can embed any supported chart by iframing an `/embed/*` URL.
+
+## URL parameter contract
+
+Embed URLs use **the same `g_*` / `i_*` parameter keys as the main `/inference` site** — there is no separate embed-specific key contract to maintain. If a site key is renamed or a new key is added, the embed URL automatically benefits from the change. The only embed-specific key is `i_chart` (which chart variant to display — the main site renders both E2E and interactivity together, embeds show only one).
+
+## Supported routes
+
+| Route            | Chart                                    |
+| ---------------- | ---------------------------------------- |
+| `/embed/scatter` | Scatter (E2E throughput / interactivity) |
+
+## `/embed/scatter`
+
+### URL shape
+
+```
+/embed/scatter?g_model=DeepSeek-R1-0528&i_seq=8k%2F1k&i_prec=fp4
+  &i_metric=y_tpPerGpu&i_active=b200_sglang,gb300_dynamo-sglang&i_chart=e2e
+```
+
+### Parameters
+
+| Key        | Type   | Default            | Notes                                                                                                                                                                                                                                                                                                          |
+| ---------- | ------ | ------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `g_model`  | string | `DeepSeek-R1-0528` | Display model name — same as `g_model` on the main site.                                                                                                                                                                                                                                                       |
+| `i_seq`    | string | `8k/1k`            | Sequence string (e.g. `8k/1k`, `1k/1k`, `1k/8k`) — same as `i_seq` on the main site.                                                                                                                                                                                                                           |
+| `i_prec`   | string | `fp4`              | Comma-separated precision keys (e.g. `fp4`, `fp8`, `bf16`) — same as `i_prec` on the main site.                                                                                                                                                                                                                |
+| `i_metric` | string | `y_tpPerGpu`       | Y-axis metric key (e.g. `y_tpPerGpu`, `y_costh`) — same as `i_metric` on the main site.                                                                                                                                                                                                                        |
+| `i_active` | string | `` (all visible)   | Comma-separated hwKey allow-list (e.g. `b200_sglang,gb300_dynamo-sglang`). When set, the embed legend and chart universe are restricted to exactly these GPUs. Viewers can toggle them on/off but cannot add GPUs outside this set. When absent, all GPUs for the selected model/sequence/precision are shown. |
+| `i_chart`  | string | `e2e`              | Chart variant to render: `e2e` or `interactivity`. Embed-only key — the main site renders both charts together.                                                                                                                                                                                                |
+
+All other `g_*` / `i_*` keys recognized by the main site (e.g. `i_scale`, `i_hc`, `i_nolabel`) are passed through as-is and respected by the embed — the provider stack is identical. Unknown keys are silently ignored.
+
+### `i_active` — hwKey format
+
+Each hwKey token encodes hardware and inference framework together, separated by an underscore (e.g. `b200_sglang`, `gb300_dynamo-sglang`). To find valid hwKey values, visit `/inference` on the live site, open the legend, and note the identifiers shown — or use **Export → Copy embed** to get a ready-made URL with your current filters already encoded.
+
+### `i_metric` — accepted values
+
+Full `y_*` internal keys (e.g. `y_tpPerGpu`, `y_costh`). The authoritative list is in `packages/app/src/lib/chart-utils.ts` (`Y_AXIS_METRICS`).
+
+## Embed mode behavior
+
+- Site header, footer, background decorations, and navigation are hidden on all `/embed/*` routes.
+- A "SemiAnalysis InferenceX →" link appears in the chart caption (`Source: …`), deep-linking to the equivalent canonical dashboard URL. The canonical URL is built from the same embed params (minus `i_chart`), so opening it reproduces the same chart state on the main site.
+- `robots: noindex, nofollow` is set on all embed routes — they won't appear in search results.
+- An `embed_view` PostHog event is fired once on mount, capturing `referrer`, `embed_host`, `embed_chart`, `model` (`g_model`), `sequence` (`i_seq`), `precisions` (`i_prec`), `gpus` (from `i_active`), and `y_metric` (`i_metric`). This makes external embed traffic attributable in analytics.
+
+## CSP / framing
+
+Embed routes (`/embed/*`) set `Content-Security-Policy: frame-ancestors *`, allowing iframing from any origin.
+
+All other routes set `frame-ancestors 'self'` and `X-Frame-Options: SAMEORIGIN`, blocking third-party framing.
+
+## Recommended iframe snippet
+
+```html
+<iframe
+  src="https://inferencex.semianalysis.com/embed/scatter?g_model=DeepSeek-R1-0528&i_seq=8k%2F1k&i_prec=fp4&i_metric=y_tpPerGpu"
+  width="800"
+  height="500"
+  loading="lazy"
+  referrerpolicy="origin"
+  allow="clipboard-write"
+  style="border:none;border-radius:8px"
+>
+</iframe>
+```
+
+**Important — `referrerpolicy="origin"`:** many partner sites ship `<meta name="referrer" content="no-referrer">`. Without an explicit `referrerpolicy="origin"` on the `<iframe>`, the embed loses all referrer information, which breaks traffic attribution in the `embed_view` event. Use `origin` (not `strict-origin-when-cross-origin`) so the referrer is always sent.
+
+`allow="clipboard-write"` is optional but needed if you want clipboard actions inside the embedded chart to work from the parent page.
+
+You can copy the same ready-made iframe snippet from the dashboard: open the chart's **Export** menu and choose **Copy embed**.
+
+For very short iframes (around 300–400 px tall), prefer `width` ≥ 1024 if you want the legend as a side column; below that width the legend uses a collapsible row at the bottom.

docs/index.md

@@ -15,3 +15,4 @@ Design rationale and non-obvious conventions. See [CLAUDE.md](../CLAUDE.md) for
 - [Data Transforms](./data-transforms.md) — Full pipeline from BenchmarkRow to RenderableGraph: type hierarchy, hardware key construction, derived metrics, memoization strategy
 - [State Ownership](./state-ownership.md) — Which context owns which state, availability filtering cascade, comparison date mechanics, URL param sync
 - [Blog](./blog.md) — MDX content system, SEO features (OG images, RSS, llms.txt, JSON-LD), TOC sidebar, reading progress, heading links, analytics events
+- [Embed](./embed.md) — Stable iframe-embedding surface: `/embed/*` routes, URL contract, stability guarantee, CSP, recommended snippet

packages/app/cypress/component/chart-buttons.cy.tsx

@@ -87,6 +87,65 @@ describe('ChartButtons', () => {
     });
   });
 
+  describe('embed scatter link', () => {
+    it('shows Copy embed when getEmbedUrl is provided and copies an iframe snippet to clipboard', () => {
+      const embedUrl = 'https://example.com/embed/scatter?model=dsr1';
+      cy.window().then((win) => {
+        cy.stub(win.navigator.clipboard, 'writeText').as('clipboardWrite');
+      });
+      cy.mount(
+        <div style={{ position: 'relative', width: 400, height: 200 }}>
+          <div id="test-chart">Chart content</div>
+          <ChartButtons
+            chartId="test-chart"
+            analyticsPrefix="test"
+            onExportCsv={cy.stub()}
+            getEmbedUrl={() => embedUrl}
+          />
+        </div>,
+      );
+      cy.get('[data-testid="export-button"]').click();
+      cy.get('[data-testid="export-embed-button"]').should('be.visible').click();
+      cy.get('@clipboardWrite').should('have.been.calledOnce');
+      cy.get('@clipboardWrite')
+        .invoke('getCall', 0)
+        .its('args')
+        .its(0)
+        .should('include', embedUrl)
+        .and('include', '<iframe')
+        .and('include', 'referrerpolicy="origin"');
+      cy.get('[data-testid="export-embed-button"]').should('contain.text', 'Copied!');
+    });
+
+    it('shows the popover when only getEmbedUrl is provided', () => {
+      cy.window().then((win) => {
+        cy.stub(win.navigator.clipboard, 'writeText').as('clipboardWrite');
+      });
+      cy.mount(
+        <div style={{ position: 'relative', width: 400, height: 200 }}>
+          <div id="test-chart">Chart content</div>
+          <ChartButtons
+            chartId="test-chart"
+            analyticsPrefix="test"
+            getEmbedUrl={() => 'https://example.com/embed/scatter?model=dsr1'}
+          />
+        </div>,
+      );
+      cy.get('[data-testid="export-button"]').click();
+      cy.get('[data-testid="export-png-button"]').should('be.visible');
+      cy.get('[data-testid="export-csv-button"]').should('not.exist');
+      cy.get('[data-testid="export-embed-button"]').should('be.visible');
+      cy.get('[data-testid="export-embed-button"]').click();
+      cy.get('@clipboardWrite').should('have.been.calledOnce');
+      cy.get('@clipboardWrite')
+        .invoke('getCall', 0)
+        .its('args')
+        .its(0)
+        .should('include', '<iframe')
+        .and('include', 'https://example.com/embed/scatter?model=dsr1');
+    });
+  });
+
   describe('hideZoomReset', () => {
     it('hides zoom reset button when hideZoomReset is true', () => {
       cy.mount(

packages/app/cypress/e2e/embed-scatter.cy.ts

@@ -0,0 +1,228 @@
+function joinHeader(headers: Record<string, string | string[] | undefined>, name: string): string {
+  const pair = Object.entries(headers).find(([k]) => k.toLowerCase() === name.toLowerCase());
+  const v = pair?.[1];
+  if (Array.isArray(v)) return v.join(', ');
+  return typeof v === 'string' ? v : '';
+}
+
+describe('Embed — Scatter Chart', () => {
+  describe('default URL', () => {
+    before(() => {
+      cy.visit('/embed/scatter');
+    });
+
+    it('renders the embed root container', () => {
+      cy.get('[data-testid="embed-root"]').should('exist');
+    });
+
+    it('does not render the site header or footer', () => {
+      cy.get('[data-testid="header"]').should('not.exist');
+      cy.get('[data-testid="footer"]').should('not.exist');
+    });
+
+    it('renders an SVG chart with real data', () => {
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.get('[data-testid="embed-scatter-figure"]').find('svg').should('exist');
+      cy.contains('No data available').should('not.exist');
+    });
+
+    it('shows the SemiAnalysis InferenceX attribution link', () => {
+      cy.get('[data-testid="embed-attribution"]')
+        .should('exist')
+        .should('contain.text', 'SemiAnalysis InferenceX');
+    });
+
+    it('attribution link points to the canonical /inference URL with seeded params', () => {
+      cy.get('[data-testid="embed-attribution"]')
+        .should('have.attr', 'href')
+        .and('include', '/inference?')
+        .and('include', 'g_model=DeepSeek-R1-0528')
+        .and('include', 'i_metric=y_tpPerGpu');
+    });
+
+    it('does not show the Shift+Scroll instructions text', () => {
+      cy.get('[data-testid="embed-chart-instructions"]').should('have.text', '');
+    });
+
+    it('has robots noindex meta tag', () => {
+      // Root layout may emit its own `meta[name="robots"]` first; embed routes add a noindex tag too.
+      cy.get('meta[name="robots"][content*="noindex"]').should('exist');
+    });
+  });
+
+  describe('custom params (site-style keys)', () => {
+    before(() => {
+      cy.visit('/embed/scatter?g_model=DeepSeek-R1-0528&i_seq=8k%2F1k&i_prec=fp4&i_metric=y_costh');
+    });
+
+    it('renders chart with the custom y metric', () => {
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.contains('No data available').should('not.exist');
+    });
+
+    it('canonical link reflects the y metric override', () => {
+      cy.get('[data-testid="embed-attribution"]')
+        .should('have.attr', 'href')
+        .and('include', 'i_metric=y_costh');
+    });
+
+    it('canonical link does not include i_chart', () => {
+      cy.get('[data-testid="embed-attribution"]')
+        .should('have.attr', 'href')
+        .and('not.include', 'i_chart');
+    });
+  });
+
+  describe('i_active param restricts legend to creator-selected GPUs', () => {
+    before(() => {
+      cy.visit('/embed/scatter?i_active=b200_sglang');
+    });
+
+    it('renders chart without "No data available"', () => {
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.get('[data-testid="embed-scatter-figure"]').find('svg').should('exist');
+      cy.contains('No data available').should('not.exist');
+    });
+
+    it('legend contains only the allowed GPU', () => {
+      // Each GPU renders as a <li> inside [data-testid="chart-legend"].
+      // With i_active=b200_sglang, only that GPU is in the allow-list, so
+      // exactly 1 <li> should appear (fp-indicators and controls use <div>).
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.contains('No data available').should('not.exist');
+      cy.get('[data-testid="embed-legend-panel"] [data-testid="chart-legend"] li').should(
+        'have.length',
+        1,
+      );
+    });
+  });
+
+  describe('i_chart param selects chart variant', () => {
+    it('renders e2e chart by default', () => {
+      cy.visit('/embed/scatter');
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+    });
+
+    it('renders interactivity chart when i_chart=interactivity', () => {
+      cy.visit('/embed/scatter?i_chart=interactivity');
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.contains('No data available').should('not.exist');
+    });
+  });
+
+  describe('CSP headers', () => {
+    it('embed routes allow framing from any origin', () => {
+      cy.request('/embed/scatter').then((resp) => {
+        const csp = joinHeader(resp.headers, 'content-security-policy');
+        expect(csp).to.include('frame-ancestors *');
+      });
+    });
+
+    it('non-embed routes restrict framing to self', () => {
+      cy.request('/').then((resp) => {
+        const csp = joinHeader(resp.headers, 'content-security-policy');
+        expect(csp).to.include("frame-ancestors 'self'");
+      });
+    });
+  });
+
+  describe('viewport responsiveness', () => {
+    it('renders chart at 600×500 (narrow iframe)', () => {
+      cy.viewport(600, 500);
+      cy.visit('/embed/scatter');
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.get('[data-testid="embed-scatter-figure"]').find('svg').should('exist');
+      cy.get('[data-testid="embed-legend-panel"]').should('be.visible');
+    });
+
+    it('legend dropdown stays inside the card at short height (800×400)', () => {
+      cy.viewport(800, 400);
+      cy.visit('/embed/scatter');
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.get('[data-testid="embed-legend-panel"] summary').click();
+      cy.get('[data-testid="embed-legend-dropdown"]').should('be.visible');
+      cy.get('[data-testid="embed-scatter-figure"] [data-slot="card"]').then(($card) => {
+        cy.get('[data-testid="embed-legend-dropdown"]').then(($dd) => {
+          const cardTop = $card[0].getBoundingClientRect().top;
+          const ddTop = $dd[0].getBoundingClientRect().top;
+          expect(ddTop).to.be.at.least(cardTop);
+        });
+      });
+    });
+
+    it('renders chart at 800×600', () => {
+      cy.viewport(800, 600);
+      cy.visit('/embed/scatter');
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.get('[data-testid="embed-scatter-figure"]').find('svg').should('exist');
+      cy.get('[data-testid="embed-legend-panel"]').should('be.visible');
+    });
+
+    it('fits short iframe height without document scroll (1024×420)', () => {
+      cy.viewport(1024, 420);
+      cy.visit('/embed/scatter');
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.get('[data-testid="scatter-graph"] svg').should('exist');
+      cy.window().then((win) => {
+        expect(win.document.documentElement.scrollHeight).to.be.at.most(420);
+      });
+      cy.get('[data-testid="scatter-graph"] svg')
+        .invoke('attr', 'height')
+        .then((h) => {
+          const n = Number(h);
+          expect(n).to.be.at.least(240);
+          expect(n).to.be.below(600);
+        });
+    });
+
+    it('floors chart SVG height at 240px when iframe is very short (1024×250)', () => {
+      cy.viewport(1024, 250);
+      cy.visit('/embed/scatter');
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.get('[data-testid="scatter-graph"] svg').invoke('attr', 'height').should('eq', '240');
+      cy.window().then((win) => {
+        expect(win.document.documentElement.scrollHeight).to.be.above(
+          win.document.documentElement.clientHeight,
+        );
+      });
+    });
+  });
+
+  describe('unofficial run overlay', () => {
+    it('renders overlay points when unofficialrun param is provided', () => {
+      cy.intercept('GET', '/api/unofficial-run*', {
+        statusCode: 200,
+        body: {
+          runInfos: [
+            {
+              id: 99999,
+              branch: 'test-branch',
+              url: 'https://github.com/test/repo/actions/runs/99999',
+            },
+          ],
+          benchmarks: [
+            {
+              model: 'DeepSeek-R1-0528',
+              sequence: '8k/1k',
+              chart_type: 'e2e',
+              precision: 'fp4',
+              hw_type: 'b200_sglang',
+              tp: 8,
+              concurrency: 64,
+              ttft_ms: 300,
+              tpot_ms: 10,
+              e2e_latency_ms: 600,
+              total_throughput: 2000,
+              throughput_per_gpu: 250,
+              run_url: 'https://github.com/test/repo/actions/runs/99999',
+            },
+          ],
+        },
+      }).as('unofficialRun');
+
+      cy.visit('/embed/scatter?unofficialrun=99999');
+      cy.get('[data-testid="embed-scatter-figure"]', { timeout: 15000 }).should('exist');
+      cy.get('[data-testid="embed-scatter-figure"]').find('svg').should('exist');
+    });
+  });
+});