Layout differentials

dom.layout-differentials

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Selected signal results for external comparison. Field statuses, controls and exact values are retained.

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// Test source pending.

Definition

Measures owned MathML, text, transform and accumulation cases with hidden and owned-font controls.

Find it in the repository

Collector source: core/signals/dom/layout-differentials.ts
Export: measurementModule · Signal factory
Field definitions: core/definitions/dom/layout-differentials.ts
Capture membership: Product capture · common/capture/product.ts
Page registration: app/signals/registry.ts
Field projection: core/results/measurement.ts

Execution contract

Signal: dom.layout-differentials
Collector: dom.layout-differentials
API / surface: core/signals/dom/layout-differentials.ts
Timeout: 1250 ms
Companion signals: None
Fixture inputs: core/fixtures/fonts/hyphenation.ttf

core/fixtures/dom/layout-differentials.ts · sha256:72bcfd9efafd15a271a359d3073d8f3eb3a0829cedb77ad2bb1fb623f8cf4781
core/fixtures/fonts/hyphenation.json · sha256:ebe471893b9a47b022d783bed318f9d4e230366d713bbb50e26e66a3b4553677

Exact request inputs

[
  {
    "key": "dom.layout-differentials.responses",
    "inputs": {
      "operator": {
        "id": "operator",
        "kind": "math",
        "text": "∑",
        "style": "",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "stretch": {
        "id": "stretch",
        "kind": "stretch",
        "text": "(x)",
        "style": "",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "accent": {
        "id": "accent",
        "kind": "accent",
        "text": "x^",
        "style": "",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "text": {
        "id": "text",
        "kind": "text",
        "text": "Á fj 国 🧭",
        "style": "",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "transformed-text": {
        "id": "transformed-text",
        "kind": "text",
        "text": "Á fj 国 🧭",
        "style": "transform:translate(0.5px,1.25px) scale(1.125);transform-origin:0 0;",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "short-run": {
        "id": "short-run",
        "kind": "text",
        "text": "mmmm",
        "style": "",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "long-run": {
        "id": "long-run",
        "kind": "text",
        "text": "mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm",
        "style": "",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "border-visible": {
        "id": "border-visible",
        "kind": "text",
        "text": "m",
        "style": "border:0.5px solid black;",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "border-hidden": {
        "id": "border-hidden",
        "kind": "text",
        "text": "m",
        "style": "display:none;border:0.5px solid black;",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": null
      },
      "owned-font-control": {
        "id": "owned-font-control",
        "kind": "owned",
        "text": "mmmm",
        "style": "",
        "repetitions": 2,
        "language": "en-US",
        "direction": "ltr",
        "font": "16px monospace",
        "ownedFontSha256": "51a3d9d6f4a3d3b820cbfe6c3b770e4d608f078a7a59ff3013a8e97c6604f461"
      }
    },
    "controls": {}
  }
]

One collector runs per invocation. Results and JSON select this signal’s fields; any companions execute in the same collector.

Generated source manifest lists runtime files, fixture URLs and content digests for this build. The Source tab provides a copyable console sample.

Run and edit locally

From the repository root, start the Astro app, then open /signals/dom.layout-differentials. Edit the collector source and reload the page to load its new build.

pnpm run dev:web

In a browser module served by this repository’s Vite graph:

import { createCollector } from "/core/collect"
import { measurementModule } from "/core/signals/dom/layout-differentials"
import asset0 from "/core/fixtures/fonts/hyphenation.ttf?url"

const signal = measurementModule(asset0)
const collector = createCollector()
const suite = { signals: [signal] }
const result = await collector.collect(suite)

Reuse the collector owner for repeated calls so collection can enforce cleanup. This returns the collector’s raw result; app/signals/projection.ts selects the retained fields shown on this page.

rg -n 'measurementModule' core app tests
pnpm run check
pnpm run test tests/unit/app/focused-projection.test.ts