Browser property surface

browser.property-surface

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

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Source

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// Test source pending.

Definition

Reads named API and CSS property exposure and descriptors.

Find it in the repository

Collector source: core/signals/browser/property-surface.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/browser/property-surface.ts
Capture membership: Product capture · common/capture/product.ts
Page registration: app/signals/registry.ts
Field projection: core/results/measurement.ts

Execution contract

Signal: browser.property-surface
Collector: browser.property-surface
API / surface: core/signals/browser/property-surface.ts
Timeout: 1000 ms
Companion signals: None
Fixture inputs: Inline owned corpora (listed below)

core/fixtures/browser/property-surface.json · sha256:1842f51c817eaacf9b14124f4dbb9234311c5c093f6d3ff6c68bec2d107dfe86

Exact request inputs

[
  {
    "key": "browser.property-surface.responses",
    "inputs": {
      "window-ReportingObserver": {
        "target": "window",
        "name": "ReportingObserver",
        "camel": null
      },
      "window-CompressionStream": {
        "target": "window",
        "name": "CompressionStream",
        "camel": null
      },
      "window-DecompressionStream": {
        "target": "window",
        "name": "DecompressionStream",
        "camel": null
      },
      "window-scheduler": {
        "target": "window",
        "name": "scheduler",
        "camel": null
      },
      "window-Scheduler": {
        "target": "window",
        "name": "Scheduler",
        "camel": null
      },
      "window-BackgroundFetchManager": {
        "target": "window",
        "name": "BackgroundFetchManager",
        "camel": null
      },
      "window-SyncManager": {
        "target": "window",
        "name": "SyncManager",
        "camel": null
      },
      "window-CookieChangeEvent": {
        "target": "window",
        "name": "CookieChangeEvent",
        "camel": null
      },
      "window-DigitalCredential": {
        "target": "window",
        "name": "DigitalCredential",
        "camel": null
      },
      "window-NDEFReader": {
        "target": "window",
        "name": "NDEFReader",
        "camel": null
      },
      "window-IdleDetector": {
        "target": "window",
        "name": "IdleDetector",
        "camel": null
      },
      "window-CloseWatcher": {
        "target": "window",
        "name": "CloseWatcher",
        "camel": null
      },
      "window-Navigation": {
        "target": "window",
        "name": "Navigation",
        "camel": null
      },
      "window-NavigationActivation": {
        "target": "window",
        "name": "NavigationActivation",
        "camel": null
      },
      "window-ViewTransitionTypeSet": {
        "target": "window",
        "name": "ViewTransitionTypeSet",
        "camel": null
      },
      "window-CSSNestedDeclarations": {
        "target": "window",
        "name": "CSSNestedDeclarations",
        "camel": null
      },
      "window-EditContext": {
        "target": "window",
        "name": "EditContext",
        "camel": null
      },
      "window-CustomStateSet": {
        "target": "window",
        "name": "CustomStateSet",
        "camel": null
      },
      "window-LaunchQueue": {
        "target": "window",
        "name": "LaunchQueue",
        "camel": null
      },
      "window-PressureObserver": {
        "target": "window",
        "name": "PressureObserver",
        "camel": null
      },
      "window-EyeDropper": {
        "target": "window",
        "name": "EyeDropper",
        "camel": null
      },
      "window-DocumentPictureInPicture": {
        "target": "window",
        "name": "DocumentPictureInPicture",
        "camel": null
      },
      "window-BarcodeDetector": {
        "target": "window",
        "name": "BarcodeDetector",
        "camel": null
      },
      "window-TaskController": {
        "target": "window",
        "name": "TaskController",
        "camel": null
      },
      "window-TaskSignal": {
        "target": "window",
        "name": "TaskSignal",
        "camel": null
      },
      "style-accent-color": {
        "target": "style",
        "name": "accent-color",
        "camel": "accentColor"
      },
      "style-scrollbar-gutter": {
        "target": "style",
        "name": "scrollbar-gutter",
        "camel": "scrollbarGutter"
      },
      "style-app-region": {
        "target": "style",
        "name": "app-region",
        "camel": "appRegion"
      },
      "style-font-synthesis-weight": {
        "target": "style",
        "name": "font-synthesis-weight",
        "camel": "fontSynthesisWeight"
      },
      "style-text-emphasis-style": {
        "target": "style",
        "name": "text-emphasis-style",
        "camel": "textEmphasisStyle"
      },
      "style-font-palette": {
        "target": "style",
        "name": "font-palette",
        "camel": "fontPalette"
      },
      "style-rotate": {
        "target": "style",
        "name": "rotate",
        "camel": "rotate"
      },
      "style-container-type": {
        "target": "style",
        "name": "container-type",
        "camel": "containerType"
      },
      "style-hyphenate-character": {
        "target": "style",
        "name": "hyphenate-character",
        "camel": "hyphenateCharacter"
      },
      "style-math-depth": {
        "target": "style",
        "name": "math-depth",
        "camel": "mathDepth"
      },
      "style-initial-letter": {
        "target": "style",
        "name": "initial-letter",
        "camel": "initialLetter"
      },
      "style-view-transition-name": {
        "target": "style",
        "name": "view-transition-name",
        "camel": "viewTransitionName"
      },
      "style-animation-composition": {
        "target": "style",
        "name": "animation-composition",
        "camel": "animationComposition"
      },
      "style-text-wrap": {
        "target": "style",
        "name": "text-wrap",
        "camel": "textWrap"
      },
      "style-animation-timeline": {
        "target": "style",
        "name": "animation-timeline",
        "camel": "animationTimeline"
      },
      "style-timeline-scope": {
        "target": "style",
        "name": "timeline-scope",
        "camel": "timelineScope"
      },
      "prototype-webkitSpeechRecognition.phrases": {
        "target": "prototype",
        "name": "webkitSpeechRecognition.phrases",
        "camel": null
      },
      "prototype-MessagePort.onclose": {
        "target": "prototype",
        "name": "MessagePort.onclose",
        "camel": null
      }
    },
    "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/browser.property-surface. 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/browser/property-surface"

const signal = measurementModule
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