{
  "_type": "curated_open_data",
  "as_of": "2026-07",
  "links": {
    "canonical": "https://verticalmarketplace.ai",
    "docs_for_llms": "https://verticalmarketplace.ai/llms.txt",
    "sell_your_own": "https://verticalmarketplace.ai/api/marketplace/listings",
    "vertical_listings": "https://verticalmarketplace.ai/api/marketplace/listings?vertical=creative-assets"
  },
  "records": [
    {
      "unit": "ratio",
      "value": "4.5:1",
      "metric": "WCAG AA contrast, normal text",
      "standard": "WCAG 2.1 SC 1.4.3",
      "definition": "Minimum contrast between text and background for normal-size text"
    },
    {
      "unit": "ratio",
      "value": "3:1",
      "metric": "WCAG AA contrast, large text",
      "standard": "WCAG 2.1 SC 1.4.3",
      "definition": "Minimum contrast for text at 18pt, or 14pt bold, and larger"
    },
    {
      "unit": "ratio",
      "value": "7:1",
      "metric": "WCAG AAA contrast, normal text",
      "standard": "WCAG 2.1 SC 1.4.6",
      "definition": "Enhanced contrast target for normal-size text"
    },
    {
      "unit": "ratio",
      "value": "4.5:1",
      "metric": "WCAG AAA contrast, large text",
      "standard": "WCAG 2.1 SC 1.4.6",
      "definition": "Enhanced contrast target for large text"
    },
    {
      "unit": "ratio",
      "value": "3:1",
      "metric": "Non-text (UI) contrast, AA",
      "standard": "WCAG 2.1 SC 1.4.11",
      "definition": "Minimum contrast for UI components and graphical objects"
    },
    {
      "unit": "px",
      "value": "8",
      "metric": "Base spacing grid unit",
      "standard": "8-point grid convention",
      "definition": "Common baseline spacing increment for layout and components"
    },
    {
      "unit": "px",
      "value": "16",
      "metric": "Default browser root font size",
      "standard": "CSS user-agent default",
      "definition": "Default value of 1rem in mainstream browsers"
    },
    {
      "unit": "K (D65)",
      "value": "6504",
      "metric": "sRGB white point",
      "standard": "IEC 61966-2-1",
      "definition": "Reference white for the sRGB color space"
    },
    {
      "unit": "ratio",
      "value": "1.618",
      "metric": "Golden-ratio type scale",
      "standard": "Modular scale convention",
      "definition": "Ratio between successive font sizes in a golden-ratio scale"
    },
    {
      "unit": "ratio",
      "value": "1.25",
      "metric": "Major-third type scale",
      "standard": "Modular scale convention",
      "definition": "Ratio between successive sizes in a major-third scale"
    },
    {
      "unit": "px",
      "value": "576",
      "metric": "Bootstrap sm breakpoint",
      "standard": "Bootstrap 5 grid",
      "definition": "Small-device minimum viewport width"
    },
    {
      "unit": "px",
      "value": "768",
      "metric": "Bootstrap md breakpoint",
      "standard": "Bootstrap 5 grid",
      "definition": "Medium-device (tablet) minimum viewport width"
    },
    {
      "unit": "px",
      "value": "992",
      "metric": "Bootstrap lg breakpoint",
      "standard": "Bootstrap 5 grid",
      "definition": "Large-device (desktop) minimum viewport width"
    }
  ],
  "sources": [
    {
      "url": "https://www.w3.org/TR/WCAG21/",
      "name": "W3C Web Content Accessibility Guidelines (WCAG) 2.1"
    },
    {
      "url": "https://www.iec.ch/",
      "name": "IEC 61966-2-1 (sRGB) overview"
    },
    {
      "url": "https://getbootstrap.com/docs/5.3/layout/breakpoints/",
      "name": "Bootstrap 5 breakpoints documentation"
    }
  ],
  "category": "benchmarks",
  "vertical": "creative-assets",
  "data_note": "All records are public-domain facts compiled from the cited sources as of the asOf date. This content is authored and served by the platform itself — it is not seller data, so the marketplace's zero-storage promise about seller datasets is unaffected.",
  "record_count": 13,
  "what_this_is": "A platform-published open-data listing curated by Open Data Desk, the marketplace's in-house public-data seller. It is real free inventory: it counts in marketplace statistics and is purchasable for $0 through the normal purchase flow, which delivers this payload with an Ed25519-signed receipt.",
  "record_schema": {
    "unit": "Unit or notation the value is expressed in",
    "value": "The published benchmark value",
    "metric": "Name of the design or accessibility benchmark",
    "standard": "Standard or convention the value comes from",
    "definition": "Plain-language meaning of the benchmark"
  },
  "buyer_use_cases": [
    "Configure design tokens and CI checks that enforce WCAG-compliant contrast",
    "Standardize spacing, breakpoints and type scales across a design system",
    "Audit existing brand assets against public accessibility thresholds"
  ]
}