{
  "title": "What Is ADA contrast-tool verification examples",
  "testedOn": "2026-10-19",
  "sourceRevision": "ef105fabdf0d83f78cfad95221d5bf57b286bdb3",
  "method": "Independent opaque-sRGB luminance calculation compared with the deployed browser tool status and four text-contrast badges. Six sample pairs, not a client audit.",
  "environment": "Codex in-app browser on macOS. Browser engine/version matrix and assistive-technology behavior were not tested.",
  "limitations": "These are synthetic tool-verification inputs. A pair meeting a numeric threshold does not establish page or site conformance. The displayed ratio is rounded; decisions use the unrounded value.",
  "examples": [
    {
      "foreground": "#000000",
      "background": "#ffffff",
      "ratio": 21.0,
      "display": "21.00",
      "aaNormal": true,
      "aaLarge": true,
      "aaaNormal": true,
      "aaaLarge": true
    },
    {
      "foreground": "#ffffff",
      "background": "#ffffff",
      "ratio": 1.0,
      "display": "1.00",
      "aaNormal": false,
      "aaLarge": false,
      "aaaNormal": false,
      "aaaLarge": false
    },
    {
      "foreground": "#777777",
      "background": "#ffffff",
      "ratio": 4.478089453577215,
      "display": "4.48",
      "aaNormal": false,
      "aaLarge": true,
      "aaaNormal": false,
      "aaaLarge": false
    },
    {
      "foreground": "#767676",
      "background": "#ffffff",
      "ratio": 4.542224959605253,
      "display": "4.54",
      "aaNormal": true,
      "aaLarge": true,
      "aaaNormal": false,
      "aaaLarge": true
    },
    {
      "foreground": "#ffffff",
      "background": "#767676",
      "ratio": 4.542224959605253,
      "display": "4.54",
      "aaNormal": true,
      "aaLarge": true,
      "aaaNormal": false,
      "aaaLarge": true
    },
    {
      "foreground": "#707972",
      "background": "#ffffff",
      "ratio": 4.499795462746351,
      "display": "4.50",
      "aaNormal": false,
      "aaLarge": true,
      "aaaNormal": false,
      "aaaLarge": false
    }
  ]
}