No render-blocking fonts

What TestSprite reads

The testing agent reads this JSON, opens the deployed URL in headless Chromium, executes each action step, evaluates each assertion. Verdict: passed / failed / blocked / inconclusive.

{
  "projectId": "1ad26753-ee03-4689-8f0f-6fa5d67c5c72",
  "type": "frontend",
  "name": "Performance — no render-blocking webfont requests on the index",
  "description": "Webfonts that block first paint kill LCP. Either preload webfonts with <link rel='preload' as='font'> + display=swap, OR use system-stack fonts, OR self-host with font-display:swap.",
  "priority": "p2",
  "metadata": {
    "category": "performance",
    "stage": "all"
  },
  "planSteps": [
    {
      "type": "action",
      "description": "Navigate to the homepage"
    },
    {
      "type": "assertion",
      "description": "Verify all font requests on the page either declare font-display: swap in CSS, OR use <link rel='preload' as='font' crossorigin> tags, OR the page uses only system-stack fonts (no @font-face external requests)"
    }
  ]
}