axe-core/lib/checks/label/alt-space-value.json

Accessibility engine for automated Web UI testing

{
  "id": "alt-space-value",
  "evaluate": "alt-space-value-evaluate",
  "metadata": {
    "impact": "critical",
    "messages": {
      "pass": "Element has a valid alt attribute value",
      "fail": "Element has an alt attribute containing only a space character, which is not ignored by all screen readers"
    }
  }
}