tuono/apps/documentation/public/polyfill-db.json

{
  "polyfills": [
    {
      "identifier": "HTMLElement",
      "import": {
        "package": "@lit-labs/ssr-dom-shim",
        "name": "HTMLElement"
      }
    },
    {
      "identifier": "customElements",
      "import": {
        "package": "@lit-labs/ssr-dom-shim",
        "name": "customElements"
      }
    }
  ]
}