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chromium/third_party/blink/web_tests/external/wpt/fedcm/support/resolve.html 

<!DOCTYPE html>
<script>
async function doResolve() {
  let params = new URLSearchParams(document.location.search);
  let options = {};
  if (params.get("accountId")) {
    options.accountId = params.get("accountId");
  }
  let token = "resolved token";
  if (params.get("selected")) {
    token = "account=" + params.get("selected");
  }
  IdentityProvider.resolve(token, options);
}
window.onload = doResolve;
</script>