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chromium/third_party/blink/web_tests/external/wpt/import-maps/multiple-import-maps/basic.html 

<!DOCTYPE html>
<html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const log = [];
</script>
<script type="importmap" onerror="log.push('onerror 1')">
{
  "imports": {
    "../resources/log.js?pipe=sub&name=A1": "../resources/log.js?pipe=sub&name=B1",
    "../resources/log.js?pipe=sub&name=A2": "../resources/log.js?pipe=sub&name=B2"
  }
}
</script>
<script type="importmap" onerror="log.push('onerror 2')">
{
  "imports": {
    "../resources/log.js?pipe=sub&name=A1": "../resources/log.js?pipe=sub&name=C1",
    "../resources/log.js?pipe=sub&name=A3": "../resources/log.js?pipe=sub&name=C3"
  }
}
</script>
<script>
// Currently the spec doesn't allow multiple import maps, by setting acquiring
// import maps to false on preparing the first import map.
promise_test(() => {
  return import("../resources/log.js?pipe=sub&name=A1")
    .then(() => import("../resources/log.js?pipe=sub&name=A2"))
    .then(() => import("../resources/log.js?pipe=sub&name=A3"))
    .then(() => assert_array_equals(
                    log,
                    ["onerror 2", "log:B1", "log:B2", "log:A3"]))
  },
  "Second import map should be rejected");
</script>