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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
storageTestItem = <span id="storageTestItem">FAIL</span>
<!--
  storageTestItem's textContent will be one of the following:
  * FAIL    : sessionStorage wasn't available
  * PENDING : the test value has been initialized on first load
  * SUCCESS : the test value was correctly retrieved
-->
<script>
  document.getElementById("storageTestItem").textContent =
    sessionStorage["storageTestItem"] || "PENDING";
  sessionStorage["storageTestItem"] = "SUCCESS";
</script>