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chromium/third_party/blink/web_tests/http/tests/security/isolatedWorld/storage-properties.html 

<!DOCTYPE html>
<html>
<body>
<div id="console"></div>
<script>
localStorage.clear();
localStorage.foo = "Visible";
sessionStorage.clear();
sessionStorage.foo = "Visible";
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.evaluateScriptInIsolatedWorld(
    1,
    "document.getElementById('console').innerHTML = localStorage.foo + ' and ' + sessionStorage.foo");
}
localStorage.clear();
sessionStorage.clear();
</script>
</body>
</html>