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Test Info:

["localStorage", "sessionStorage"].forEach(function(name) {
test(function() {
var storage = window[name];
storage.clear();
assert_false("name" in storage);
storage["name"] = "user1";
assert_true("name" in storage);
}, "The in operator in " + name + ": property access");
test(function() {
var storage = window[name];
storage.clear();
assert_false("name" in storage);
storage.setItem("name", "user1");
assert_true("name" in storage);
assert_equals(storage.name, "user1");
storage.removeItem("name");
assert_false("name" in storage);
}, "The in operator in " + name + ": method access");
});