<html> <head> <script> if (window.testRunner) testRunner.dumpAsText(); function log(a) { document.getElementById("logger").innerHTML += a + "<br>"; } function testStorage(name, storage) { if ("length" in storage) log("Storage object " + name + " has length"); if ("key" in storage) log("Storage object " + name + " has key"); if ("getItem" in storage) log("Storage object " + name + " has getItem"); if ("setItem" in storage) log("Storage object " + name + " has setItem"); if ("removeItem" in storage) log("Storage object " + name + " has removeItem"); if ("clear" in storage) log("Storage object " + name + " has clear"); } function runTest() { if ("sessionStorage" in window) { log("window.sessionStorage exists"); testStorage("sessionStorage", window.sessionStorage); log("window.sessionStorage == window.sessionStorage: " + (window.sessionStorage == window.sessionStorage)); log("window.sessionStorage === window.sessionStorage: " + (window.sessionStorage === window.sessionStorage)); } else log("window.sessionStorage DOES NOT exist"); if ("localStorage" in window) { log("window.localStorage exists"); testStorage("localStorage", window.localStorage); log("window.localStorage == window.localStorage: " + (window.localStorage == window.localStorage)); log("window.localStorage === window.localStorage: " + (window.localStorage === window.localStorage)); } else log("window.localStorage DOES NOT exist"); if ("onstorage" in window) log("window.onstorage exists"); else log("window.onstorage DOES NOT exist"); } </script> </head> <body onload="runTest();"> This test checks to see if window.localStorage, window.sessionStorage and window.onstorage exist.<br> <div id="logger"></div> </body> </html>