The sessionStorage object allows programmers to save key/value pairs in a web browser, however data persists for only one session. Once the browser or browser tab closes, the data is lost. The simple existence of the sesssionStorage object is sufficient to use this object in a data print.
This is a rather simple way to determine is the sesssionStorage method exists. When calling !!window.sesssionStorage and error will indicate it exists, while no error will indicate it does not exist.
Entropy Estimate: 1.0 bits
The JavaScript function below fingerprints the timezone settings for the device.
Note: Depending on your output method you may need to URL encode the returned results.
function fp_sessionstorage() {
"use strict";
var strOnError, strOut;
strOnError = "<sessionstorage>true</sessionstorage>";
strOut = "";
try {
strOut = "<sessionstorage>" + !!window.sessionStorage + "</sessionstorage>";
return strOut;
} catch (err) { // Error when referencing it confirms existence
return strOnError;
}
}
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Window sessionStorage Property. Retrieved March 01, 2018, from https://www.w3schools.com/jsref/prop_win_sessionstorage.asp