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Showing content from https://webplatform.github.io/docs/apis/web-storage/Storage/sessionStorage below:

sessionStorage · WebPlatform Docs

Provides a Storage object specific to the current top-level browsing context. The storage will be cleared after a browser restart. If you need a persistent storage, use apis/web-storage/Storage/localStorage.

Property of apis/web-storage/Storageapis/web-storage/Storage

Note: This property is read-only.

var result = object.sessionStorage;

Returns an object of type ObjectObject

var valueSetHandler = function () {
    
    var key = document.getElementById('key').value,
        value = document.getElementById('value').value;

    
    window.sessionStorage.setItem(key, value);
},
valueGetHandler = function () {
    
    var key = document.getElementById('get-key').value,

        
        value = window.sessionStorage.getItem(key);

    
    document.getElementById('output').innerText = value;
},
clearStorageHandler = function () {
    window.sessionStorage.clear();
};


document.getElementById('set-local').addEventListener('click', valueSetHandler);
document.getElementById('get-local').addEventListener('click', valueGetHandler);
document.getElementById('clear').addEventListener('click', clearStorageHandler);

View live example

<section>
    <label for="key">Key:</label>
    <input type="text" id="key" value="c3po">
    <br>
    <label for="value">Value:</label>
    <input type="text" id="value" value="R2-D2">
    <br>
    <button type="button" id="set-local">Save to sessionStorage</button>
</section>
<hr>
<section>
    <label for="get-key">Key:</label>
    <input type="text" id="get-key" value="c3po">
    <button type="button" id="get-local">Get from sessionStorage</button>
    <output id="output"></output>
</section>
<hr>
<section>
    <button type="button" id="clear">Clear sessionStorage</button>
</section>

 Use the methods setItem, getItem, removeItem and clear defined in apis/web-storage/Storage

The sessionStorage “property” provides an instance of a storage area object, to which the Storage object’s properties and methods are applied.

The amount of storage in sessionStorage is limited by a quota by the browser. See an example error for when the quota is exceed: http://jsfiddle.net/wkDc6/1/

W3C Web Storage Specification

W3C Editor’s Draft

• Microsoft Developer Network: Windows Internet Explorer API reference Article

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