How to use localstorage in iframe?

@raphael_tillman 

To use localStorage within an iframe, you can follow the steps below:

1. Access the parent window object in the iframe:

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const parentWindow = window.parent;

1. Use the localStorage property of the parent window to store and retrieve data:

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// To set data in localStorage
parentWindow.localStorage.setItem('key', 'value');

// To get data from localStorage
const data = parentWindow.localStorage.getItem('key');

1. Make sure to handle errors and check for browser support for localStorage:

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// Checking for browser support
if (parentWindow.localStorage) {
   // localStorage is supported
} else {
   // localStorage is not supported
}

By following these steps, you can easily access and use localStorage within an iframe to store and retrieve data.