How to perform this trick?
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Open any website of your choice (like facebook) in browser (internet
explorer,google chrome,firefox) and clear the address bar of the
browser.
Copy paste the following javascript code in the address bar of your browser
javascript:document.body.contentEditable='true'; document.designMode='on'; void 0
And thats it.Now you can edit anything that is written on the page.
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Update:-The java script code doesn’t work in the latest version of Google Chrome Browser