Twitter will kick off internal testing on an edit function in the months ahead, the company said on Tuesday, adding that work on the button – its “most requested” feature by users – started last year before any online poll on it. The social media company also posted animation showing how the feature would work. Tesla Chief Executive Officer Elon Musk, who is Twitter’s biggest shareholder with a 9.1% active stake, started a Twitter poll on Monday asking users if they want an edit button.