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    copied!<p>You cannot and you must not for security reasons (as Pekka already pointed out). You will always require a user interaction in between. Additionally imagine the chance of the browser vendors getting sued by users, as various programmatic keyboard events will have led to spoofing attacks.</p> <p>See this <a href="http://goo.gl/ghyhA0" rel="nofollow noreferrer">post</a> for alternatives and more details. There is always the flash based copy-and-paste. Here is an elegant <a href="http://www.colorzilla.com/gradient-editor/" rel="nofollow noreferrer">example</a>. At the same time it is a testimony why the web is moving away from plugin vendors.</p> <p>There is a similar security mindset applied in case of the <a href="http://goo.gl/JiYNEE" rel="nofollow noreferrer">opt-in CORS policy</a> to access remote content programmatically.</p> <p>The answer is:<br> <strong>There is no way to programmatically trigger input keys in the sandboxed browser environment under normal circumstances</strong>. </p> <p><strong>Bottomline:</strong> I am not saying it will not be possible in the future, under special browser-modes and/or privileges towards the end-goal of gaming, or similar user-experiences. However prior to entering such modes, the user will be asked for permissions and risks, similar to the <a href="https://www.google.at/search?client=opera&amp;q=w3c%20fullscreen%20api%20permission" rel="nofollow noreferrer">Fullscreen API model</a>. ( I included a google search link, as it neatly includes the relevant text lines in search-result)</p> <p><img src="https://i.stack.imgur.com/LvKAU.png" alt="enter image description here"></p>
 

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