How to change the Content of a textarea with Javascript?

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How to change the Content of a <textarea> with Javascript?
While writing an article on today, i cam to know that need to set one of the <textarea> control to blank/empty value during run time. So here is an option to perform this action using javascript,

document.getElementById('contentID').value = '';
Where you have
<textarea id="contentID" name="test">Text to be removed.</textarea>




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