Explain me this: function autoResize(textarea) { textarea.style.height = 'auto'; textarea.style.height = (textarea.scrollHeight + 2) + 'px'; // 2px extra for padding }

This JavaScript function, autoResize, is designed to automatically adjust the height of a textarea element based on its content. When called, it sets the textarea's height to 'auto', allowing it to expand or shrink based on the content. Then, it sets the height to the scrollHeight of the textarea plus 2 pixels for padding, ensuring that all content is visible without the need for manual resizing.