This skill teaches you how to let your readers can jump back from the current page to their previously viewed pages.
Whether you really want to have a magical button, you can put it anywhere in your HTML document, so that your readers can jump from the current page to the previously viewed page? Perhaps, you are not like me so lazy, but I want to have this thought is not surprising. When browsing the page is very long, I hate to move the mouse to the "back" button of the browser.
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