Usually, in A/B Testing you will test variants of a certain page or post. However, it’s also possible to test other elements (such as themes, CSS styles, products, templates or post titles).
If we focus on the first type of test, an A/B test of post or pages, the original page or post is the WordPress page or post from your site that you want to improve. To do so, you create variant of that page or post so that you end up with one or more variant to put under test.

Notice. You can select the original page or post to test by selecting it in the drop down selector when editing a test. If the page or post doesn’t show up, you can look for it using its title, URL or ID.