The actions below are usually perceived as a new page by users. And thus clicking the Back button should go back to the previous state.
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Opening an overlay & lightbox (the back button should close it)
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Filtering & sorting (the back button should go back to the previous filtering or sorting values)
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Going to the next step in an accordion checkout or a multi-step process on a page (such as a multi-step shipping estimator on the product page)
- AJAX pagination (Back button goes back to the previous page)
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Returning to the product list from the product page
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Expanding or truncating content (especially if the expanded content takes most of the screen)
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Clicking an anchor link (if they’re abruptly jumped down the page)
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Variations on the product page (depending on how many variations there are on average)