They re-inscribe the page as a new Ordinal and re-point that page's address to the new inscription. Links between the pages keep working, so a single page can be refreshed without rebuilding the whole site. Nothing is overwritten — the previous…
Web3 Sites
Web3 Sites are complete websites whose pages have each been permanently inscribed onto the BSV blockchain, and which BSV Search displays under a short address such as bsvsearch.com/earthlog.web3. This section explains what they are and how they work.