IPFS is immutable and hash addressed, so 'modifying' something yields a new address. Existing documents that point to the modified thing will still point to the

IPFS is immutable and hash addressed, so 'modifying' something yields a new address. Existing documents that point to the modified thing will still point to the old version, unless their links change as well. Effectively, sharing a hash address to the main page is sharing a snapshot of the site.