Scrub the session, then switch replay modes to see what DOM reconstruction loses.
example.com/checkout
Example StoreSign in
Email
Password
Sign in
Payment widget · third-party frame
Card number
4242 4242 4242 4242
Pay
Usage chart · canvas
Step 1 of 5: Page load. Video replay: rendered faithfully.
VideoSelected
CPUhigh
Storagehigh
DOM reconstruction
CPUlow
Storagelow
Illustrative, not measured