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Player: compare two traces side by side #502
Description
Part of #494.
Proposal
Open two traces side by side, typically a passing run and a failing run of the same test, and line up their actions, network, console and DOM so the first divergence is visible.
The live dashboard already has a Compare tab for a preserved attempt against its rerun; this brings the same idea to recorded traces. No other trace player offers it.
Activity
vishnuv688 commentedon Nov 6, 2026
Parked for now. A first version was built and tested locally (two traces aligned by action, a first-difference jump, console and network differences), but it is a large change for a narrow use case: comparing a CI trace with a local one, or two nightlies, which two player tabs side by side already mostly cover. It is not being opened as a PR; revisit if users ask for it.