In addition to the existing "current aligned" & "usage relative" modes, caniuse now has a "date relative" mode for support data.
This mode, toggled via the button above the support table, organizes the support data relative to when each browser version was released. As a result, you can get an idea how support for a feature changed over time.
The tooltip information seen when hovering over versions now also includes the browser's release date, which appears in all three visualization modes.