demo · v132
Where does firstResponseHeadersStart land?
Run a real fetch. The page reads the resulting PerformanceResourceTiming entry and surfaces every milestone — including the new v132 one — in a side-by-side axis and table.
checking support…
timing axis
fetch first to see milestones
fields
| field | value (ms) | describes |
|---|---|---|
| click "fetch & analyse" | ||