205768 2020-01-04 13:28:56 -0800 Resource Timing: secureConnectionStart == 0 when origin resource is requested from is reconnected to via Resource Hint 2023-10-04 17:41:04 -0700 1 1 1 Unclassified WebKit Page Loading Safari Technology Preview Mac macOS 10.14 RESOLVED DUPLICATE 225733 InRadar P2 Normal --- 1 ad webkit-unassigned achristensen ahmad.saleem792 beidson cdumez webkit-bug-importer youennf oldest_to_newest 1602779 0 ad 2020-01-04 13:28:56 -0800 Example Test Case: https://andydavies.github.io/browser-bug-demos/secureConnectionStart/preconnect.html Page preconnects to res.cloudinary.com, after a short delay (to allow for a connection to be established) sets image URL, then when image loads, queries resource timing entries and inserts them into the page. DNS and TCP phases of connection are clamped to fetchStart as they occurred before it) secureConnectionStart is zero rather than being clamped in the same way Chrome has similar behaviour (https://bugs.chromium.org/p/chromium/issues/detail?id=1039080) but the behaviour seems to change depending on whether DevTools is open, Safari's behaviour remains consistent regardless of whether Inspector is open or closed. 1602930 1 webkit-bug-importer 2020-01-05 19:57:05 -0800 <rdar://problem/58331361> 1980345 2 ahmad.saleem792 2023-09-26 17:12:38 -0700 I believe this is similar to what was fixed here: https://commits.webkit.org/237727@main CCing - Alex and Chris for their input. 1982659 3 achristensen 2023-10-04 17:41:04 -0700 Yep. Thanks, Ahmad! *** This bug has been marked as a duplicate of bug 225733 ***