[Webkit-unassigned] [Bug 205768] New: Resource Timing: secureConnectionStart == 0 when origin resource is requested from is reconnected to via Resource Hint

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205768

            Bug ID: 205768
           Summary: Resource Timing: secureConnectionStart == 0 when
                    origin resource is requested from is reconnected to
                    via Resource Hint
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ad at andydavies.net

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.

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