329452 2026-10-29 12:43:55 -0700 [WebDriver BiDi] input.performActions: avoid waiting for a presentation update to get a cross-process iframe's viewport 2026-10-29 12:44:03 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 326378 281949 1 rcaliman webkit-unassigned webkit-bug-importer oldest_to_newest 2271426 0 rcaliman 2026-10-29 12:43:55 -0700 For a frame whose root frame isn't the main frame (site isolation), WebAutomationSession::runBidiInteractionSequence waits for callAfterNextPresentationUpdate before asking the frame's process for its viewport. If that callback is postponed while the window is occluded, minimized or hidden, performActions never replies and blocks the context's input queue. Investigate: - whether the callback is guaranteed to run in those states; - whether WebPageProxy::convertPointToMainFrameCoordinates can provide the frame origin without the extra message or the wait. Classic Switch To Frame could reuse the same approach. Reported in review of https://github.com/WebKit/WebKit/pull/75927. 2271427 1 webkit-bug-importer 2026-10-29 12:44:03 -0700 <rdar://problem/191327860>