Bug 275702 – window.location.replace does not emit page lifecycle events on iOS

• Component: Page Loading
• Status: NEW

Created attachment 471715 [details]
page lifecycle events test

Summary:
- Navigation via window.location.replace seems to not emit any page lifecycle events (pagehide, unload, visibilitychange) on iOS Safari
- This behavior seems inconsistent with MacOS Safari and other browsers, and other navigation methods (window.location.assign, window.location.reload, window.location.href=, clicking links).

Steps to reproduce:
- Open attached test html in a new tab on iOS Safari.
- Click the window.location.replace button.
- Close tab (don't use the back button).
- Open this page again in a new tab.
- Check the event table to see the events emitted from the previous page load.

Expected:
- There should be a pagehide event after the window.location.replace.
- There should be a visibilitychange event after the window.location.replace, and document.visibilityState === "hidden".
- There should be a unload event after the window.location.replace.

Observed:
- There is no pagehide event after the window.location.replace.
- There is no visibilitychange event after the window.location.replace, and no change to document.visiblityState.
- There is no unload event after the window.location.replace.

Further Notes:
- Testing the same behavior in Safari (Desktop) emits pagehide+visibilitychange+unload.
- Testing the same behavior in Chrome (Desktop & Mobile) emits beforeunload+pagehide+visibilitychange+unload.
- Testing the same behavior in Firefox (Desktop) triggers beforeunload+pagehide+visibilitychange+blur+unload.
- Testing other navigation methods in Safari (iPhone) (window.location.assign, window.location.reload, window.location.href=, clicking links) emits pagehide+visibilitychange+unload.

[Radar WebKit Bug Importer]

<rdar://problem/130238744>

[Karl Dubost]

macOS Safari STP 176

Page Load	Page Event Sequence	Type	Visibility State	Date
2 (current)	5	event: blur	visible	2024-06-24T08:01:47.979Z
2 (current)	4	event: focus	visible	2024-06-24T08:01:26.965Z
2 (current)	3	event: focus	visible	2024-06-24T08:01:26.964Z
2 (current)	2	event: pageshow	visible	2024-06-24T08:01:26.909Z
2 (current)	1	event: load	visible	2024-06-24T08:01:26.909Z
1 (previous)	8	event: unload	hidden	2024-06-24T08:01:14.209Z
1 (previous)	7	event: visibilitychange	hidden	2024-06-24T08:01:14.208Z
1 (previous)	6	event: pagehide	visible	2024-06-24T08:01:14.208Z
1 (previous)	5	triggered: window.location.replace	visible	2024-06-24T08:01:13.882Z
1 (previous)	4	event: focus	visible	2024-06-24T08:01:11.055Z
1 (previous)	3	event: focus	visible	2024-06-24T08:01:11.055Z
1 (previous)	2	event: pageshow	visible	2024-06-24T08:01:10.985Z
1 (previous)	1	event: load	visible	2024-06-24T08:01:10.984Z


macOS Firefox Nightly 129.0a1 (2024-06-23) (64-bit)

Page Load	Page Event Sequence	Type	Visibility State	Date
2 (current)	5	event: focus	visible	2024-06-24T08:06:27.442Z
2 (current)	4	event: blur	visible	2024-06-24T08:03:59.339Z
2 (current)	3	event: focus	visible	2024-06-24T08:03:24.931Z
2 (current)	2	event: pageshow	visible	2024-06-24T08:03:24.929Z
2 (current)	1	event: load	visible	2024-06-24T08:03:24.928Z
1 (previous)	9	event: unload	hidden	2024-06-24T08:03:14.588Z
1 (previous)	8	event: blur	hidden	2024-06-24T08:03:14.588Z
1 (previous)	7	event: visibilitychange	hidden	2024-06-24T08:03:14.579Z
1 (previous)	5	event: beforeunload	visible	2024-06-24T08:03:14.389Z
1 (previous)	4	triggered: window.location.replace	visible	2024-06-24T08:03:14.388Z
1 (previous)	3	event: focus	visible	2024-06-24T08:03:11.812Z
1 (previous)	2	event: pageshow	visible	2024-06-24T08:03:11.811Z
1 (previous)	1	event: load	visible	2024-06-24T08:03:11.811Z



macOS Chrome Canary Version 128.0.6548.0 (Official Build) canary (arm64)

Page Load	Page Event Sequence	Type	Visibility State	Date
2 (current)	8	event: focus	visible	2024-06-24T08:05:27.084Z
2 (current)	7	event: visibilitychange	visible	2024-06-24T08:05:27.082Z
2 (current)	6	event: visibilitychange	hidden	2024-06-24T08:05:13.388Z
2 (current)	5	event: blur	visible	2024-06-24T08:05:13.386Z
2 (current)	4	event: focus	visible	2024-06-24T08:05:10.371Z
2 (current)	3	event: blur	visible	2024-06-24T08:02:41.585Z
2 (current)	2	event: pageshow	visible	2024-06-24T08:02:14.373Z
2 (current)	1	event: load	visible	2024-06-24T08:02:14.373Z
1 (previous)	7	event: unload	hidden	2024-06-24T08:02:09.141Z
1 (previous)	6	event: visibilitychange	hidden	2024-06-24T08:02:09.141Z
1 (previous)	5	event: pagehide	visible	2024-06-24T08:02:09.140Z
1 (previous)	4	event: beforeunload	visible	2024-06-24T08:02:08.671Z
1 (previous)	3	triggered: window.location.replace	visible	2024-06-24T08:02:08.670Z
1 (previous)	2	event: pageshow	visible	2024-06-24T08:02:05.296Z
1 (previous)	1	event: load	visible	2024-06-24T08:02:05.295Z



iOS Safari 18

Page Load	Page Event Sequence	Type	Visibility State	Date
2 (current)	6	event: focus	visible	2024-06-24T08:09:29.836Z
2 (current)	5	event: blur	visible	2024-06-24T08:09:19.573Z
2 (current)	4	event: focus	visible	2024-06-24T08:09:19.558Z
2 (current)	3	event: focus	visible	2024-06-24T08:09:19.558Z
2 (current)	2	event: pageshow	visible	2024-06-24T08:09:19.553Z
2 (current)	1	event: load	visible	2024-06-24T08:09:19.553Z
1 (previous)	5	triggered: window.location.replace	visible	2024-06-24T08:08:14.919Z
1 (previous)	4	event: focus	visible	2024-06-24T08:08:04.975Z
1 (previous)	3	event: focus	visible	2024-06-24T08:08:04.975Z
1 (previous)	2	event: pageshow	visible	2024-06-24T08:08:04.959Z
1 (previous)	1	event: load	visible	2024-06-24T08:08:04.959Z


Android 14 Firefox Nightly 128.0a1
Page Load    Page  Event Sequence          Type Visibility State Date
2 (current)  3     event: pageshow         visible       2024-06-24T08:14:48.034Z
2 (current)  2     event: load             visible       2024-06-24T08:14:48.031Z
2 (current)  1     event: focus            visible       2024-06-24T08:14:48.020Z
1 (previous) 7     event: visibilitychange hidden        2024-06-24T08:14:32.916Z
1 (previous) 6     event: pagehide         visible       2024-06-24T08:14:32.914Z
1 (previous) 5     event: beforeunload     visible       2024-06-24T08:14:32.696Z
1 (previous) 4     triggered: window.location.replace visible 2024-06-24T08:14:32.691Z
1 (previous) 3     event: pageshow         visible       2024-06-24T08:14:30.113Z
1 (previous) 2     event: load             visible       2024-06-24T08:14:30.111Z
1 (previous) 1     event: focus            visible       2024-06-24T08:14:30.095Z

[Karl Dubost]

To make it more visible and putting them on a horizontal scale.

Event Start = window.location.replace

```
macOS    STP 176   start → pagehide............... → visibilitychange ...... → unload → load → pageshow ...... → focus
macOS    Ffx 129   start → beforeunload........... → visibilitychange → blur → unload → load → pageshow ...... → focus 
macOS    Chr 128   start → beforeunload → pagehide → visibilitychange ...... → unload → load → pageshow → blur → focus 
iOS      Sfr 18    start ............................................................ → load → pageshow ...... → focus 
Android  Ffx 128   start → beforeunload → pagehide → visibilitychange ...... → unload → load → pageshow → blur → focus 
```