10BC0 webdriver: Focus when "switch to window" by yezhizhen · Pull Request #38889 · servo/servo · GitHub
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Merged
merged 3 commits into from
Aug 24, 2025
Merged

webdriver: Focus when "switch to window" #38889

merged 3 commits into from
Aug 24, 2025

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yezhizhen
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@yezhizhen yezhizhen commented Aug 23, 2025 •
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Add logic that was accidentally removed in #38745. Otherwise it is very weird when using webdriver as a human, as we still stays on the original tab.

Testing: this should not affect any test. Even if the tab is not "visible" previously, all programmatic interaction works fine. Stably pass test_history_pushstate in back.py and forward.py.

@yezhizhen yezhizhen requested review from mrobinson and jdm August 23, 2025 15:57
@yezhizhen yezhizhen marked this pull request as draft August 23, 2025 16:59
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yezhizhen commented Aug 23, 2025 •
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Converting to draft as I see two stably passing tests due to this change.. I wanna know why.

EDIT: We are stably passing following test related to history navigation

servo/tests/wpt/tests/webdriver/tests/classic/back/back.py

Line 112 in 0a81461

assert session.url == "{}#pushstate".format(pushstate_page)

This involves ScriptToConstellationMessage::PushHistoryState.

servo/components/constellation/constellation.rs

Lines 1740 to 1741 in 0a81461

ScriptToConstellationMessage::PushHistoryState(history_state_id, url) => {
self.handle_push_history_state_msg(source_pipeline_id, history_state_id, url);

I suspect source_pipeline_id is wrong when we didn't focus the tab where interaction happens..

@yezhizhen yezhizhen marked this pull request as ready for review August 23, 2025 17:43
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yezhizhen commented Aug 24, 2025 •
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This is really interesting.

When we didn't focus the tab 2 (webview_id = TopLevel(0,2)), it seems the DocumentEventHandler receiving the input event is the visible one (TopLevel(0,1)).

servo/components/script/dom/document_event_handler.rs

Lines 65 to 67 in 1fc8578

pub(crate) struct DocumentEventHandler {
/// The [`Window`] element for this [`DocumentEventHandler`].
window: Dom<Window>,

The log says constellation indeed forward to the tab 2. However, the DocumentEventHandler handling it is for tab 1.

constellation.rs:2973:9] "Constellation forward for webview_id:" = "Constellation forward for webview_id:"
constellation.rs:2973:9] &webview_id = TopLevel(0,2)
script_thread] Handling event: FromConstellation(ConstellationControlMsg::SendInputEvent)
DEBUG script::dom::document_event_handler] TopLevel(0,1)

It is not related to this PR anyway.

@yezhizhen
focus when switch to window
0231ef2 
Signed-off-by: Euclid Ye <euclid.ye@huawei.com>
@yezhizhen
Update WPT
8257c14 
Signed-off-by: Euclid Ye <euclid.ye@huawei.com>
@yezhizhen
unstable sort window handles
eca814d 
Signed-off-by: Euclid Ye <euclid.ye@huawei.com>
@yezhizhen yezhizhen added this pull request to the merge queue Aug 24, 2025
Merged via the queue into servo:main with commit 0b5bcfb Aug 24, 2025
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@yezhizhen yezhizhen deleted the add-focus branch August 24, 2025 14:01
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yezhizhen commented Aug 25, 2025 •
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cc @PotatoCP @longvatrong111 After this, there are many flaky TIMEOUT due to focus race condition I said before. I've been working on it.

@longvatrong111 longvatrong111 mentioned this pull request Aug 25, 2025
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@yezhizhen yezhizhen mentioned this pull request Aug 25, 2025
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@yezhizhen yezhizhen mentioned this pull request Sep 2, 2025
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github-merge-queue bot pushed a commit that referenced this pull request Sep 2, 2025
@yezhizhen
webdriver: Focus browsing context when switch frame (#39086)
8143
802fdd9 
#38889 adds back the mechanism to focus the window when [switch to
window](https://w3c.github.io/webdriver/#switch-to-window). After that,
it causes many flaky TIMEOUT. Turns out the real reason is same as the
phenomenon which I thought was unrelated:
#38889 (comment): we
need to focus the browsing context as well according to spec. This is
important for Servo because it relies on
https://github.com/servo/servo/blob/f4dd2960b89bcc6bae3f9dae5be8964c64c1c2c7/components/constellation/constellation_webview.rs#L64
to determine which pipeline to send `InputEvent` to.

Testing: Before, there are 9 ~ 13 flaky results. [Before
1](https://github.com/yezhizhen/servo/actions/runs/17379170889), [Before
2](https://github.com/yezhizhen/servo/actions/runs/17392219417), [Before
3](https://github.com/yezhizhen/servo/actions/runs/17379172612).
Now there are 2 ~ 4 flaky results. [After
1](https://github.com/yezhizhen/servo/actions/runs/17394359570), [After
2](https://github.com/yezhizhen/servo/actions/runs/17394358218), [After
3](https://github.com/yezhizhen/servo/actions/runs/17394357400).
Fixes: #38889 (comment)
Fixes: #38906, which is last blocking point to enable WebDriver CI.

---------

Signed-off-by: Euclid Ye <euclid.ye@huawei.com>
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@mrobinson mrobinson mrobinson approved these changes

@jdm jdm Awaiting requested review from jdm

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