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sideshowbarker e918a448e4 LibWeb: Re-defer a navigation taken over by a traversal mid-flight
Problem: A navigation could intermittently hang forever with no load
event ever firing. In test-web, that surfaced as a 120-second
“pre-navigation timeout, WebContent process may be unresponsive”: The
about:blank load used for clearing the document between tests would
never complete — leaving WebContent idle while the harness waited.

Cause: begin_navigation claims the navigable’s ongoing navigation id and
then awaits an asynchronous unload check. While it waits, a session-
history traversal can re-stamp the navigable’s ongoing navigation to
“traversal”. When the unload check resumes, the navigation finds that
its ongoing navigation ID no longer matches — and silently aborts. But
nothing ever re-runs it — so the navigation is lost. The deferral guard
at the top of begin_navigation, which defers a navigation while a
traversal is already ongoing, runs before this window — so a traversal
that begins during the unload check slips past it.

Fix: When the post-unload-check guard finds the navigable is now running
a traversal, re-defer the navigation into the pending navigations list
instead of dropping it — mirroring the existing deferral guard. Clearing
the ongoing traversal drains the pending navigations — so the navigation
runs to completion as a fresh attempt once the traversal finishes.

Fixes https://github.com/LadybirdBrowser/ladybird/issues/10122.
2026-06-16 11:43:09 +02:00
.devcontainer Documentation: List ncurses as a build dependency 2026-06-07 12:05:42 +12:00
.github CI: Switch macOS runners to macos-26 2026-06-16 09:44:38 +02:00
AK LibJS: Remove JS_BYTECODE_DEBUG 2026-06-14 20:27:59 +02:00
Base/res LibWebView: Elide overflowed title text on about:history 2026-06-11 09:18:17 -04:00
Documentation AK: Remove SANITIZE_PTRS support 2026-06-13 22:49:15 +02:00
Libraries LibWeb: Re-defer a navigation taken over by a traversal mid-flight 2026-06-16 11:43:09 +02:00
Meta Meta: Force vcpkg system binaries on arm64 Linux as well as riscv64 2026-06-16 10:53:21 +02:00
Services Compositor: Keep pinch zoom transforms in sync 2026-06-16 02:03:59 +02:00
Tests LibWeb: Re-defer a navigation taken over by a traversal mid-flight 2026-06-16 11:43:09 +02:00
UI LibWebView: Keep browser history in the UI process 2026-06-14 17:38:44 +02:00
Utilities LibGfx: Split image decoders into a separate library 2026-06-10 11:55:48 +02:00
.clang-format Meta: Enforce newlines around namespaces 2025-05-14 02:01:59 -06:00
.clang-tidy Meta: Disable clang-tidy's const correctness checks 2025-07-08 11:04:15 -04:00
.clangd Meta: Enable angled brackets in clangd 2026-03-20 19:32:14 +01:00
.editorconfig Meta: Add .editorconfig 2022-09-10 17:32:55 +01:00
.gdbinit Meta: Restore serenity_gdb.py 2026-05-28 14:33:25 +01:00
.gitattributes LibGfx: Remove support for the various "portable" image formats 2024-06-17 21:57:35 +02:00
.gitignore Meta: Ignore log files 2026-04-23 13:50:01 -04:00
.lldbinit Meta: Add lldb pretty printers for AK types 2026-05-28 11:55:24 +01:00
.mailmap Meta: Update my e-mail address everywhere 2024-10-04 13:19:50 +02:00
.pre-commit-config.yaml Meta: Replace deprecated pre-commit stage name 2024-10-18 09:40:59 +02:00
.prettierignore Tests: Exclude JS AST and bytecode tests from prettier checks 2026-02-19 02:45:37 +01:00
.prettierrc Meta: Increase the line length enforced by prettier to 120 2025-10-31 19:55:50 -04:00
.ycm_extra_conf.py Meta: Sort all python imports 2025-06-09 11:25:14 -04:00
Cargo.lock LibURL: Implement URLPattern in Rust 2026-05-28 09:27:41 +02:00
Cargo.toml LibURL: Implement a URL parser in rust 2026-05-28 09:27:41 +02:00
CMakeLists.txt Meta: Hoist the Fuzzers directory up one level 2026-06-13 10:30:02 -04:00
CMakePresets.json CMake+CI: Use the same preset names on every platform 2026-01-17 12:18:46 -07:00
CODE_OF_CONDUCT.md Meta: Add code of conduct (from the Ruby community) 2024-10-02 09:49:52 +02:00
CONTRIBUTING.md Everywhere: Update contribution guidelines 2026-06-05 10:20:15 +02:00
ISSUES.md Everywhere: Document use of ladybird.py over ladybird.sh 2025-05-29 16:24:17 -04:00
LICENSE Meta: Update LICENSE copyright year 2026-06-07 21:11:24 +02:00
pyproject.toml Tests/LibWeb: Run imported WPT handlers in HTTP test server 2026-06-06 13:48:43 +02:00
README.md Everywhere: Update contribution guidelines 2026-06-05 10:20:15 +02:00
rust-toolchain.toml Meta: Revert to a stable rust compiler 2026-06-02 20:12:41 +02:00
rustfmt.toml Meta: Revert to a stable rust compiler 2026-06-02 20:12:41 +02:00
SECURITY.md Documentation: Make updates to align better with new issue template 2024-10-31 09:18:08 +01:00
vcpkg-configuration.json Meta: Add overlay port for vulkan-loader 2024-07-07 15:56:59 +02:00
vcpkg.json Meta: Use Direct3D instead of Vulkan on Windows 2026-06-15 04:50:29 +02:00

Ladybird

Ladybird is a truly independent web browser, using a novel engine based on web standards.

Important

Ladybird is in a pre-alpha state, and only suitable for use by developers

Features

We aim to build a complete, usable browser for the modern web.

Ladybird uses a multi-process architecture with a main UI process, several WebContent renderer processes, an ImageDecoder process, and a RequestServer process.

Image decoding and network connections are done out of process to be more robust against malicious content. Each tab has its own renderer process, which is sandboxed from the rest of the system.

At the moment, many core library support components are inherited from SerenityOS:

  • LibWeb: Web rendering engine
  • LibJS: JavaScript engine
  • LibWasm: WebAssembly implementation
  • LibCrypto/LibTLS: Cryptography primitives and Transport Layer Security
  • LibHTTP: HTTP/1.1 client
  • LibGfx: 2D Graphics Library, Image Decoding and Rendering
  • LibUnicode: Unicode and locale support
  • LibMedia: Audio and video playback
  • LibCore: Event loop, OS abstraction layer
  • LibIPC: Inter-process communication

How do I build and run this?

See build instructions for information on how to build Ladybird.

Ladybird runs on Linux, macOS, Windows (with WSL2), and many other *Nixes.

How do I read the documentation?

Code-related documentation can be found in the documentation folder.

Get in touch and participate!

Join our Discord server to participate in issue and development discussions.

Please read Getting involved with Ladybird if you're new to Ladybird and want to help.

Before opening an issue, please see the issue policy and the detailed issue-reporting guidelines.

The project participation guidelines can be found in CONTRIBUTING.md.

License

Ladybird is licensed under a 2-clause BSD license.