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Truly independent web browser
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Andreas Kling afe6abfc09 LibWeb: Use an ancestor filter to quickly reject many CSS selectors 
Given a selector like `.foo .bar #baz`, we know that elements with
the class names `foo` and `bar` must be present in the ancestor chain of
the candidate element, or the selector cannot match.

By keeping track of the current ancestor chain during style computation,
and which strings are used in tag names and attribute names, we can do
a quick check before evaluating the selector itself, to see if all the
required ancestors are present.

The way this works:

1. CSS::Selector now has a cache of up to 8 strings that must be present
   in the ancestor chain of a matching element. Note that we actually
   store string *hashes*, not the strings themselves.

2. When Document performs a recursive style update, we now push and pop
   elements to the ancestor chain stack as they are entered and exited.

3. When entering/exiting an ancestor, StyleComputer collects all the
   relevant string hashes from that ancestor element and updates a
   counting bloom filter.

4. Before evaluating a selector, we first check if any of the hashes
   required by the selector are definitely missing from the ancestor
   filter. If so, it cannot be a match, and we reject it immediately.

5. Otherwise, we carry on and evaluate the selector as usual.

I originally tried doing this with a HashMap, but we ended up losing
a huge chunk of the time saved to HashMap instead. As it turns out,
a simple counting bloom filter is way better at handling this.
The cost is a flat 8KB per StyleComputer, and since it's a bloom filter,
false positives are a thing.

This is extremely efficient, and allows us to quickly reject the
majority of selectors on many huge websites.

Some example rejection rates:
- https://amazon.com: 77%
- https://github.com/SerenityOS/serenity: 61%
- https://nytimes.com: 57%
- https://store.steampowered.com: 55%
- https://en.wikipedia.org: 45%
- https://youtube.com: 32%
- https://shopify.com: 25%

This also yields a chunky 37% speedup on StyleBench. :^)
2024-03-22 18:27:32 +01:00
.devcontainer Meta: Switch to clang-format-16 as the standard formatter 2023-07-08 10:32:56 +01:00
.github Meta: Add Polar to FUNDING.yml 2024-02-21 07:36:55 +01:00
AK AK: Use else if constexpr in explode_byte() 2024-03-21 14:35:20 -06:00
Base Base: Add Emoji 2024-03-21 21:28:12 +00:00
Documentation Documentation: Update for the removal of SERENITY_SOURCE_DIR requirement 2024-02-26 13:16:27 -07:00
Kernel Kernel/riscv64: Fix typo (CSR::SATP::Mode::{Sv67 => Sv57}) 2024-03-20 10:36:10 -06:00
Ladybird AK+LibURL: Move AK::URL into a new URL library 2024-03-18 14:06:28 -04:00
Meta LibWeb: Ensure enumerated attributes are always limited to known values 2024-03-22 11:29:57 +01:00
Ports Ports: Update lite-xl to 2.1.3 2024-03-14 15:42:58 +01:00
Tests LibWeb: Do not include box's own scroll offset in get_client_rects() 2024-03-22 12:13:59 +01:00
Toolchain Kernel: Add initial basic support for KASAN 2023-12-30 13:57:10 +01:00
Userland LibWeb: Use an ancestor filter to quickly reject many CSS selectors 2024-03-22 18:27:32 +01:00
.clang-format Meta: Support using clang-format on Objective-C++ files 2023-08-22 21:36:19 -04:00
.clang-tidy Meta: Disable readability-function-cognitive-complexity in clang-tidy 2024-02-05 08:04:24 -07:00
.editorconfig Meta: Add .editorconfig 2022-09-10 17:32:55 +01:00
.gitattributes Repository: Protect port patches from CRLF/LF normalization 2022-01-12 01:08:38 +01:00
.gitignore Meta: Move .DS_Store rule to the bottom of the .gitignore file 2023-11-14 14:53:37 -05:00
.gn Meta: Automatically generate a compilation database for clangd 2023-11-14 14:29:35 -05:00
.mailmap Everywhere: Update copyrights with my new serenityos.org e-mail :^) 2023-07-15 16:21:29 +02:00
.pre-commit-config.yaml Meta: Add a post-commit commit message linter hook 2021-05-02 16:28:01 +02:00
.prettierignore LibJS: Add DisposableStack{, Prototype, Constructor} 2023-01-23 09:56:50 +00:00
.prettierrc
.ycm_extra_conf.py Meta: Remove i686 references in YCM configuration 2022-12-28 11:53:41 +01:00
azure-pipelines.yml CI: Remove extraneous toolchain job from Azure CI 2022-12-28 15:26:12 -05:00
CMakeLists.txt Meta: Replace run.sh by run.py 2023-12-15 00:11:50 +01:00
CONTRIBUTING.md Meta: Add a note about resolving PR review comments 2023-10-18 13:32:13 +02:00
LICENSE Meta: Update the year range in LICENSE 2024-01-06 17:39:16 -05:00
README.md Meta: Add implicitfield to the contributors list :^) 2024-02-26 13:51:40 -07:00
SECURITY.md Meta: Add a security policy 2022-06-29 03:29:27 +00:00

README.md

SerenityOS

Graphical Unix-like operating system for x86-64 computers.

GitHub Actions Status Azure DevOps Status Fuzzing Status Sonar Cube Static Analysis Discord

FAQ | Documentation | Build Instructions

About

SerenityOS is a love letter to '90s user interfaces with a custom Unix-like core. It flatters with sincerity by stealing beautiful ideas from various other systems.

Roughly speaking, the goal is a marriage between the aesthetic of late-1990s productivity software and the power-user accessibility of late-2000s *nix. This is a system by us, for us, based on the things we like.

You can watch videos of the system being developed on YouTube:

Screenshot

Screenshot as of c03b788.png

Features

  • Modern x86 64-bit kernel with pre-emptive multi-threading
  • Browser with JavaScript, WebAssembly, and more (check the spec compliance for JS, CSS, and Wasm)
  • Security features (hardware protections, limited userland capabilities, W^X memory, pledge & unveil, (K)ASLR, OOM-resistance, web-content isolation, state-of-the-art TLS algorithms, ...)
  • System services (WindowServer, LoginServer, AudioServer, WebServer, RequestServer, CrashServer, ...) and modern IPC
  • Good POSIX compatibility (LibC, Shell, syscalls, signals, pseudoterminals, filesystem notifications, standard Unix utilities, ...)
  • POSIX-like virtual file systems (/proc, /dev, /sys, /tmp, ...) and ext2 file system
  • Network stack and applications with support for IPv4, TCP, UDP; DNS, HTTP, Gemini, IMAP, NTP
  • Profiling, debugging and other development tools (Kernel-supported profiling, CrashReporter, interactive GUI playground, HexEditor, HackStudio IDE for C++ and more)
  • Libraries for everything from cryptography to OpenGL, audio, JavaScript, GUI, playing chess, ...
  • Support for many common and uncommon file formats (PNG, JPEG, GIF, MP3, WAV, FLAC, ZIP, TAR, PDF, QOI, Gemini, ...)
  • Unified style and design philosophy, flexible theming system, custom (bitmap and vector) fonts
  • Games (Solitaire, Minesweeper, 2048, chess, Conway's Game of Life, ...) and demos (CatDog, Starfield, Eyes, mandelbrot set, WidgetGallery, ...)
  • Every-day GUI programs and utilities (Spreadsheet with JavaScript, TextEditor, Terminal, PixelPaint, various multimedia viewers and players, Mail, Assistant, Calculator, ...)

... and all of the above are right in this repository, no extra dependencies, built from-scratch by us :^)

Additionally, there are over three hundred ports of popular open-source software, including games, compilers, Unix tools, multimedia apps and more.

How do I read the documentation?

Man pages are available online at man.serenityos.org. These pages are generated from the Markdown source files in Base/usr/share/man and updated automatically.

When running SerenityOS you can use man for the terminal interface, or help for the GUI.

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

How do I build and run this?

See the SerenityOS build instructions. Serenity runs on Linux, macOS (aarch64 might be a challenge), Windows (with WSL2) and many other *Nixes with hardware or software virtualization.

Get in touch and participate!

Join our Discord server: SerenityOS Discord

Before opening an issue, please see the issue policy.

A general guide for contributing can be found in CONTRIBUTING.md.

Authors

And many more! See here for a full contributor list. The people listed above have landed more than 100 commits in the project. :^)

License

SerenityOS is licensed under a 2-clause BSD license.