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The lexbor project is being developed using the C language, without dependencies.


  • Modules.
  • Single or separate libraries for each module.
  • No outside dependencies.
  • Easy to port to any platform.
  • C99 support.
  • Speed.

HTML Module

CSS Module

Supported CSS Properties for StyleSheet/Declarations:

align-content, align-items, align-self, alignment-baseline, background-color,
baseline-shift, baseline-source, border, border-bottom, border-bottom-color,
border-left, border-left-color, border-right, border-right-color, border-top,
border-top-color, bottom, box-sizing, clear, color, direction, display,
dominant-baseline, flex, flex-basis, flex-direction, flex-flow, flex-grow,
flex-shrink, flex-wrap, float, float-defer, float-offset, float-reference,
font-family, font-size, font-stretch, font-style, font-weight,
hanging-punctuation, height, hyphens, inset-block-end, inset-block-start,
inset-inline-end, inset-inline-start, justify-content, left, letter-spacing,
line-break, line-height, margin, margin-bottom, margin-left, margin-right,
margin-top, max-height, max-width, min-height, min-width, opacity, order,
overflow-block, overflow-inline, overflow-wrap, overflow-x, overflow-y,
padding, padding-bottom, padding-left, padding-right, padding-top, position,
right, tab-size, text-align, text-align-all, text-align-last, text-combine-upright,
text-decoration, text-decoration-color, text-decoration-line, text-decoration-style,
text-indent, text-justify, text-orientation, text-overflow, text-transform, top,
unicode-bidi, vertical-align, visibility, white-space, width, word-break,
word-spacing, word-wrap, wrap-flow, wrap-through, writing-mode, z-index

Properties that are unknown to the parser will be created as custom (lxb_css_property__custom_t). Support for new properties is added regularly.

Encoding Module

Build and Installation

Binary packages

Binaries are available for:

  • CentOS 6, 7, 8
  • Debian 8, 9, 10, 11
  • Fedora 28, 29, 30, 31, 32, 33, 34, 36, 37
  • RHEL 7, 8
  • Ubuntu 14.04, 16.04, 18.04, 18.10, 19.04, 19.10, 20.04, 20.10, 21.04, 22.04

Currently for x86_64 architecture. If you need any other architecture, please, write to



To install lexbor on macOS from Homebrew:

brew install lexbor


To install lexbor on macOS from MacPorts:

sudo port install lexbor

Source code

For building and installing Lexbor library from source code, use CMake (open-source, cross-platform build system).

make test

Please, see more information in documentation.

Single or separately


  • liblexbor — this is a single library that includes all modules.


  • liblexbor-{module name} — libraries for each module.

You only need an HTML parser? Use liblexbor-html.

Separate modules may depend on each other. For example, dependencies for liblexbor-html: liblexbor-core, liblexbor-dom, liblexbor-tag, liblexbor-ns.

The liblexbor-html library already contains all the pointers to the required dependencies. Just include it in the assembly: gcc program.c -llexbor-html.

External Bindings and Wrappers

  • Elixir binding for the HTML module (since 2.0 version)
  • Crystal Fast HTML5 Parser with CSS selectors for Crystal language
  • Python binding for modest and lexbor engines.
  • D Fast HTML5 Parser with CSS selectors for D programming language
  • Ruby Fast HTML5 Parser with both CSS selectors and XPath support.

You can create a binding or wrapper for the lexbor and place the link here!


Available on in Documentation section.


Please, see roadmap on

Getting Help


Alexander Borisov



Copyright 2018-2023 Alexander Borisov

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Please, see LICENSE file.