---
title: "Changelog"
url: https://recursiveai.org/onehtml/docs/changelog/
description: "All notable changes are listed here. The format follows Keep a Changelog and versions follow Semantic Versioning."
version: "1.0.0"
source: https://github.com/recursive-ai-oss/onehtml-csharp/blob/cecf589eb9acfc9e1fbc529486dfef519a32c19c/CHANGELOG.md
---

# Changelog

All notable changes are listed here. The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and versions follow [Semantic Versioning](https://semver.org/).

## [Unreleased]

## [1.0.0] - 2026-10-26

First release. All three packages share one version.

### Added

- `RecursiveAI.OneHtml`: the WHATWG HTML parser (encoding sniffing, tokenizer, every insertion mode, foreign content, templates, fragment parsing), passing the html5lib tokenizer and tree-construction tests; the DOM as immutable arena snapshots with a byte-level source map; Selectors Level 4 and unique locator generation; CSS Syntax Level 3 parsing of `<style>`, `style=""` and caller-supplied stylesheets; the cascade for every known property, with typed computed values for the accessibility-relevant set, under a `StyleContext` (viewport, media features, focus, hover, target, active) with incremental restyle; lossless editing of HTML, inline styles, `<style>` and linked stylesheets, where untouched bytes stay identical and every result is re-parsed and verified; and a versioned JSON edit format with replay that resolves, goes stale or reports ambiguity, but never picks the wrong element. See `docs/edit-format.md`.
- `RecursiveAI.OneHtml.Accessibility`: the accessibility tree (WAI-ARIA 1.2, HTML-AAM, AccName 1.2, Core-AAM, SVG-AAM) with each role, name and hidden state traced to its source, Chromium's choices listed in `docs/accessibility-chromium-profile.md`, incremental recompute after edits, a reading view, navigation lists, tree and reading-view diffs, an export in Chrome's AX-tree shape, and `RenderedFacts` from a Chrome `DOMSnapshot` supplied by the caller.
- `RecursiveAI.OneHtml.Accessibility.Validation`: one rule catalogue covering axe-core's WCAG and best-practice rules (the two with no counterpart are explained in `docs/axe-differential.md`) and every W3C-approved ACT rule, labelled by WCAG version, level and criterion; profiles for WCAG 2.0 AA, 2.1 AA, 2.2 AA and everything; contrast that never guesses a background; incremental re-check after an edit; suggested edits for the rules that have exactly one correct fix; native JSON, axe-compatible JSON and SARIF 2.1.0 output. Coverage per criterion is in `docs/coverage.md`.

[1.0.0]: https://github.com/recursive-ai-oss/onehtml-csharp/releases/tag/v1.0.0