Check Accessibility, HTML, CSS, Broken Links & Spelling
Application changes made in the last year
For all application changes in the last 3 years see the extended change log.
For changes to our browser extension see the extension change log.
5th September 2026 - v19.0.0
- Major update to internal LTS libraries
- Tests updated in line with official specifications:
- HTML5 Living Standard, 2 September 2026
- Accessible Rich Internet Applications (WAI-ARIA) 1.3, 04 June 2026
- ARIA in HTML, 11 August 2026
- Core Accessibility API Mappings 1.2, 29 August 2026
- HTML Accessibility API Mappings 1.0, 29 August 2026
- Accessible Name and Description Computation 1.2, 27 August 2026
- CSS Fonts Module Level 4, 31 August 2026
- CSS Text Module Level 4, 14 August 2026
- CSS Text Module Level 3, 14 August 2026
- CSS Font Module Level 5, 11 August 2026
- CSS Color Module Level 4, 6 August 2026
- CSS Color Module Level 5, 31 July 2026
- CSS Color HDR Module Level 1, 28 July 2026
- CSS Gaps Module Level 1, 24 June 2026
- CSS Display Module Level 3, 5 June 2026
- Bug Fixes:
- Ignore "data:" URIs as they could contain anything
4th May 2026 - v18.6.0
- Tests updated in line with official specifications:
- HTML5 Living Standard, 24 April 2026
- ARIA in HTML, 15 April 2026
- Core Accessibility API Mappings 1.2, 30 April 2026
- HTML Accessibility API Mappings 1.0, 30 April 2026
- Accessible Name and Description Computation 1.2, 30 April 2026
- CSS Color Module Level 4, 27 April 2026
- CSS Fonts Module Level 4, 22 April 2026
- CSS Color Module Level 5, 13 April 2026
- CSS Image Animation Module Level 1, 9 April 2026
- CSS Basic User Interface Module Level 3 (CSS3 UI), 7 April 2026
- CSS Anchor Positioning Module Level 1, 27 March 2026
- CSS Color HDR Module Level 1, 3 March 2026
- CSS Fonts Module Level 5, 3 March 2026
- Media Queries Level 5, 19 February 2026
- Media Queries Level 4, 19 February 2026
- CSS Gap Decorations Module Level 1, 27 February 2026
- Selectors Level 5, 17 February 2026
- CSS Rhythmic Sizing Module Level 1, 17 February 2026
- CSS Transitions Module Level 2, 4 February 2026
- CSS Box Alignment Module Level 3, 30 January 2026
- Selectors Level 4, 22 January 2026
- CSS Grid Layout Module Level 3, 21 January 2026
- CSS Basic User Interface Module Level 4, 20 January 2026
- CSS Transitions Module Level 1, 8 January 2026
- Bug Fixes:
- Application fail with partial URLs in ASCII Art test
3rd January 2026 - v18.5.0
- Support for macOS Tahoe
- Updated all libraries to latest versions
- Additional CSS and ARIA tests
- Tests updated in line with official specifications:
- HTML5 Living Standard, 17 December 2025
- Core Accessibility API Mappings 1.2, 16 December 2025
- HTML Accessibility API Mappings 1.0, 16 December 2025
- Accessible Name and Description Computation 1.2, 16 December 2025
- CSS Grid Layout Module Level 3, 23 December 2025
- CSS Anchor Positioning Module Level 1, 22 December 2025
- CSS Shadow Parts Module Level 1, 16 December 2025
- CSS Color Adjustment Module Level 1, 16 December 2025
- CSS Borders and Box Decorations Module Level 4, 16 December 2025
- CSS Generated Content Module Level 3, 4 December 2025
- CSS Logical Properties and Values Level 1, 4 December 2025
- CSS Color HDR Module Level 1, 2 December 2025
- Pointer Events Level 3, 6 November 2025
- CSS Display Module Level 4, 6 November 2025
- CSS Flexible Box Layout Module Level 1, 14 October 2025
- CSS Anchor Positioning, 7 October 2025
- CSS Overflow Module Level 3, 7 October 2025
- CSS Positioned Layout Module Level 4, 7 October 2025
- CSS Positioned Layout Module Level 3, 7 October 2025
- CSS Images Module Level 4, 30 September 2025
- CSS Conditional Rules Module Level 4, 4 September 2025
- Motion Path Module Level 1, 5 November 2024
- Bug Fixes:
- False positives for certain 8-character colours
6th September 2025 - v18.4.0
- Small HTML and Print report improvements
- Updated all libraries to latest versions
- Tests updated in line with official specifications:
- HTML5 Living Standard, 03 September 2025
- ARIA in HTML, 05 August 2025
- WCAG 2.1, 06 May 2025
- Core Accessibility API Mappings 1.2, 27 August 2025
- HTML Accessibility API Mappings 1.0, 30 July 2025
- Accessible Name and Description Computation 1.2, 17 June 2025
- CSS Color Adjustment Module Level 1, 12 August 2025
- CSS Positioned Layout Module Level 4, 8 July 2025
- CSS Pseudo-Elements Module Level 4, 27 June 2025
- CSS Shapes Module Level 1, 12 June 2025
- CSS Anchor Positioning, 09 May 2025
- Bug Fixes:
- A few CSS properties for SVG were displaying false positives