SortSite 6.58 Maintenance Release

This release includes support for declarative shadow roots, improved CSS support, plus the latest changes to the W3 HTML and CSS validators.

New Features

• Cascade support for nested CSS rules
• Support for declarative shadow roots (shadowrootmode)
• Validation of CSS in HTML style attributes

Rule Changes

• Updated browser compatibility checks to Chrome/Edge 142, FF 144, Opera 122, Safari 26
• Updated to October 2025 HTML 5 Validator
• Updated to October 2025 CSS Validator
• Updated to August 2025 URL Standard
• See full list of changed rules in engine 6.58

Fixes

• Various stability fixes and performance improvements