Full Site Editing follows WordPress’s own coding standards and guidelines rather than separate international standards. The primary framework is the WordPress Theme Review Guidelines, which serve as the de facto international standard for FSE theme development across the global WordPress community.
The WordPress coding standards encompass PHP, HTML, CSS, and JavaScript standards that align with widely accepted web development practices. These include PSR coding standards for PHP, W3C guidelines for HTML and CSS, and ECMAScript standards for JavaScript. Additionally, FSE themes must comply with WordPress accessibility standards, which follow WCAG guidelines for international web accessibility.
Theme.json schema serves as another standardization layer, providing a consistent API for theme configuration across all FSE themes globally. This JSON-based approach ensures that themes maintain compatibility and consistency regardless of their origin or target market. The WordPress Core team continuously updates these standards to reflect evolving web technologies and international best practices in theme development.