Check a rendered template
Render the changed page with realistic content. Include missing optional fields, a long title, several list items, and a second language when applicable.
Check links, image descriptions, heading order, and keyboard access. For category-specific markup, test a resource in the exact category and one that uses the fallback template.
Run the template cross-reference check for missing dependencies. Then check the browser console and network responses for scripts or styles that did not load. Save a screenshot when the visual result matters to review.