Block Themes: Migrating Classic Theme CSS to Global Styles JSON

Question

Transitioning from a Classic Theme to a Block Theme in WordPress 6.0+ involves moving from PHP-based template files and external CSS stylesheets to the Full Site Editing (FSE) framework. A core component of this shift is the use of theme.json for Global Styles, which centralizes design tokens for colors, typography, and spacing.

While the Site Editor allows for visual adjustments, developers migrating legacy themes face uncertainty regarding the mapping of complex, nested CSS selectors to the flat structure of the Global Styles configuration. There is a risk of visual regressions when custom CSS logic is replaced by the block-based style system, particularly for elements that do not map directly to standard block properties.

How can specific CSS cascade logic be effectively translated into the theme.json schema without relying on additional custom stylesheets?
  What is the recommended approach for maintaining legacy layout constraints that exceed the current capabilities of the Global Styles API?

Block Themes: Migrating Classic Theme CSS to Global Styles JSON

0 answers

Your perspective belongs here.

0 question comments