Block debugging involves understanding the dual nature of blocks – JavaScript edit functions for the editor interface and save functions that generate stored HTML for the frontend display.
The editor runs on JavaScript while the frontend uses PHP to read stored HTML from the database. This creates scenarios where blocks may work on the frontend but break in the editor, or vice versa.
Always test blocks in both the editor and frontend contexts. PHP is more lenient than JavaScript, so frontend functionality doesn’t guarantee editor compatibility. Comprehensive testing prevents user-facing issues.