What is the WordPress `do_blocks()` function and how does it enable the server-side rendering pipeline?

Question

WordPress Expert — Hard

What is the WordPress `do_blocks()` function and how does it enable the server-side rendering pipeline?

Accepted Answer

The WordPress `do_blocks()` function is the core of the block rendering engine. It parses block grammar, iterates through each block, applies block-level filters, and concatenates the output. It's called via the_content filter to enable server-side rendering.