The file contains block markup, which is HTML with comments that carry the block name and its attributes, and nothing else. A self-closing block comment is a dynamic…
A template edited in the site editor becomes a wp_template post, and from that moment the file on disk is ignored for that template. This is the single…
A static block’s save output is stored in the post, and changing it invalidates every existing instance unless the old shape is still declared. Without the deprecation the…
A container block can specify what it starts with and what may be added, which is the difference between a layout and a suggestion. allowedBlocks restricts the inserter…
Block metadata used to live in three places — PHP registration, JavaScript registration and an enqueue call — and block.json is all three. apiVersion: 2 is the one…
The duotone effect is implemented as an SVG filter definition injected into the page, which is surprising the first time it appears in a diff of the rendered…
A theme spent a hundred lines on add_theme_support calls and a stylesheet arguing with the editor, and 5.8 replaced both with one file. “custom”: false removes the arbitrary…