Edit file File name : block.json Content :{ "$schema": "https://schemas.wp.org/trunk/block.json", "apiVersion": 3, "name": "core/heading", "title": "Heading", "category": "text", "description": "Introduce new sections and organize content to help visitors (and search engines) understand the structure of your content.", "keywords": [ "title", "subtitle" ], "textdomain": "default", "attributes": { "textAlign": { "type": "string" }, "content": { "type": "rich-text", "source": "rich-text", "selector": "h1,h2,h3,h4,h5,h6", "role": "content" }, "level": { "type": "number", "default": 2 }, "levelOptions": { "type": "array" }, "placeholder": { "type": "string" } }, "supports": { "align": [ "wide", "full" ], "anchor": true, "className": true, "splitting": true, "__experimentalBorder": { "color": true, "radius": true, "style": true, "width": true, "__experimentalDefaultControls": { "color": true, "radius": true, "style": true, "width": true } }, "color": { "gradients": true, "link": true, "__experimentalDefaultControls": { "background": true, "text": true } }, "spacing": { "margin": true, "padding": true, "__experimentalDefaultControls": { "margin": false, "padding": false } }, "typography": { "fontSize": true, "lineHeight": true, "__experimentalFontFamily": true, "__experimentalFontStyle": true, "__experimentalFontWeight": true, "__experimentalLetterSpacing": true, "__experimentalTextTransform": true, "__experimentalTextDecoration": true, "__experimentalWritingMode": true, "__experimentalDefaultControls": { "fontSize": true } }, "__unstablePasteTextInline": true, "__experimentalSlashInserter": true, "interactivity": { "clientNavigation": true } }, "editorStyle": "wp-block-heading-editor", "style": "wp-block-heading" } Save