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Styling & Theming
Adding DOM Attributes

Adding DOM Attributes

You can set additional HTML attributes on a number of DOM elements inside the editor. There include:

editor: The editor itself, excluding menus & toolbars.

block: The main container element for blocks. Contains both the block's content and its nested blocks.

blockGroup: The wrapper element for all top-level blocks in the editor and nested blocks.

blockContent: The wrapper element for a block's content.

inlineContent: The wrapper element for a block's rich-text content.

In the demo below, we set a custom class on the block element to add a border to each block:

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import "@blocknote/core/fonts/inter.css";
import { BlockNoteView, useCreateBlockNote } from "@blocknote/react";
import "@blocknote/react/style.css";
 
import "./styles.css";
 
export default function App() {
  // Creates a new editor instance.
  const editor = useCreateBlockNote({
    // Sets attributes on DOM elements in the editor.
    domAttributes: {
      // Adds a class to all `blockContainer` elements.
      block: {
        class: "hello-world-block",
      },
    },
    initialContent: [
      {
        type: "paragraph",
        content: "Welcome to this demo!",
      },
      {
        type: "paragraph",
        content: "You can see there's a border around each block",
      },
      {
        type: "paragraph",
        content: [
          {
            type: "text",
            text: "This is because there's a CSS rule using the ",
            styles: {},
          },
          {
            type: "text",
            text: "hello-world-block",
            styles: { code: true },
          },
          {
            type: "text",
            text: " class we added",
            styles: {},
          },
        ],
      },
      {
        type: "paragraph",
      },
    ],
  });
 
  // Renders the editor instance using a React component.
  return <BlockNoteView editor={editor} />;
}
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