@atlaskit/adf-schema/dist/es2019/schema/nodes/placeholder.js

Shared package that contains the ADF-schema (json) and ProseMirror node/mark specs

/**
 * @name placeholder_node
 */

export const placeholder = {
  inline: true,
  group: 'inline',
  selectable: false,
  marks: '',
  attrs: {
    text: {
      default: ''
    }
  },
  parseDOM: [{
    tag: 'span[data-placeholder]',
    getAttrs: dom => ({
      text: dom.getAttribute('data-placeholder') || placeholder.attrs.text.default
    })
  }],
  toDOM(node) {
    const {
      text
    } = node.attrs;
    const attrs = {
      'data-placeholder': text,
      // Needs to be edtiable for mobile to not close keyboard
      contenteditable: 'true'
    };
    return ['span', attrs, text];
  }
};