Function addCustomElement

modules/tinymce/src/core/main/ts/api/html/Schema.ts:207–316

(name: string, spec: CustomElementSpec)

  };

  const addCustomElement = (name: string, spec: CustomElementSpec) => {
    // Flush cached items since we are altering the default maps
    delete mapCache.text_block_elements;
    delete mapCache.block_elements;

    const inline = spec.extends ? !isBlock(spec.extends) : false;
    const cloneName = spec.extends;

    children[name] = cloneName ? children[cloneName] : {};
    customElementsMap[name] = cloneName ?? name;

    // Treat all custom elements as being non-empty by default
    nonEmptyElementsMap[name.toUpperCase()] = {};
    nonEmptyElementsMap[name] = {};

    // If it's not marked as inline then add it to valid block elements
    if (!inline) {
      blockElementsMap[name.toUpperCase()] = {};
      blockElementsMap[name] = {};
    }

    // Add elements clone if needed
    if (cloneName && !elements[name] && elements[cloneName]) {
      const customRule = SchemaUtils.deepCloneElementRule(elements[cloneName]);

      delete customRule.removeEmptyAttrs;
      delete customRule.removeEmpty;

      elements[name] = customRule;
    } else {
      elements[name] = { attributesOrder: [], attributes: { }};
    }

    // Add custom attributes
    if (Type.isArray(spec.attributes)) {
      const processAttrName = (name: string) => {
        customRule.attributesOrder.push(name);
        customRule.attributes[name] = {};
      };

      const customRule = elements[name] ?? {};

      delete customRule.attributesDefault;
      delete customRule.attributesForced;
      delete customRule.attributePatterns;
      delete customRule.attributesRequired;

      customRule.attributesOrder = [];
      customRule.attributes = {};

      Arr.each(spec.attributes, (attrName) => {
        const globalAttrs = GlobalAttributesSet.getGlobalAttributeSet(schemaType);
        ValidChildrenRuleParser.parseValidChild(attrName).each(({ preset, name }) => {
          if (preset) {
            if (name === 'global') {
              Arr.each(globalAttrs, processAttrName);
            }
          } else {