Default Quill formats lost when implementing the customTagAttributes and other custom handlers

[Azuf]

When implementing any of the custom functions in the config, such as the customTagAttributes and returning classes as below, it replaces the default classes added by quill. How can I change this so it appends the custom class to the Quill classes instead?

let converter = new QuillDeltaToHtmlConverter(data, {
	  customTagAttributes: (op) => {
		    if (op.attributes.customAttribute) {
			      return {
			        	class: "customClassForTheCustomAttribute`,
			      };
	      	}
	  },
});

[volser]

can you provide an exmaple, please?

[SikoSoft]

Did you ever get this working? I became curious about this wanting to implement my own srcset attribute for images but don't see this callback actually running at any point.