6. How to create a custom tag

You can use CustomTag class to create a custom tag. See the below sample

CustomTag customTag = new CustomTag("newtag", null, new Id("ct1Id")) {
	CustomTag customTag = new CustomTag("anothertag", this);
};
System.out.println(customTag.toHtmlString(true));

which prints

<newtag id="ct1Id">
    <anothertag></anothertag>
</newtag>

OR you can keep your own class for a new tag by extending CustomTag class, eg:-

import com.webfirmframework.wffweb.tag.html.AbstractHtml;
import com.webfirmframework.wffweb.tag.html.attribute.core.AbstractAttribute;
import com.webfirmframework.wffweb.tag.htmlwff.CustomTag;

public class NewTag extends CustomTag {

    private static final long serialVersionUID = 1L;

    public NewTag(AbstractHtml base, AbstractAttribute... attributes) {
        super("newtag", TagType.OPENING_CLOSING, base, attributes);
    }

    // TODO your own feature methods

    @Override
    public NewTag clone() throws CloneNotSupportedException {
        return (NewTag) super.clone();
    }

}

and you can use it as

public static void main(String[] args) {
    NewTag newTag = new NewTag(null, new Id("1")) {
        NewTag newTag = new NewTag(this, new Id("2"));
    };
        
    System.out.println(newTag.toHtmlString(true));
}

this will print

<newtag id="1">
    <newtag id="2"></newtag>
</newtag>