void appendHtml(String text, { NodeValidator validator, NodeTreeSanitizer treeSanitizer })

Parses the specified text as HTML and adds the resulting node after the last child of this element.

Source 

void appendHtml(String text, {NodeValidator validator,
    NodeTreeSanitizer treeSanitizer}) {
  this.insertAdjacentHtml('beforeend', text, validator: validator,
      treeSanitizer: treeSanitizer);
}