in response to https://twitter.com/pdimitar/status/648458395675164672

main.go

package main

import (
	"log"
	"os"

	"golang.org/x/net/html"
)

func main() {
	n := &html.Node{
		Type: html.ElementNode,
		Data: "div",
	}
	check := &html.Node{
		Type: html.ElementNode,
		Data: "div",
	}
	check.AppendChild(&html.Node{
		Type: html.TextNode,
		Data: "hey check this out",
	})
	n.AppendChild(check)

	neat := &html.Node{
		Type: html.ElementNode,
		Data: "div",
	}
	neat.AppendChild(&html.Node{
		Type: html.TextNode,
		Data: "kinda neat imo",
	})
	neat.AppendChild(&html.Node{
		Type: html.ElementNode,
		Data: "br",
	})
	check.AppendChild(neat)

	sweet := &html.Node{
		Type: html.ElementNode,
		Data: "div",
	}
	sweet.AppendChild(&html.Node{
		Type: html.TextNode,
		Data: "haha sweet",
	})
	n.AppendChild(sweet)

	err := html.Render(os.Stdout, n)
	if err != nil {
		log.Fatal(err)
	}
	_, err = os.Stdout.Write([]byte{'\n'})
	if err != nil {
		log.Fatal(err)
	}
}

output

$ go run main.go 
<div><div>hey check this out<div>kinda neat imo<br/></div></div><div>haha sweet</div></div>