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How do i pass values to an extended template?

while following your example,
I have few issues i described in comments. can you please advise?

package main

import (
	"log"
	"net/http"

	"github.com/thedevsaddam/renderer"
)

var rnd *renderer.Render

func init() {
	rnd = renderer.New(
		renderer.Options{
			ParseGlobPattern: "html/*.html",
		},
	)
}

func handler(w http.ResponseWriter, r *http.Request) {

       # **i was able to declare a struct here.** 

        usr := struct {
		Name string
		Age  int
	}{"john doe", 30}
        
        ## passed in `usr`  here
	err := rnd.HTML(w, http.StatusOK, "indexPage", usr)
	if err != nil {
		log.Fatal(err)
	}
}

func main() {
	http.HandleFunc("/", handler)
	log.Println("Listening port: 9000")
	http.ListenAndServe(":9000", nil)
}

# html/index.html

{{define "indexPage"}}
    <html>
    {{template "header"}}
    <body>
        <h3>Index</h3>
**## this works**
<h1>Hello, {{ .Name }}</h1>
        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit</p>
    </body>
    {{template "footer"}}
    </html>
{{end}}

html/header.html

{{define "header"}}
     <head>
         <title>Header</title>
## this, no; not even `usr.Name`
<h1>Hello, {{ .Name }}</h1>
         <h1>Header section</h1>
     </head>
{{end}}

can you please advise on how do i pass values on extended template?

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