good good study, day day up!

vendor/gopl.io/ch4/autoescape/main.go

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+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 117.
+
+// Autoescape demonstrates automatic HTML escaping in html/template.
+package main
+
+import (
+	"html/template"
+	"log"
+	"os"
+)
+
+//!+
+func main() {
+	const templ = `<p>A: {{.A}}</p><p>B: {{.B}}</p>`
+	t := template.Must(template.New("escape").Parse(templ))
+	var data struct {
+		A string        // untrusted plain text
+		B template.HTML // trusted HTML
+	}
+	data.A = "<b>Hello!</b>"
+	data.B = "<b>Hello!</b>"
+	if err := t.Execute(os.Stdout, data); err != nil {
+		log.Fatal(err)
+	}
+}
+
+//!-