Initial commit with some working code and basic example.

examples/helloworld/Makefile

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+GO := $(shell which go)
+GO112_VERSION := 1.12.16
+GO112 := go${GO112_VERSION}
+
+GOPHERJS := $(shell which gopherjs 2> /dev/null)
+
+## start-web       : Starts GopherJS serving.
+start-web:
+	GOPHERJS_GOROOT="${HOME}/sdk/${GO112}" ${GOPHERJS} serve . -v
+
+## prepare         : Installs Go 1.12 and GopherJS. Go must be already installed.
+prepare: prepare-go prepare-gopherjs
+
+## prepare-go      : Prepares specific Go tooling for GopherJS. Go must be already installed.
+prepare-go:
+	@echo "* Getting Go 1.12.16 (required by gopherjs)"
+	@${GO} get golang.org/dl/${GO112}
+	@${GO112} download
+
+## prepare-gopherjs: Prepares GopherJS (e.g. compiles it).
+prepare-gopherjs:
+	@echo "* Getting gopherjs..."
+	@${GO112} get -u -v github.com/gopherjs/gopherjs
+
+help : Makefile
+	@echo "helloworld Makefile available subcommands:\n"
+	@sed -n 's/^## //p' $<
+
+.DEFAULT_GOAL := help

examples/helloworld/README.md

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+# BulpherJS Hello World
+
+This directory contains "hello world" example application with example Makefile. Feel free to use it in your applications.
+
+To start issue this command:
+
+```shell
+make start-web
+```
+
+And open http://localhost:8080.
+
+Makefile is self-documentational with default goal to show help. Issue ``make`` to get list of available targets.

examples/helloworld/main.go

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+package main
+
+import (
+	"github.com/gopherjs/gopherjs/js"
+
+	"go.dev.pztrn.name/bulpherjs/common"
+	"go.dev.pztrn.name/bulpherjs/elements"
+)
+
+func main() {
+	document := js.Global.Get("document")
+	document.Call("addEventListener", "DOMContentLoaded", func(event *js.Object) {
+		js.Global.Get("console").Call("log", "Hello world!")
+
+		constructHeader()
+		constructBody()
+	})
+}
+
+func constructBody() {
+	mainSection := elements.NewSection(&elements.SectionOptions{Class: "section"})
+
+	mainDiv := elements.NewDiv(&elements.DivOptions{
+		Class: "container",
+		ID:    "mainContainer",
+	})
+	mainSection.AddChild(mainDiv)
+
+	// Columns divs.
+	columnsDiv := elements.NewDiv(&elements.DivOptions{
+		Class: "columns",
+		ID:    "mainColumns",
+	})
+	mainDiv.AddChild(columnsDiv)
+
+	// Click-Me button should be in the middle of screen.
+	centerDiv := elements.NewDiv(&elements.DivOptions{
+		Class: "column is-half is-offset-two-fifths",
+	})
+	columnsDiv.AddChild(centerDiv)
+
+	startTestButton := elements.NewButton(&elements.ButtonOptions{
+		Class: "button is-large is-rounded is-primary",
+		Text:  "Click Me!",
+		OnClickHandler: func(e *js.Object) {
+			common.Log("Button clicked! Hooray")
+		},
+	})
+	centerDiv.AddChild(startTestButton)
+
+	js.Global.Get(common.HTMLElementDocument).
+		Get(common.HTMLElementBody).
+		Call(common.JSCallAppendChild, mainSection.Build())
+}
+
+func constructHeader() {
+	link := elements.NewLink(&elements.LinkOptions{
+		Href: "//cdn.jsdelivr.net/npm/bulma@0.8.0/css/bulma.min.css",
+		ID:   "",
+		Rel:  "stylesheet",
+	})
+
+	js.Global.Get(common.HTMLElementDocument).Get(common.HTMLElementHead).Call(common.JSCallAppendChild, link.Build())
+
+	metaViewport := elements.NewMeta(&elements.MetaOptions{
+		Content: "width=device-width, initial-scale=1",
+		Name:    "viewport",
+	})
+
+	js.Global.Get(common.HTMLElementDocument).Get(common.HTMLElementHead).Call(common.JSCallAppendChild, metaViewport.Build())
+
+	js.Global.Get(common.HTMLElementDocument).Set(common.HTMLHeadElementTitle, "BulpherJS Hello World application")
+}