Web/Html Dialog "Message box like"

Developers Ruby API
2

This suffices for a simple dialog. If your requirements grow, you would save the html string into a file and load it with set_file, then move the JavaScript call from inline into a <script> block or a separate file (same for styles), etc.
See here for the documentation.

def show_my_messagebox(message, title)
  properties = {
    :dialog_title => title,
    :scrollable => false,
    :width => 300,
    :height => 350
  }
  html = <<-HTML
  <html>
    <body>
      <img src="https://www.sketchup.com/themes/sketchup_www_terra/images/SU_FullColor.png" width="100%" />
      <h1>#{title}</h1>
      <p>#{message}</p>
      <div style="text-align: center">
        <button onclick="window.sketchup.close()">Close</button>
      </div>
    </body>
  </html>
  HTML
  dialog = UI::HtmlDialog.new(properties)
  dialog.set_html(html)
  dialog.add_action_callback('close') { |action_context|
    dialog.close
  }
  dialog.center
  dialog.show_modal
end

show_my_messagebox("You are using SketchUp #{Sketchup.version} with Ruby #{RUBY_VERSION}", "Hello SketchUpper!")
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