TinyMCE editar contenido HTML5

Documentacion Original 

https://www.tiny.cloud/docs-4x/demo/format-html5/

Instalando el Plugin  visualblocks:

tinymce.init({
  selector: 'textarea',
  height: 500,
  plugins: 'visualblocks',
    content_css: [
    '//fonts.googleapis.com/css?family=Lato:300,300i,400,400i',
    '//www.tinymce.com/css/codepen.min.css'
  ],
  style_formats: [
    { title: 'Headers', items: [
      { title: 'h1', block: 'h1' },
      { title: 'h2', block: 'h2' },
      { title: 'h3', block: 'h3' },
      { title: 'h4', block: 'h4' },
      { title: 'h5', block: 'h5' },
      { title: 'h6', block: 'h6' }
    ] },

    { title: 'Blocks', items: [
      { title: 'p', block: 'p' },
      { title: 'div', block: 'div' },
      { title: 'pre', block: 'pre' }
    ] },

    { title: 'Containers', items: [
      { title: 'section', block: 'section', wrapper: true, merge_siblings: false },
      { title: 'article', block: 'article', wrapper: true, merge_siblings: false },
      { title: 'blockquote', block: 'blockquote', wrapper: true },
      { title: 'hgroup', block: 'hgroup', wrapper: true },
      { title: 'aside', block: 'aside', wrapper: true },
      { title: 'figure', block: 'figure', wrapper: true }
    ] }
  ],
  visualblocks_default_state: true,
  end_container_on_empty_block: true
 });	

Este ejemplo muestra cómo editar contenido HTML5, como secciones y artículos