This ruby script will summarize the html5 semantic structure of a webpage so that you can more easily ensure the page is correct.

semantic_summary.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'nokogiri'
require 'open-uri'

url = ARGV[0]

class Document < Nokogiri::XML::SAX::Document
  SEMANTIC_CONTAINERS = %w(body article section nav aside hgroup header footer)
  COUNT_ELEMENTS = %w(p a)
  TEXTUAL_ELEMENTS = %w(h1 h2 h3 h4 h5 h6 title)
  def initialize(*args)
    super
    @depth = 0
    @text = nil
    @counts = []
    @last_headings = []
  end
  def start_element(name, attributes = [])
    @id = nil
    attributes.each do |(attr_name, value)|
      case attr_name
      when "id"
        @id = value
      end
    end
    if SEMANTIC_CONTAINERS.include?(name)
      start_semantic_container(name)
    elsif COUNT_ELEMENTS.include?(name)
      @counts.last[name] ||= 0
      @counts.last[name] += 1
    elsif TEXTUAL_ELEMENTS.include?(name)
      @text = ""
    end
  end
  def start_semantic_container(name)
    emit_tag(name)
    @depth += 1
    @counts << {}
    @text = nil
    @last_headings << nil
  end
  def end_semantic_container(name)
    @depth -= 1
    @counts.last.each do |counted, count|
      puts "#{"  " * (@depth + 1)}#{counted} - #{count} times"
    end
    @counts.pop
    @last_headings.pop
  end
  def characters(text)
    @text << text.strip if @text
  end
  def end_element(name)
    if SEMANTIC_CONTAINERS.include?(name)
      end_semantic_container(name)
    elsif TEXTUAL_ELEMENTS.include?(name)
      emit_tag(name)
      @text = nil
    end
  end

  private
  def emit_tag(name)
    tag = "#{"  " * @depth}#{name}#{"#" + @id if @id}"
    tag << %Q{: "#{@text}"} if @text && @text.length > 0
    puts tag
  end
end

parser = Nokogiri::HTML::SAX::Parser.new(Document.new)
parser.parse(open(url).read)

some_example_output.txt

title: "Addressing Daily Home Care | Caring.com"
body#articles_show
  header
    a - 5 times
  nav#top-nav-element
    a - 36 times
  aside#promo-phone-number-banner
    h5: "Talk to a Caring Advisor for free:"
  aside
    h6: "Advertisement"
    a - 1 times
  aside
    h6: "Page Sponsored By"
    a - 1 times
  aside
    h6: "Advertisement"
    a - 1 times
  article
    h1: "Providing Home Care for an Older Adult: A Good Fit?"
    h2: "What to consider when an older adult needs daily care at home"
    h3: "Will it work on a practical level for her to live at home?"
    h3: "Can you or she afford it?"
    h2: "Do you have enough caregiving and emotional support to provide daily care to an older adult?"
    footer
      h6#rating-control: "Was this article helpful?"
      nav
        h5: "Recommended for You"
        aside
          h6: "Sponsored Content"
          a - 1 times
        a - 5 times
      a - 5 times
    aside
      h6: "Comments"
      section
      article
        header
          a - 1 times
        h6: "Lorem ipsum dolor sit amet, consectetur"
        footer
        a - 4 times
      article
        header
          a - 1 times
        h6: "For almost everyone, from children"
        footer
        a - 4 times
      article
        header
          a - 1 times
        h6: "When my mother ran out of money,"
        footer
        a - 4 times
    p - 6 times
    a - 9 times
  aside
    h6: "Advertisement"
    a - 1 times
  aside#right-rail-review-widget
    h5#widget-title: "Latest Senior Care Reviews"
    h6: "Find More Providers Near You"
    a - 3 times
  aside
    h6: "Advertisement"
    a - 1 times
  aside#klippy
    h6: "Related Topics"
    a - 3 times
  aside#stay-connected-unit
    h6: "Stay Connected With Caring.com"
    a - 2 times
  aside#footer-gallery
    h2: "Also from Caring.com"
    p - 20 times
    a - 40 times
  aside#action-bar
    h6: "Share this page"
    a - 7 times
  footer#footer
    nav
      h2: "General Info"
      h2: "Quick Links"
      h2: "Site Help"
      a - 20 times