Boolean attributes by tag name

bools.json

{
  "a": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "abbr": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "address": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "area": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "noHref",
    "spellcheck",
    "translate"
  ],
  "article": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "aside": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "audio": [
    "autoplay",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "controls",
    "defaultMuted",
    "draggable",
    "ended",
    "hidden",
    "isContentEditable",
    "itemScope",
    "loop",
    "muted",
    "paused",
    "seeking",
    "spellcheck",
    "translate"
  ],
  "b": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "base": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "bdi": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "bdo": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "blockquote": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "body": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "br": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "button": [
    "autofocus",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "formNoValidate",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate",
    "willValidate"
  ],
  "canvas": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "caption": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "cite": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "code": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "col": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "colgroup": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "command": [
    "checked",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "data": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "datalist": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "dd": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "del": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "details": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "open",
    "spellcheck",
    "translate"
  ],
  "dfn": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "dialog": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "open",
    "spellcheck",
    "translate"
  ],
  "div": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "dl": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "compact",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "dt": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "em": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "embed": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "fieldset": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate",
    "willValidate"
  ],
  "figcaption": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "figure": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "footer": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "form": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "noValidate",
    "spellcheck",
    "translate"
  ],
  "h1": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "h2": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "h3": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "h4": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "h5": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "h6": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "head": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "header": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "hgroup": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "hr": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "noShade",
    "spellcheck",
    "translate"
  ],
  "html": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "i": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "iframe": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "seamless",
    "spellcheck",
    "translate"
  ],
  "img": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "complete",
    "draggable",
    "hidden",
    "isContentEditable",
    "isMap",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "input": [
    "autofocus",
    "checked",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "defaultChecked",
    "disabled",
    "draggable",
    "formNoValidate",
    "hidden",
    "indeterminate",
    "isContentEditable",
    "itemScope",
    "multiple",
    "readOnly",
    "required",
    "spellcheck",
    "translate",
    "willValidate"
  ],
  "ins": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "kbd": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "keygen": [
    "autofocus",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate",
    "willValidate"
  ],
  "label": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "legend": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "li": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "link": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "map": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "mark": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "menu": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "compact",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "meta": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "meter": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "nav": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "noscript": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "object": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "declare",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate",
    "typeMustMatch",
    "willValidate"
  ],
  "ol": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "compact",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "reversed",
    "spellcheck",
    "translate"
  ],
  "optgroup": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "option": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "defaultSelected",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "selected",
    "spellcheck",
    "translate"
  ],
  "output": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate",
    "willValidate"
  ],
  "p": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "param": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "pre": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "progress": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "q": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "rp": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "rt": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "ruby": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "s": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "samp": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "script": [
    "async",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "defer",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "section": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "select": [
    "autofocus",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "multiple",
    "required",
    "spellcheck",
    "translate",
    "willValidate"
  ],
  "small": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "source": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "span": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "strong": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "style": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "scoped",
    "spellcheck",
    "translate"
  ],
  "sub": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "summary": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "sup": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "table": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "tbody": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "td": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "noWrap",
    "spellcheck",
    "translate"
  ],
  "textarea": [
    "autofocus",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "disabled",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "readOnly",
    "required",
    "spellcheck",
    "translate",
    "willValidate"
  ],
  "tfoot": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "th": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "noWrap",
    "spellcheck",
    "translate"
  ],
  "thead": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "time": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "title": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "tr": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "track": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "default",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "u": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "ul": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "compact",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "var": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "video": [
    "autoplay",
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "controls",
    "defaultMuted",
    "draggable",
    "ended",
    "hidden",
    "isContentEditable",
    "itemScope",
    "loop",
    "muted",
    "paused",
    "seeking",
    "spellcheck",
    "translate"
  ],
  "wbr": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ],
  "frameset": [
    "commandChecked",
    "commandDisabled",
    "commandHidden",
    "draggable",
    "hidden",
    "isContentEditable",
    "itemScope",
    "spellcheck",
    "translate"
  ]
}

extract.rb

require 'watir-webdriver/html'
require 'json'


class BooleanAttributeFinder

  IGNORED_ELEMENTS = [
    "Element" # not defined by HTML
  ]

  def initialize(spec_url)
    @extractor = Watir::HTML::SpecExtractor.new(spec_url)
    @tag_to_interfaces = @extractor.process
  end

  def result
    map = Hash.new { |hash, key| hash[key] = [] }

    @tag_to_interfaces.each do |tag, interfaces|
      interfaces.each do |interface|
        map[tag] += boolean_attributes_for(interface)
      end
    end

    result = {}

    map.each do |tag, attrs|
      result[tag] = attrs.uniq.sort
    end

    result
  end

  def boolean_attributes_for(interface)
    result = interface.members.select { |e| e.kind_of?(WebIDL::Ast::Attribute) && e.type.name == :Boolean }.map { |e| e.name }

    if interface.inherits
      interface.inherits.each do |scoped_name|
        # Element is not defined in the HTML spec
        next if IGNORED_ELEMENTS.include?(scoped_name.name)

        parents = @extractor.fetch_interface(scoped_name.name)

        parents.flatten.each do |parent|
          result += boolean_attributes_for(parent)
        end
      end
    end

    result
  end
end

baf = BooleanAttributeFinder.new(ENV['SPEC_PATH'] || "http://www.whatwg.org/specs/web-apps/current-work/")
puts JSON.pretty_generate(baf.result)

Gemfile

source :rubygems

gem "webidl"
gem "nokogiri"
gem "activesupport"
gem "watir-webdriver", :git => "git://github.com/watir/watir-webdriver"