.htmlhintrc

{
  "tagname-lowercase": true,
  "tagname-specialchars": true,
  "empty-tag-not-self-closed": true,
  "tag-self-close": false,
  "tag-pair": false,
  "tag-no-obsolete": true,
  "tags-check": false,

  // Scala code in the twirl templates creates false positives. Browsers lowercase attr names on their own anyway.
  "attr-lowercase": false,
  // If getting twirl false positives, removing space between paren and curly brace on if statements might fix it.
  "attr-no-duplication": true,
  "attr-value-not-empty": false,
  "attr-value-double-quotes": false,
  "attr-value-single-quotes": false,
  "attr-value-no-duplication": true,
  "attr-unsafe-chars": true,
  // If getting twirl false positives, removing space after "<-" might fix it, possibly even on the previous line.
  "attr-no-unnecessary-whitespace": true,
  "attr-whitespace": false,
  "attr-sorted": false,

  "id-unique": true, // For a twirl template false positive, you can often rewrite it slightly to not duplicate the ID.
  "id-class-value": false,
  "id-class-ad-disabled": true,

  // If the src field is filled in with JS, you can add a transparent square placeholder:
  // src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"
  "src-not-empty": true,
  "href-abs-or-rel": false,

  "alt-require": true,
  "title-require": true,
  "frame-title-require": true,
  "input-requires-label": true,
  "button-type-require": true,
  "form-method-require": false,
  "h1-require": false,
  "main-require": false,

  "doctype-first": false,
  "doctype-html5": true,
  "html-lang-require": true,
  "head-script-disabled": false, // Nontrivial refactor to enable, but would give a small speedup to first paint.
  "meta-charset-require": false,
  "meta-viewport-require": false,
  "meta-description-require": false,
  "link-rel-canonical-require": false,

  "style-disabled": false,
  "script-disabled": false,
  "inline-style-disabled": true,
  "inline-script-disabled": true,

  "spec-char-escape": false,
  "space-tab-mixed-disabled": "space"
}