Tighten htmlhint's rules.

_includes/header.html

@@ -4,9 +4,9 @@
 
 <title>
   {%- if page.title -%}
-    {{ page.title }} &middot; {{ site.title }}
+    {{ page.title }} · {{ site.title }}
   {%- else -%}
-    {{ site.title }} &middot; {{ site.description }}
+    {{ site.title }} · {{ site.description }}
   {%- endif -%}
 </title>
 

build/.htmllintrc

@@ -1,19 +1,38 @@
 {
+  "alt-require": true,
   "attr-bans": ["align", "background", "bgcolor", "border", "frameborder", "longdesc", "marginwidth", "marginheight", "scrolling"],
+  "attr-lowercase": true,
   "attr-name-style": false,
-  "attr-no-unsafe-char": false,
+  "attr-no-duplication": true,
+  "attr-unsafe-char": true,
+  "attr-value-double-quotes": true,
+  "attr-value-not-empty": true,
   "class-style": "dash",
   "doctype-first": true,
   "doctype-html5": true,
   "fig-req-figcaption": false,
-  "html-valid-content-model": false,
+  "head-script-disabled": true,
+  "href-abs-or-rel": false,
+  "html-valid-content-model": true,
+  "id-class-ad-disabled": true,
   "id-class-ignore-regex": "(onclick|content|[a-z]+([A-Z][a-z])+)",
   "id-class-style": "dash",
-  "img-req-src": false,
+  "id-class-value": "dash",
+  "id-unique": true,
   "img-req-alt": false,
+  "img-req-src": false,
   "indent-style": "spaces",
   "indent-width": 2,
+  "inline-script-disabled": false,
+  "inline-style-disabled": true,
+  "space-tab-mixed-disabled": "space",
   "spec-char-escape": false,
+  "src-not-empty": true,
+  "style-disabled": true,
   "tag-bans": ["b", "i"],
-  "title-max-len": false
+  "tagname-lowercase": true,
+  "tag-pair": true,
+  "tag-self-close": false,
+  "title-max-len": 70,
+  "title-require": true
 }

js/tests/visual/popover.html

@@ -22,8 +22,7 @@ <h1>Popover <small>Bootstrap Visual Test</small></h1>
         Popover on right
       </button>
 
-      <button type="button" class="btn btn-secondary" data-container="body" data-toggle="popover" data-placement="bottom" data-content="Vivamus
-      sagittis lacus vel augue laoreet rutrum faucibus.">
+      <button type="button" class="btn btn-secondary" data-container="body" data-toggle="popover" data-placement="bottom" data-content="Vivamus sagittis lacus vel augue laoreet rutrum faucibus.">
         Popover on bottom
       </button>