diff --git a/src/assets/index.html b/src/assets/index.html
index a549eb9..4769001 100644
--- a/src/assets/index.html
+++ b/src/assets/index.html
@@ -427,12 +427,9 @@
     </div>
     <!-- polyfill -->
     <script src="./static/javascripts/fetch.umd.js"></script>
-    <script src="./static/javascripts/url-polyfill.min.js"></script>
     <!-- external -->
     <script src="./static/javascripts/vue.min.js"></script>
     <script src="./static/javascripts/vue-lazyload.js"></script>
-    <script src="./static/javascripts/Readability.min.js"></script>
-    <script src="./static/javascripts/purify.min.js"></script>
     <!-- internal -->
     <script src="./static/javascripts/api.js"></script>
     <script src="./static/javascripts/app.js"></script>
diff --git a/src/assets/javascripts/app.js b/src/assets/javascripts/app.js
index 14749aa..3bcfd55 100644
--- a/src/assets/javascripts/app.js
+++ b/src/assets/javascripts/app.js
@@ -26,28 +26,6 @@ var debounce = function(callback, wait) {
   }
 }
 
-var sanitize = function(content, base) {
-  // WILD: `item.link` may be a relative link (or some nonsense)
-  try { new URL(base) } catch(err) { base = null }
-
-  var sanitizer = new DOMPurify
-  sanitizer.addHook('afterSanitizeAttributes', function(node) {
-    // set all elements owning target to target=_blank
-    if ('target' in node)
-      node.setAttribute('target', '_blank')
-    // set non-HTML/MathML links to xlink:show=new
-    if (!node.hasAttribute('target') && (node.hasAttribute('xlink:href') || node.hasAttribute('href')))
-      node.setAttribute('xlink:show', 'new')
-
-    // set absolute urls
-    if (base && node.attributes.href && node.attributes.href.value)
-      node.href = new URL(node.attributes.href.value, base).toString()
-    if (base && node.attributes.src && node.attributes.src.value)
-      node.src = new URL(node.attributes.src.value, base).toString()
-  })
-  return sanitizer.sanitize(content, {FORBID_TAGS: ['style'], FORBID_ATTR: ['style', 'class']})
-}
-
 Vue.use(VueLazyload)
 
 Vue.directive('scroll', {
diff --git a/src/assets/javascripts/purify.min.js b/src/assets/javascripts/purify.min.js
deleted file mode 100644
index d2da45c..0000000
--- a/src/assets/javascripts/purify.min.js
+++ /dev/null
@@ -1,3 +0,0 @@
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diff --git a/src/assets/javascripts/url-polyfill.min.js b/src/assets/javascripts/url-polyfill.min.js
deleted file mode 100644
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\ No newline at end of file