Use xhr.responseType = 'document'.

src/Menu/DeleteLink.coffee

@@ -55,21 +55,20 @@ DeleteLink =
 
     link = @
     $.ajax $.id('delform').action.replace("/#{g.BOARD}/", "/#{post.board}/"),
+      responseType: 'document'
       withCredentials: true
       onload:  -> DeleteLink.load  link, post, fileOnly, @response
       onerror: -> DeleteLink.error link
     ,
       form: $.formData form
-  load: (link, post, fileOnly, html) ->
-    tmpDoc = d.implementation.createHTMLDocument ''
-    tmpDoc.documentElement.innerHTML = html
-    if tmpDoc.title is '4chan - Banned' # Ban/warn check
+  load: (link, post, fileOnly, resDoc) ->
+    if resDoc.title is '4chan - Banned' # Ban/warn check
       s = 'Banned!'
-    else if msg = tmpDoc.getElementById 'errmsg' # error!
+    else if msg = resDoc.getElementById 'errmsg' # error!
       s = msg.textContent
       $.on link, 'click', DeleteLink.delete
     else
-      if tmpDoc.title is 'Updating index...'
+      if resDoc.title is 'Updating index...'
         # We're 100% sure.
         (post.origin or post).kill fileOnly
       s = 'Deleted'

src/Posting/QR.coffee

@@ -960,6 +960,7 @@ QR =
       recaptcha_response_field:  response
 
     options =
+      responseType: 'document'
       withCredentials: true
       onload: QR.response
       onerror: ->
@@ -1002,20 +1003,23 @@ QR =
     post = QR.posts[0]
     post.unlock()
 
-    tmpDoc = d.implementation.createHTMLDocument ''
-    tmpDoc.documentElement.innerHTML = req.response
-    if ban  = $ '.banType', tmpDoc # banned/warning
-      board = $('.board', tmpDoc).innerHTML
+    resDoc  = req.response
+    if ban  = $ '.banType', resDoc # banned/warning
+      board = $('.board', resDoc).innerHTML
       err   = $.el 'span', innerHTML:
         if ban.textContent.toLowerCase() is 'banned'
-          "You are banned on #{board}! ;_;<br>" +
-          "Click <a href=//www.4chan.org/banned target=_blank>here</a> to see the reason."
+          """
+          You are banned on #{board}! ;_;<br>
+          Click <a href=//www.4chan.org/banned target=_blank>here</a> to see the reason.
+          """
         else
-          "You were issued a warning on #{board} as #{$('.nameBlock', tmpDoc).innerHTML}.<br>" +
-          "Reason: #{$('.reason', tmpDoc).innerHTML}"
-    else if err = tmpDoc.getElementById 'errmsg' # error!
+          """
+          You were issued a warning on #{board} as #{$('.nameBlock', resDoc).innerHTML}.<br>
+          Reason: #{$('.reason', resDoc).innerHTML}
+          """
+    else if err = resDoc.getElementById 'errmsg' # error!
       $('a', err)?.target = '_blank' # duplicate image link
-    else if tmpDoc.title isnt 'Post successful!'
+    else if resDoc.title isnt 'Post successful!'
       err = 'Connection error with sys.4chan.org.'
     else if req.status isnt 200
       err = "Error #{req.statusText} (#{req.status})"
@@ -1049,7 +1053,7 @@ QR =
       QR.error err
       return
 
-    h1 = $ 'h1', tmpDoc
+    h1 = $ 'h1', resDoc
     QR.cleanNotifications()
     QR.notifications.push new Notification 'success', h1.textContent, 5