diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..8c26d1a
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,12 @@
+language: ruby
+rvm:
+  - 2.3.3
+
+script:
+  - ./scripts/build
+  - ./scripts/test
+
+branches:
+  only:
+    - master
+    - /master-(.*)/ # test every branch which starts with "pages-"
diff --git a/Gemfile b/Gemfile
index 5202882..94c85fc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,6 +13,7 @@ gem "jekyll", "3.3.1"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 gem "minima", "~> 2.0"
+gem "html-proofer"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
diff --git a/Gemfile.lock b/Gemfile.lock
index 06b7f87..13f7258 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,11 +1,30 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (5.1.0)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
     addressable (2.5.0)
       public_suffix (~> 2.0, >= 2.0.2)
     colorator (1.1.0)
+    colored (1.2)
+    concurrent-ruby (1.0.5)
+    ethon (0.10.1)
+      ffi (>= 1.3.0)
     ffi (1.9.14)
     forwardable-extended (2.6.0)
+    html-proofer (3.6.0)
+      activesupport (>= 4.2, < 6.0)
+      addressable (~> 2.3)
+      colored (~> 1.2)
+      mercenary (~> 0.3.2)
+      nokogiri (~> 1.5)
+      parallel (~> 1.3)
+      typhoeus (~> 0.7)
+      yell (~> 2.0)
+    i18n (0.8.1)
     jekyll (3.3.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
@@ -29,8 +48,13 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     mercenary (0.3.6)
+    mini_portile2 (2.1.0)
     minima (2.1.0)
       jekyll (~> 3.3)
+    minitest (5.10.1)
+    nokogiri (1.7.1)
+      mini_portile2 (~> 2.1.0)
+    parallel (1.11.2)
     pathutil (0.14.0)
       forwardable-extended (~> 2.6)
     public_suffix (2.0.4)
@@ -40,11 +64,18 @@ GEM
     rouge (1.11.1)
     safe_yaml (1.0.4)
     sass (3.4.23)
+    thread_safe (0.3.6)
+    typhoeus (0.8.0)
+      ethon (>= 0.8.0)
+    tzinfo (1.2.3)
+      thread_safe (~> 0.1)
+    yell (2.0.7)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  html-proofer
   jekyll (= 3.3.1)
   jekyll-feed (~> 0.6)
   minima (~> 2.0)
diff --git a/_config.yml b/_config.yml
index 53c8a18..25c344a 100644
--- a/_config.yml
+++ b/_config.yml
@@ -33,6 +33,7 @@ gems:
 exclude:
   - Gemfile
   - Gemfile.lock
+  - vendor
 
 google_analytics: UA-57792488-6
 defaults:
diff --git a/scripts/build b/scripts/build
new file mode 100755
index 0000000..82f8038
--- /dev/null
+++ b/scripts/build
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+bundle exec jekyll build
diff --git a/scripts/test b/scripts/test
new file mode 100755
index 0000000..5a8754f
--- /dev/null
+++ b/scripts/test
@@ -0,0 +1 @@
+bundle exec htmlproofer ./_site