diff --git a/app/assets/javascripts/dispatcher.js b/app/assets/javascripts/dispatcher.js
index e4901f856476f724dceb9b0860350ffe6d036fa8..f4a30f7d39397898b4106e5e4f06406628f9a1da 100644
--- a/app/assets/javascripts/dispatcher.js
+++ b/app/assets/javascripts/dispatcher.js
@@ -187,7 +187,7 @@ import initSettingsPanels from './settings_panels';
         case 'groups:milestones:update':
           new ZenMode();
           new gl.DueDateSelectors();
-          new gl.GLForm($('.milestone-form'));
+          new gl.GLForm($('.milestone-form'), true);
           break;
         case 'projects:compare:show':
           new gl.Diff();
@@ -199,7 +199,7 @@ import initSettingsPanels from './settings_panels';
         case 'projects:issues:new':
         case 'projects:issues:edit':
           shortcut_handler = new ShortcutsNavigation();
-          new gl.GLForm($('.issue-form'));
+          new gl.GLForm($('.issue-form'), true);
           new IssuableForm($('.issue-form'));
           new LabelsSelect();
           new MilestoneSelect();
@@ -210,7 +210,7 @@ import initSettingsPanels from './settings_panels';
         case 'projects:merge_requests:edit':
           new gl.Diff();
           shortcut_handler = new ShortcutsNavigation();
-          new gl.GLForm($('.merge-request-form'));
+          new gl.GLForm($('.merge-request-form'), true);
           new IssuableForm($('.merge-request-form'));
           new LabelsSelect();
           new MilestoneSelect();
@@ -219,7 +219,7 @@ import initSettingsPanels from './settings_panels';
           break;
         case 'projects:tags:new':
           new ZenMode();
-          new gl.GLForm($('.tag-form'));
+          new gl.GLForm($('.tag-form'), true);
           new RefSelectDropdown($('.js-branch-select'), window.gl.availableRefs);
           break;
         case 'projects:snippets:new':
@@ -230,11 +230,11 @@ import initSettingsPanels from './settings_panels';
         case 'snippets:edit':
         case 'snippets:create':
         case 'snippets:update':
-          new gl.GLForm($('.snippet-form'));
+          new gl.GLForm($('.snippet-form'), false);
           break;
         case 'projects:releases:edit':
           new ZenMode();
-          new gl.GLForm($('.release-form'));
+          new gl.GLForm($('.release-form'), true);
           break;
         case 'projects:merge_requests:show':
           new gl.Diff();
@@ -482,7 +482,7 @@ import initSettingsPanels from './settings_panels';
               new gl.Wikis();
               shortcut_handler = new ShortcutsWiki();
               new ZenMode();
-              new gl.GLForm($('.wiki-form'));
+              new gl.GLForm($('.wiki-form'), true);
               break;
             case 'snippets':
               shortcut_handler = new ShortcutsNavigation();
diff --git a/spec/features/issues/form_spec.rb b/spec/features/issues/form_spec.rb
index 96d37e33f3d268519f166910ac3108c14c0ee06f..ebc4a19599ce4879279e9c1f1124b8b147876ce6 100644
--- a/spec/features/issues/form_spec.rb
+++ b/spec/features/issues/form_spec.rb
@@ -210,6 +210,13 @@ describe 'New/edit issue', :feature, :js do
 
       expect(find('.js-assignee-search')).to have_content(user2.name)
     end
+
+    it 'description has autocomplete' do
+      find('#issue_description').native.send_keys('')
+      fill_in 'issue_description', with: '@'
+
+      expect(page).to have_selector('.atwho-view')
+    end
   end
 
   context 'edit issue' do
@@ -258,6 +265,13 @@ describe 'New/edit issue', :feature, :js do
         end
       end
     end
+
+    it 'description has autocomplete' do
+      find('#issue_description').native.send_keys('')
+      fill_in 'issue_description', with: '@'
+
+      expect(page).to have_selector('.atwho-view')
+    end
   end
 
   describe 'sub-group project' do
diff --git a/spec/features/merge_requests/form_spec.rb b/spec/features/merge_requests/form_spec.rb
index 00ef1ffdddcb6ff7d571ad808fb7a1e352e141e9..486876d811d2b69e9c4495366840a1a7587a5d24 100644
--- a/spec/features/merge_requests/form_spec.rb
+++ b/spec/features/merge_requests/form_spec.rb
@@ -96,6 +96,13 @@ describe 'New/edit merge request', feature: true, js: true do
             .to end_with(merge_request_path(merge_request))
         end
       end
+
+      it 'description has autocomplete' do
+        find('#merge_request_description').native.send_keys('')
+        fill_in 'merge_request_description', with: '@'
+
+        expect(page).to have_selector('.atwho-view')
+      end
     end
 
     context 'edit merge request' do
@@ -157,6 +164,13 @@ describe 'New/edit merge request', feature: true, js: true do
           end
         end
       end
+
+      it 'description has autocomplete' do
+        find('#merge_request_description').native.send_keys('')
+        fill_in 'merge_request_description', with: '@'
+
+        expect(page).to have_selector('.atwho-view')
+      end
     end
   end
 
diff --git a/spec/features/projects/milestones/new_spec.rb b/spec/features/projects/milestones/new_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..7403822c7fbb5dfa1cd721bff44b9e4630783b5a
--- /dev/null
+++ b/spec/features/projects/milestones/new_spec.rb
@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+feature 'Creating a new project milestone', :feature, :js do
+  let(:user) { create(:user) }
+  let(:project) { create(:empty_project, name: 'test', namespace: user.namespace) }
+
+  before do
+    login_as(user)
+    visit new_namespace_project_milestone_path(project.namespace, project)
+  end
+
+  it 'description has autocomplete' do
+    find('#milestone_description').native.send_keys('')
+    fill_in 'milestone_description', with: '@'
+
+    expect(page).to have_selector('.atwho-view')
+  end
+end
diff --git a/spec/features/projects/wiki/user_creates_wiki_page_spec.rb b/spec/features/projects/wiki/user_creates_wiki_page_spec.rb
index 8912d5758785c9e67044681863a92d7562596de8..16e64bd6207864f74fccab4c8d6db1e71cec3643 100644
--- a/spec/features/projects/wiki/user_creates_wiki_page_spec.rb
+++ b/spec/features/projects/wiki/user_creates_wiki_page_spec.rb
@@ -133,6 +133,22 @@ feature 'Projects > Wiki > User creates wiki page', js: true, feature: true do
           expect(page).to have_content('My awesome wiki!')
         end
       end
+
+      scenario 'content has autocomplete', :js do
+        click_link 'New page'
+
+        page.within '#modal-new-wiki' do
+          fill_in :new_wiki_path, with: 'test-autocomplete'
+          click_button 'Create page'
+        end
+
+        page.within '.wiki-form' do
+          find('#wiki_content').native.send_keys('')
+          fill_in :wiki_content, with: '@'
+        end
+
+        expect(page).to have_selector('.atwho-view')
+      end
     end
   end
 
diff --git a/spec/features/projects/wiki/user_updates_wiki_page_spec.rb b/spec/features/projects/wiki/user_updates_wiki_page_spec.rb
index 86cf520ea80ecf634d3cb7f4264ad33ac5527c59..4d027a3ed1a267f3fcaf75bbdd2cf4728d481f3e 100644
--- a/spec/features/projects/wiki/user_updates_wiki_page_spec.rb
+++ b/spec/features/projects/wiki/user_updates_wiki_page_spec.rb
@@ -5,11 +5,10 @@ feature 'Projects > Wiki > User updates wiki page', feature: true do
 
   background do
     project.team << [user, :master]
+    WikiPages::CreateService.new(project, user, title: 'home', content: 'Home page').execute
     login_as(user)
 
-    visit namespace_project_path(project.namespace, project)
-    WikiPages::CreateService.new(project, user, title: 'home', content: 'Home page').execute
-    click_link 'Wiki'
+    visit namespace_project_wikis_path(project.namespace, project)
   end
 
   context 'in the user namespace' do
@@ -42,6 +41,15 @@ feature 'Projects > Wiki > User updates wiki page', feature: true do
         expect(page).to have_content('Content can\'t be blank')
         expect(find('textarea#wiki_content').value).to eq ''
       end
+
+      scenario 'content has autocomplete', :js do
+        click_link 'Edit'
+
+        find('#wiki_content').native.send_keys('')
+        fill_in :wiki_content, with: '@'
+
+        expect(page).to have_selector('.atwho-view')
+      end
     end
   end
 
diff --git a/spec/features/tags/master_creates_tag_spec.rb b/spec/features/tags/master_creates_tag_spec.rb
index af25eebed1395b62f0ad1fbd84a2b40dcd818090..9030a2f2ff52c2a11cbdc1b364d3ffd0bf99152c 100644
--- a/spec/features/tags/master_creates_tag_spec.rb
+++ b/spec/features/tags/master_creates_tag_spec.rb
@@ -7,61 +7,79 @@ feature 'Master creates tag', feature: true do
   before do
     project.team << [user, :master]
     login_with(user)
-    visit namespace_project_tags_path(project.namespace, project)
   end
 
-  scenario 'with an invalid name displays an error' do
-    create_tag_in_form(tag: 'v 1.0', ref: 'master')
+  context 'from tag list' do
+    before do
+      visit namespace_project_tags_path(project.namespace, project)
+    end
 
-    expect(page).to have_content 'Tag name invalid'
-  end
+    scenario 'with an invalid name displays an error' do
+      create_tag_in_form(tag: 'v 1.0', ref: 'master')
 
-  scenario 'with an invalid reference displays an error' do
-    create_tag_in_form(tag: 'v2.0', ref: 'foo')
+      expect(page).to have_content 'Tag name invalid'
+    end
 
-    expect(page).to have_content 'Target foo is invalid'
-  end
+    scenario 'with an invalid reference displays an error' do
+      create_tag_in_form(tag: 'v2.0', ref: 'foo')
 
-  scenario 'that already exists displays an error' do
-    create_tag_in_form(tag: 'v1.1.0', ref: 'master')
+      expect(page).to have_content 'Target foo is invalid'
+    end
 
-    expect(page).to have_content 'Tag v1.1.0 already exists'
-  end
+    scenario 'that already exists displays an error' do
+      create_tag_in_form(tag: 'v1.1.0', ref: 'master')
+
+      expect(page).to have_content 'Tag v1.1.0 already exists'
+    end
 
-  scenario 'with multiline message displays the message in a <pre> block' do
-    create_tag_in_form(tag: 'v3.0', ref: 'master', message: "Awesome tag message\n\n- hello\n- world")
+    scenario 'with multiline message displays the message in a <pre> block' do
+      create_tag_in_form(tag: 'v3.0', ref: 'master', message: "Awesome tag message\n\n- hello\n- world")
 
-    expect(current_path).to eq(
-      namespace_project_tag_path(project.namespace, project, 'v3.0'))
-    expect(page).to have_content 'v3.0'
-    page.within 'pre.wrap' do
-      expect(page).to have_content "Awesome tag message\n\n- hello\n- world"
+      expect(current_path).to eq(
+        namespace_project_tag_path(project.namespace, project, 'v3.0'))
+      expect(page).to have_content 'v3.0'
+      page.within 'pre.wrap' do
+        expect(page).to have_content "Awesome tag message\n\n- hello\n- world"
+      end
     end
-  end
 
-  scenario 'with multiline release notes parses the release note as Markdown' do
-    create_tag_in_form(tag: 'v4.0', ref: 'master', desc: "Awesome release notes\n\n- hello\n- world")
+    scenario 'with multiline release notes parses the release note as Markdown' do
+      create_tag_in_form(tag: 'v4.0', ref: 'master', desc: "Awesome release notes\n\n- hello\n- world")
 
-    expect(current_path).to eq(
-      namespace_project_tag_path(project.namespace, project, 'v4.0'))
-    expect(page).to have_content 'v4.0'
-    page.within '.description' do
-      expect(page).to have_content 'Awesome release notes'
-      expect(page).to have_selector('ul li', count: 2)
+      expect(current_path).to eq(
+        namespace_project_tag_path(project.namespace, project, 'v4.0'))
+      expect(page).to have_content 'v4.0'
+      page.within '.description' do
+        expect(page).to have_content 'Awesome release notes'
+        expect(page).to have_selector('ul li', count: 2)
+      end
+    end
+
+    scenario 'opens dropdown for ref', js: true do
+      click_link 'New tag'
+      ref_row = find('.form-group:nth-of-type(2) .col-sm-10')
+      page.within ref_row do
+        ref_input = find('[name="ref"]', visible: false)
+        expect(ref_input.value).to eq 'master'
+        expect(find('.dropdown-toggle-text')).to have_content 'master'
+
+        find('.js-branch-select').trigger('click')
+
+        expect(find('.dropdown-menu')).to have_content 'empty-branch'
+      end
     end
   end
 
-  scenario 'opens dropdown for ref', js: true do
-    click_link 'New tag'
-    ref_row = find('.form-group:nth-of-type(2) .col-sm-10')
-    page.within ref_row do
-      ref_input = find('[name="ref"]', visible: false)
-      expect(ref_input.value).to eq 'master'
-      expect(find('.dropdown-toggle-text')).to have_content 'master'
+  context 'from new tag page' do
+    before do
+      visit new_namespace_project_tag_path(project.namespace, project)
+    end
 
-      find('.js-branch-select').trigger('click')
+    it 'description has autocomplete', :js do
+      find('#release_description').native.send_keys('')
+      fill_in 'release_description', with: '@'
 
-      expect(find('.dropdown-menu')).to have_content 'empty-branch'
+      expect(page).to have_selector('.atwho-view')
     end
   end
 
diff --git a/spec/features/tags/master_updates_tag_spec.rb b/spec/features/tags/master_updates_tag_spec.rb
index 6b5b3122f725279c68ea2c779cbe0bf37914eecf..3582f41938a4e0ce210433b446aac51fba096180 100644
--- a/spec/features/tags/master_updates_tag_spec.rb
+++ b/spec/features/tags/master_updates_tag_spec.rb
@@ -24,6 +24,17 @@ feature 'Master updates tag', feature: true do
       expect(page).to have_content 'v1.1.0'
       expect(page).to have_content 'Awesome release notes'
     end
+
+    scenario 'description has autocomplete', :js do
+      page.within(first('.content-list .controls')) do
+        click_link 'Edit release notes'
+      end
+
+      find('#release_description').native.send_keys('')
+      fill_in 'release_description', with: '@'
+
+      expect(page).to have_selector('.atwho-view')
+    end
   end
 
   context 'from a specific tag page' do