diff --git a/routes/_actions/contentWarnings.js b/routes/_actions/contentWarnings.js
new file mode 100644
index 0000000..e84fa15
--- /dev/null
+++ b/routes/_actions/contentWarnings.js
@@ -0,0 +1,6 @@
+import { store } from '../_store/store'
+
+export function toggleContentWarningShown (realm) {
+  let shown = store.getComposeData(realm, 'contentWarningShown')
+  store.setComposeData(realm, {contentWarningShown: !shown})
+}
diff --git a/routes/_components/compose/ComposeAuthor.html b/routes/_components/compose/ComposeAuthor.html
index 253a02b..2b71c79 100644
--- a/routes/_components/compose/ComposeAuthor.html
+++ b/routes/_components/compose/ComposeAuthor.html
@@ -12,7 +12,7 @@
   }
   .compose-box-display-name {
     color: var(--deemphasized-text-color);
-    grid-area: display-name;
+    grid-area: name;
     min-width: 0;
     white-space: nowrap;
     overflow: hidden;
diff --git a/routes/_components/compose/ComposeBox.html b/routes/_components/compose/ComposeBox.html
index 3b6825c..18a1101 100644
--- a/routes/_components/compose/ComposeBox.html
+++ b/routes/_components/compose/ComposeBox.html
@@ -1,8 +1,11 @@
 <div class="compose-box {{overLimit ? 'over-char-limit' : ''}}">
   <ComposeAuthor />
+  {{#if contentWarningShown}}
+    <ComposeContentWarning :realm :contentWarning />
+  {{/if}}
   <ComposeInput :realm :text />
   <ComposeLengthGauge :textLength :textOverLimit />
-  <ComposeToolbar :realm :postPrivacy :media />
+  <ComposeToolbar :realm :postPrivacy :media :contentWarningShown />
   <ComposeLengthIndicator :textLength :textOverLimit />
   <ComposeMedia :realm :media />
   <ComposeButton :textLength :textOverLimit />
@@ -14,12 +17,13 @@
     display: grid;
     align-items: flex-start;
     grid-template-areas:
-      "avatar display-name handle    handle"
-      "avatar input        input     input"
-      "avatar gauge        gauge     gauge"
-      "avatar toolbar      toolbar   length"
-      "avatar media        media     media"
-      "avatar button       button    button";
+      "avatar name       handle    handle"
+      "avatar cw         cw        cw"
+      "avatar input      input     input"
+      "avatar gauge      gauge     gauge"
+      "avatar toolbar    toolbar   length"
+      "avatar media      media     media"
+      "avatar button     button    button";
     grid-template-columns: min-content minmax(0, max-content) 1fr 1fr;
     border-bottom: 1px solid var(--main-border);
     width: 560px;
@@ -42,6 +46,7 @@
   import ComposeInput from './ComposeInput.html'
   import ComposeButton from './ComposeButton.html'
   import ComposeMedia from './ComposeMedia.html'
+  import ComposeContentWarning from './ComposeContentWarning.html'
   import { measureText } from '../../_utils/measureText'
   import { CHAR_LIMIT, POST_PRIVACY_OPTIONS } from '../../_static/statuses'
   import { store } from '../../_store/store'
@@ -54,7 +59,8 @@
       ComposeLengthIndicator,
       ComposeInput,
       ComposeButton,
-      ComposeMedia
+      ComposeMedia,
+      ComposeContentWarning
     },
     store: () => store,
     computed: {
@@ -65,7 +71,9 @@
       defaultPostPrivacyKey: ($currentVerifyCredentials) => $currentVerifyCredentials.source.privacy,
       postPrivacyKey: (composeData, defaultPostPrivacyKey) => composeData.postPrivacy || defaultPostPrivacyKey,
       textLength: (text) => measureText(text),
-      textOverLimit: (textLength) => textLength > CHAR_LIMIT
+      textOverLimit: (textLength) => textLength > CHAR_LIMIT,
+      contentWarningShown: (composeData) => composeData.contentWarningShown,
+      contentWarning: (composeData) => composeData.contentWarning || ''
     }
   }
 </script>
diff --git a/routes/_components/compose/ComposeContentWarning.html b/routes/_components/compose/ComposeContentWarning.html
new file mode 100644
index 0000000..c9642cd
--- /dev/null
+++ b/routes/_components/compose/ComposeContentWarning.html
@@ -0,0 +1,49 @@
+<input class="content-warning-input"
+       type="text"
+       placeholder="Content warning"
+       aria-label="Content warning"
+       bind:value=rawText
+/>
+<style>
+  .content-warning-input {
+    grid-area: cw;
+    font-size: 1.2em;
+    margin: 10px 0 0 5px;
+    padding: 10px;
+    border: 1px solid var(--input-border);
+    width: calc(100% - 5px);
+  }
+</style>
+<script>
+  import { store } from '../../_store/store'
+  import debounce from 'lodash/debounce'
+  import { scheduleIdleTask } from '../../_utils/scheduleIdleTask'
+
+  export default {
+    oncreate() {
+      this.setupSyncFromStore()
+      this.setupSyncToStore()
+    },
+    store: () => store,
+    data: () => ({
+      rawText: ''
+    }),
+    methods: {
+      setupSyncFromStore() {
+        this.observe('contentWarning', contentWarning => {
+          this.set({rawText: contentWarning})
+        })
+      },
+      setupSyncToStore() {
+        const saveText = debounce(() => scheduleIdleTask(() => this.store.save()), 1000)
+
+        this.observe('rawText', rawText => {
+          this.store.setComposeData(this.get('realm'), {
+            contentWarning: rawText
+          })
+          saveText()
+        }, {init: false})
+      }
+    }
+  }
+</script>
\ No newline at end of file
diff --git a/routes/_components/compose/ComposeToolbar.html b/routes/_components/compose/ComposeToolbar.html
index 1e669a5..d8ef1f2 100644
--- a/routes/_components/compose/ComposeToolbar.html
+++ b/routes/_components/compose/ComposeToolbar.html
@@ -17,8 +17,11 @@
     on:click="onPostPrivacyClick()"
   />
   <IconButton
-    label="Add content warning"
+    label="{{contentWarningShown ? 'Remove content warning' : 'Add content warning'}}"
     href="#fa-exclamation-triangle"
+    on:click="onContentWarningClick()"
+    pressable="true"
+    pressed="{{contentWarningShown}}"
   />
   <input ref:input
          on:change="onFileChange(event)"
@@ -40,7 +43,7 @@
   import { updateCustomEmojiForInstance } from '../../_actions/emoji'
   import { importDialogs } from '../../_utils/asyncModules'
   import { doMediaUpload } from '../../_actions/media'
-  import { POST_PRIVACY_OPTIONS } from '../../_static/statuses'
+  import { toggleContentWarningShown } from '../../_actions/contentWarnings'
 
   export default {
     oncreate() {
@@ -75,6 +78,9 @@
       async onPostPrivacyClick() {
         let dialogs = await importDialogs()
         dialogs.showPostPrivacyDialog(this.get('realm'))
+      },
+      onContentWarningClick() {
+        toggleContentWarningShown(this.get('realm'))
       }
     }
   }
diff --git a/tests/spec/13-compose-media.js b/tests/spec/13-compose-media.js
index 87a455f..31514e1 100644
--- a/tests/spec/13-compose-media.js
+++ b/tests/spec/13-compose-media.js
@@ -33,6 +33,7 @@ test('inserts media', async t => {
 test('removes media', async t => {
   await t.useRole(foobarRole)
   await (uploadKittenImage(1)())
+  await t.expect(getNthMedia(1).getAttribute('alt')).eql('kitten1.jpg')
   await (uploadKittenImage(2)())
   await t.expect(getNthMedia(1).getAttribute('alt')).eql('kitten1.jpg')
     .expect(getNthMedia(2).getAttribute('alt')).eql('kitten2.jpg')