diff --git a/assets/css/common/_blocks.scss b/assets/css/common/_blocks.scss
index d00ccd92..774ae23e 100644
--- a/assets/css/common/_blocks.scss
+++ b/assets/css/common/_blocks.scss
@@ -226,46 +226,3 @@ a.block__header--single-item, .block__header a {
 .block__content--top-border {
   border-top: $border;
 }
-
-.block__column__header {
-  font-size: 14px;
-  line-height: $block_header_sub_height;
-  margin-bottom: $header_field_spacing;
-  border-bottom: 1px solid;
-  font-weight: bold;
-}
-
-@media (min-width: $min_px_width_for_desktop_layout) {
-  .block--split {
-    display: flex;
-    flex-flow: row nowrap;
-    justify-content: space-between;
-  }
-
-  .block__column--full, .block__column--half {
-    flex-grow: 0;
-    flex-shrink: 0;
-    box-sizing: border-box;
-  }
-
-  .block__column--full {
-    flex-basis: 100%;
-  }
-
-  .block__column--half {
-    flex-basis: 50%;
-    max-width: 50%;
-
-    &:first-child {
-      padding-right: $block-spacing;
-    }
-    &:last-child {
-      padding-left: $block-spacing;
-    }
-
-    .flex__grow {
-      flex: 1;
-      min-width: 0;
-    }
-  }
-}
diff --git a/assets/css/views/_communications.scss b/assets/css/views/_communications.scss
index 7e410306..5809534f 100644
--- a/assets/css/views/_communications.scss
+++ b/assets/css/views/_communications.scss
@@ -51,7 +51,7 @@ span.communication__sender__stats,
   margin-left: 6px;
 }
 
-.communication-edit__wrap {
+.communication-edit__tab {
   padding-bottom: 12px;
 }
 
@@ -89,7 +89,7 @@ span.communication__sender__stats,
   }
 }
 
-.hyphenate-breaks {
+.hyphenate-breaks{
   hyphens: auto;
 }
 
diff --git a/assets/js/markdowntoolbar.js b/assets/js/markdowntoolbar.js
index 3992bdfa..0056f807 100644
--- a/assets/js/markdowntoolbar.js
+++ b/assets/js/markdowntoolbar.js
@@ -2,7 +2,7 @@
  * Markdown toolbar
  */
 
-import { $, $$, showEl } from './utils/dom';
+import { $, $$ } from './utils/dom';
 
 const markdownSyntax = {
   bold: {
@@ -22,8 +22,15 @@ const markdownSyntax = {
     options: { prefix: '||', shortcutKey: 's' }
   },
   code: {
-    action: wrapSelection,
-    options: { prefix: '`', shortcutKey: 'e' }
+    action: wrapSelectionOrLines,
+    options: {
+      prefix: '`',
+      suffix: '`',
+      prefixMultiline: '```\n',
+      suffixMultiline: '\n```',
+      singleWrap: true,
+      shortcutKey: 'e'
+    }
   },
   strike: {
     action: wrapSelection,
@@ -62,22 +69,31 @@ function getSelections(textarea, linesOnly = false) {
       trailingSpace =  '',
       caret;
 
-  if (linesOnly) {
+  const processLinesOnly = linesOnly instanceof RegExp ? linesOnly.test(selection) : linesOnly;
+  if (processLinesOnly) {
+    const explorer = /\n/g;
     let startNewlineIndex = 0,
         endNewlineIndex = textarea.value.length;
-    const explorer = /\n/g;
     while (explorer.exec(textarea.value)) {
       const { lastIndex } = explorer;
-      if (lastIndex < selectionStart) {
-        startNewlineIndex = lastIndex + 1;
+      if (lastIndex <= selectionStart) {
+        startNewlineIndex = lastIndex;
       }
       else if (lastIndex > selectionEnd) {
-        endNewlineIndex = lastIndex;
+        endNewlineIndex = lastIndex - 1;
         break;
       }
     }
 
     selectionStart = startNewlineIndex;
+    const startRemovedValue = textarea.value.substring(selectionStart);
+    const startsWithBlankString = startRemovedValue.match(/^[\s\n]+/);
+    if (startsWithBlankString) {
+      // Offset the selection start to the first non-blank line's first non-blank character, since
+      // Some browsers treat selection up to the start of the line as including the end of the
+      // previous line
+      selectionStart += startsWithBlankString[0].length;
+    }
     selectionEnd = endNewlineIndex;
     selection = textarea.value.substring(selectionStart, selectionEnd);
   }
@@ -98,6 +114,7 @@ function getSelections(textarea, linesOnly = false) {
   }
 
   return {
+    processLinesOnly,
     selectedText: selection,
     beforeSelection: textarea.value.substring(0, selectionStart) + leadingSpace,
     afterSelection: trailingSpace + textarea.value.substring(selectionEnd)
@@ -105,11 +122,11 @@ function getSelections(textarea, linesOnly = false) {
 }
 
 function transformSelection(textarea, transformer, eachLine) {
-  const { selectedText, beforeSelection, afterSelection } = getSelections(textarea, eachLine),
+  const { selectedText, beforeSelection, afterSelection, processLinesOnly } = getSelections(textarea, eachLine),
         // For long comments, record scrollbar position to restore it later
         { scrollTop } = textarea;
 
-  const { newText, caretOffset } = transformer(selectedText);
+  const { newText, caretOffset } = transformer(selectedText, processLinesOnly);
 
   textarea.value = beforeSelection + newText + afterSelection;
 
@@ -120,7 +137,8 @@ function transformSelection(textarea, transformer, eachLine) {
   textarea.selectionStart = newSelectionStart;
   textarea.selectionEnd = newSelectionStart;
   textarea.scrollTop = scrollTop;
-  textarea.dispatchEvent(new Event('keydown'));
+  // Needed for automatic textarea resizing
+  textarea.dispatchEvent(new Event('change'));
 }
 
 function insertLink(textarea, options) {
@@ -150,28 +168,31 @@ function wrapSelection(textarea, options) {
       });
     }
 
+    newText = prefix + newText + suffix
+
     return {
-      newText: prefix + newText + suffix,
-      caretOffset: emptyText ? prefix.length : 0
+      newText,
+      caretOffset: emptyText ? prefix.length : newText.length
     };
   });
 }
 
-function wrapLines(textarea, options) {
-  transformSelection(textarea, (selectedText) => {
-    const { text = selectedText, prefix = '', suffix = '' } = options,
+function wrapLines(textarea, options, eachLine = true) {
+  transformSelection(textarea, (selectedText, processLinesOnly) => {
+    const { text = selectedText, singleWrap = false } = options,
+          prefix = (processLinesOnly && options.prefixMultiline) || options.prefix || '',
+          suffix = (processLinesOnly && options.suffixMultiline) || options.suffix || '',
           emptyText = text === '';
-    let newText = prefix;
+    let newText = singleWrap
+      ? prefix + text.trim() + suffix
+      : text.split(/\n/g).map(line => prefix + line.trim() + suffix).join('\n');
 
-    if (!emptyText) {
-      newText = text.split(/\n/g).map(line => prefix + line.trim() + suffix).join('\n');
-    }
-    else {
-      newText += suffix;
-    }
+    return { newText, caretOffset: emptyText ? prefix.length : newText.length };
+  }, eachLine);
+}
 
-    return { newText, caretOffset: newText.length };
-  });
+function wrapSelectionOrLines(textarea, options) {
+  wrapLines(textarea, options, /\n/);
 }
 
 function escapeSelection(textarea, options) {
@@ -224,15 +245,6 @@ function setupToolbar() {
   $$('.js-toolbar-input').forEach(textarea => {
     textarea.addEventListener('keydown', shortcutHandler);
   });
-
-  // Transform non-JS basic editor to two-column layout with preview
-  $$('.js-preview-input-wrapper').forEach(wrapper => {
-    wrapper.classList.remove('block__column--full');
-    wrapper.classList.add('block__column--half');
-  });
-  $$('.js-preview-output-wrapper').forEach(wrapper => {
-    showEl(wrapper);
-  });
 }
 
 export { setupToolbar };
diff --git a/assets/js/preview.js b/assets/js/preview.js
index 93104b5a..757ef52b 100644
--- a/assets/js/preview.js
+++ b/assets/js/preview.js
@@ -4,7 +4,6 @@
 
 import { fetchJson } from './utils/requests';
 import { filterNode } from './imagesclientside';
-import { debounce } from './utils/events.js';
 import { hideEl, showEl } from './utils/dom.js';
 
 function handleError(response) {
@@ -37,39 +36,21 @@ function commentReply(user, url, textarea, quote) {
   textarea.focus();
 }
 
-/**
- * Stores the abort controller for the current preview request
- * @type {null|AbortController}
- */
-let previewAbortController = null;
-
-function getPreview(body, anonymous, previewLoading, previewContent) {
+function getPreview(body, anonymous, previewLoading, previewIdle, previewContent) {
   const path = '/posts/preview';
 
   if (typeof body !== 'string') return;
 
-  const trimmedBody = body.trim();
-  if (trimmedBody.length < 1) {
-    previewContent.innerHTML = '';
-    return;
-  }
-
   showEl(previewLoading);
+  hideEl(previewIdle);
 
-  // Abort previous requests if it exists
-  if (previewAbortController) previewAbortController.abort();
-  previewAbortController = new AbortController();
-
-  fetchJson('POST', path, { body, anonymous }, previewAbortController.signal)
+  fetchJson('POST', path, { body, anonymous })
     .then(handleError)
     .then(data => {
       previewContent.innerHTML = data;
       filterNode(previewContent);
-      showEl(previewContent);
+      showEl(previewIdle);
       hideEl(previewLoading);
-    })
-    .finally(() => {
-      previewAbortController = null;
     });
 }
 
@@ -99,34 +80,41 @@ function setupPreviews() {
     textarea = document.querySelector('.js-preview-description');
   }
 
-  const previewLoading = document.querySelector('.communication-preview__loading');
-  const previewContent = document.querySelector('.communication-preview__content');
+  const previewButton = document.querySelector('a[data-click-tab="preview"]');
+  const previewLoading = document.querySelector('.js-preview-loading');
+  const previewIdle = document.querySelector('.js-preview-idle');
+  const previewContent = document.querySelector('.js-preview-content');
   const previewAnon = document.querySelector('.js-preview-anonymous') || false;
 
   if (!textarea || !previewContent) {
     return;
   }
 
+  const getCacheKey = () => {
+    return (previewAnon && previewAnon.checked ? 'anon;' : '') + textarea.value;
+  }
+
+  const previewedTextAttribute = 'data-previewed-text';
   const updatePreview = () => {
-    getPreview(textarea.value, previewAnon && previewAnon.checked, previewLoading, previewContent);
+    const cachedValue = getCacheKey()
+    if (previewContent.getAttribute(previewedTextAttribute) === cachedValue) return;
+    previewContent.setAttribute(previewedTextAttribute, cachedValue);
+
+    getPreview(textarea.value, previewAnon && previewAnon.checked, previewLoading, previewIdle, previewContent);
   };
 
-  const debouncedUpdater = debounce(500, () => {
-    if (previewContent.previewedText === textarea.value) return;
-    previewContent.previewedText = textarea.value;
-
-    updatePreview();
-  });
-
-  textarea.addEventListener('keydown', debouncedUpdater);
-  textarea.addEventListener('focus', debouncedUpdater);
+  previewButton.addEventListener('click', updatePreview);
   textarea.addEventListener('change', resizeTextarea);
   textarea.addEventListener('keyup', resizeTextarea);
 
-  // Fire handler if textarea contains text on page load (e.g. editing)
-  if (textarea.value) textarea.dispatchEvent(new Event('keydown'));
+  // Fire handler for automatic resizing if textarea contains text on page load (e.g. editing)
+  if (textarea.value) textarea.dispatchEvent(new Event('change'));
 
-  previewAnon && previewAnon.addEventListener('click', updatePreview);
+  previewAnon && previewAnon.addEventListener('click', () => {
+    if (previewContent.classList.contains('hidden')) return;
+
+    updatePreview();
+  });
 
   document.addEventListener('click', event => {
     if (event.target && event.target.closest('.post-reply')) {
diff --git a/assets/js/utils/events.js b/assets/js/utils/events.js
index 606702c3..51c46a13 100644
--- a/assets/js/utils/events.js
+++ b/assets/js/utils/events.js
@@ -22,22 +22,3 @@ export function delegate(node, event, selectors) {
     }
   });
 }
-
-/**
- * Runs the provided `func` if it hasn't been called for at least `time` ms
- * @template {(...any[]) => any} T
- * @param {number} time
- * @param {T} func
- * @return {T}
- */
-export function debounce(time, func) {
-  let timerId = null;
-
-  return function(...args) {
-    // Cancels the setTimeout method execution
-    timerId && clearTimeout(timerId);
-
-    // Executes the func after delay time.
-    timerId = setTimeout(() => func(...args), time);
-  };
-}
diff --git a/assets/js/utils/requests.js b/assets/js/utils/requests.js
index ec232903..da0a1524 100644
--- a/assets/js/utils/requests.js
+++ b/assets/js/utils/requests.js
@@ -2,7 +2,7 @@
  * Request Utils
  */
 
-function fetchJson(verb, endpoint, body, signal) {
+function fetchJson(verb, endpoint, body) {
   const data = {
     method: verb,
     credentials: 'same-origin',
@@ -11,7 +11,6 @@ function fetchJson(verb, endpoint, body, signal) {
       'x-csrf-token': window.booru.csrfToken,
       'x-requested-with': 'xmlhttprequest'
     },
-    signal,
   };
 
   if (body) {
diff --git a/lib/philomena_web/templates/markdown/_input.html.slime b/lib/philomena_web/templates/markdown/_input.html.slime
index ad806cdb..96f10bb7 100644
--- a/lib/philomena_web/templates/markdown/_input.html.slime
+++ b/lib/philomena_web/templates/markdown/_input.html.slime
@@ -3,25 +3,22 @@
 - action_icon = assigns[:action_icon] || 'edit'
 - field_name = assigns[:name] || :body
 - field_placeholder = assigns[:placeholder] || "Your message"
-.block__content.block--split
-  .block__column--full.js-preview-input-wrapper
-    .block__column__header
-      i.fa> class="fa-#{action_icon}"
-      = action_text
+.block__header.block__header--js-tabbed
+  a.selected href="#" data-click-tab="write"
+    i.fa> class="fa-#{action_icon}"
+    = action_text
 
-    = render PhilomenaWeb.MarkdownView, "_help.html", conn: @conn
-    = render PhilomenaWeb.MarkdownView, "_toolbar.html", conn: @conn
+  a href="#" data-click-tab="preview"
+    i.fa.fa-cog.fa-fw.fa-spin.js-preview-loading.hidden> title=raw('Loading preview&hellip;')
+    i.fa.fa-eye.fa-fw.js-preview-idle>
+    | Preview
 
-    .field
-      = textarea form, field_name, class: "input input--wide input--text input--resize-vertical js-toolbar-input js-preview-input", placeholder: field_placeholder, required: true
-      = error_tag form, field_name
+.block__tab.communication-edit__tab.selected.js-preview-input-wrapper data-tab="write"
+  = render PhilomenaWeb.MarkdownView, "_help.html", conn: @conn
+  = render PhilomenaWeb.MarkdownView, "_toolbar.html", conn: @conn
 
-  .block__column--half.hidden.communication-preview.js-preview-output-wrapper
-    .block__column__header.flex.flex--spaced-out
-      span
-        i.fa.fa-eye>
-        ' Preview
-      span.communication-preview__loading.hidden
-        i.fa.fa-spin.fa-fw.fa-cog> title=raw('Loading preview&hellip;')
+  .field
+    = textarea form, field_name, class: "input input--wide input--text input--resize-vertical js-toolbar-input js-preview-input", placeholder: field_placeholder, required: true
+    = error_tag form, field_name
 
-    .communication-preview__content
+.block__tab.communication-edit__tab.hidden.js-preview-content data-tab="preview"