diff --git a/docs/JAVASCRIPT.rst b/docs/JAVASCRIPT.rst
new file mode 100644
index 0000000..da7c1c0
--- /dev/null
+++ b/docs/JAVASCRIPT.rst
@@ -0,0 +1,205 @@
+JavaScript Usage in Remarkbox
+=============================
+
+This document catalogs all JavaScript usage in the Remarkbox codebase.
+
+Standalone JavaScript Files
+---------------------------
+
+remarkbox/static/js/custom.js
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Main application JavaScript containing core functionality. No external
+dependencies (jQuery was removed).
+
+**previewAjax()** (Lines 5-20)
+    Debounced preview function with 800ms timer. Escapes HTML in raw mode
+    to prevent XSS, then calls sendPreview().
+
+**sendPreview()** (Lines 22-41)
+    Fetch request to ``/preview-post`` endpoint for Markdown rendering.
+    Includes ``X-Requested-With: XMLHttpRequest`` header required by server.
+    Optionally triggers MathJax re-rendering.
+
+**toggle()** (Lines 43-66)
+    CSS-based toggle animation. Adds/removes ``toggle-open`` and
+    ``toggle-closing`` classes. Updates button text after 800ms animation.
+    Triggers textarea auto-grow on open if content exists.
+
+**Details close animation** (Lines 68-83)
+    Event listener for ``.preview-toggle`` clicks. Animates ``<details>``
+    element closure over 800ms using ``closing`` class.
+
+**autoGrow()** (Lines 85-89)
+    Auto-grows textarea height based on content, capped at 400px.
+
+**Document ready handler** (Lines 91-130)
+    - Binds input handlers for textarea auto-grow
+    - Binds vote-up/vote-down button click handlers
+    - Fades in alert elements over 2 seconds
+    - Highlights URL fragment targets with ``focused`` class
+
+**sendVote()** (Lines 132-151)
+    Fetch request to ``/vote-post`` endpoint. Updates vote count on success.
+
+remarkbox/static/js/iframe-resizer/
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+External library for responsive iframe sizing in embed mode.
+
+- ``iframeResizer.min.js`` - Main resizer script
+- ``iframeResizer.contentWindow.min.js`` - Content window script
+
+
+Inline JavaScript in Templates
+------------------------------
+
+Form Submission Protection
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Pattern: ``onsubmit="submit.disabled = true; return true;"``
+
+Disables submit button to prevent double submission. Used in:
+
+- ``snippets/forms.j2`` - Reply, edit, pay-what-you-can forms
+- ``snippets/create.j2`` - Thread creation form
+- ``snippets/snippets.j2`` - Watch, unwatch, lock, unlock, disable, enable, verify, approve, deny forms
+- ``snippets/search.j2`` - Search form
+- ``join-or-log-in.j2`` - Login form
+- ``setup-namespace.j2`` - Namespace setup/cancel forms
+- ``namespace-settings.j2`` - Settings forms
+- ``user-settings.j2`` - User settings form
+- ``user-watching.j2`` - Watching management form
+
+Live Markdown Preview
+~~~~~~~~~~~~~~~~~~~~~
+
+Pattern: ``onkeyup="previewAjax(...)"``
+
+Triggers debounced Markdown preview on textarea input.
+
+**snippets/forms.j2** (Line 21)
+    Reply textarea with raw preview::
+
+        previewAjax('textarea-{{ node.id }}', 'preview-{{ node.id }}', true, {{ request.mathjax }})
+
+**snippets/forms.j2** (Line 63)
+    Edit textarea without raw preview::
+
+        previewAjax('edit-textarea-{{ node.id }}', 'node-data-{{ node.id }}', false, {{ request.mathjax }})
+
+**snippets/create.j2** (Line 14)
+    Thread creation textarea::
+
+        previewAjax('thread_data_textarea', 'preview', true, {{ request.mathjax }})
+
+Toggle Functionality
+~~~~~~~~~~~~~~~~~~~~
+
+**base.j2** (Line 38)
+    Namespace switcher menu::
+
+        onclick="toggle('my-namespaces-div', 'my-namespaces-link', '(switch)', '(switch)'); return false;"
+
+**snippets/snippets.j2** (Line 88)
+    Remark button - shows reply form and focuses textarea::
+
+        onclick="toggle('remark-box-{{ node.id }}', 'remark-link-{{ node.id }}', 'remark', 'hide'); document.getElementById('textarea-{{ node.id }}').focus(); return false;"
+
+**snippets/snippets.j2** (Line 103)
+    Collapse button - hides/shows child nodes::
+
+        onclick="toggle('node-children-{{ node.id }}', 'collapse-link-{{ node.id }}', 'expand [+]', 'collapse [-]');"
+
+**snippets/snippets.j2** (Line 214)
+    Edit button - shows edit form and focuses textarea::
+
+        onclick="toggle('edit-box-{{ node.id }}', 'edit-link-{{ node.id }}', 'edit', 'hide'); document.getElementById('edit-textarea-{{ node.id }}').focus(); return false;"
+
+Alert Dismissal
+~~~~~~~~~~~~~~~
+
+**snippets/flash-alerts.j2** (Line 4)
+    Click to dismiss alert::
+
+        onclick="this.style.display='none'"
+
+Theme Preview
+~~~~~~~~~~~~~
+
+**user-settings.j2** (Lines 56-60)
+    Radio buttons for theme mode::
+
+        onchange="previewTheme(this.value)"
+
+**user-settings.j2** (Lines 108-127)
+    Theme preview function - applies ``dark-mode`` class to HTML element.
+
+
+External Scripts
+----------------
+
+snippets/javascript-includes.j2
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+**CSRF Token** (Line 6)
+    Global variable for AJAX requests::
+
+        var csrf_token = "{{ request.session.get_csrf_token() }}";
+
+**Google Analytics v4** (Lines 10-18)
+    Conditional loading based on namespace configuration (gtag.js).
+
+**MathJax** (Lines 20-27)
+    Mathematical formula rendering. Loaded from CDN when enabled.
+
+embed-iframe.txt.j2
+~~~~~~~~~~~~~~~~~~~
+
+Embed script (Lines 8-42) that:
+
+1. Captures parent page URL, title, and fragment
+2. Creates Remarkbox iframe with configuration
+3. Initializes iframe-resizer for responsive sizing
+
+snippets/stripe.j2
+~~~~~~~~~~~~~~~~~~
+
+**Stripe v3** (Line 57)
+    Payment processing library from ``https://js.stripe.com/v3/``
+
+**Payment form handling** (Lines 83-132)
+    Stripe card element initialization, validation, and token creation.
+
+
+CSS Classes Managed by JavaScript
+---------------------------------
+
+- ``toggle-open`` - Element is visible with open animation
+- ``toggle-closing`` - Element is animating closed
+- ``closing`` - Details element is animating closed
+- ``focused`` - URL fragment target highlighting
+- ``dark-mode`` - Dark theme applied to HTML element
+
+
+No-JavaScript Fallback
+----------------------
+
+Remarkbox functions without JavaScript:
+
+- Toggle links have ``href`` attributes pointing to dedicated pages
+  (e.g., ``/{node_id}/edit``, ``/{node_id}/reply``)
+- Forms submit normally without AJAX
+- ``<details>`` elements work natively for preview toggle
+- Textareas remain fixed size (no auto-grow)
+- Voting requires JavaScript (AJAX-only)
+
+
+Removed Dependencies
+--------------------
+
+The following were removed to reduce bundle size:
+
+- **jQuery 2.1.3** (84KB) - Replaced with vanilla JS (fetch, addEventListener, querySelectorAll)
+- **Legacy Google Analytics** (ga.js) - Using gtag v4 instead
+- **IE8 polyfills** - IE8 is no longer supported
diff --git a/remarkbox/static/css/common.css b/remarkbox/static/css/common.css
index ebc86be..90c44f0 100644
--- a/remarkbox/static/css/common.css
+++ b/remarkbox/static/css/common.css
@@ -417,29 +417,106 @@ form.node-action {
 
 .remark-box-div {
   display: none;
-  /* this is needed to prevent "jumping" jquery bug. */
   overflow: hidden;
   margin-top: 10px;
 }
 
 .edit-box-div {
   display: none;
-  /* this is needed to prevent "jumping" jquery bug. */
   overflow: hidden;
   margin-top: 15px;
 }
 
+/* CSS animation when toggled open via JS */
+.remark-box-div.toggle-open,
+.edit-box-div.toggle-open {
+  display: block;
+  overflow: hidden;
+  max-height: 1000px;
+  animation: slideDown 0.8s ease-out forwards;
+}
+
+.remark-box-div.toggle-closing,
+.edit-box-div.toggle-closing {
+  display: block;
+  max-height: 1000px;
+  animation: slideUp 0.8s ease-out forwards;
+}
+
+@keyframes slideDown {
+  from {
+    max-height: 0;
+  }
+  to {
+    max-height: 1000px;
+  }
+}
+
 .my-namespaces-div {
   display: none;
   position: absolute;
   background-color: #ffffff;
   z-index: 1;
-  /* this is needed to prevent "jumping" jquery bug. */
   overflow: hidden;
   padding-top: 10px;
   padding-bottom: 10px;
 }
 
+.my-namespaces-div.toggle-open {
+  display: block;
+  animation: slideDown 0.8s ease-out;
+}
+
+/* Preview toggle with CSS animation */
+.preview-details {
+  overflow: hidden;
+}
+
+.preview-details[open] > .preview {
+  overflow: hidden;
+  animation: slideDown 0.8s ease-out forwards;
+}
+
+.preview-details.closing > .preview {
+  overflow: hidden;
+  max-height: 1000px;
+  animation: slideUp 0.8s ease-out forwards;
+}
+
+@keyframes slideUp {
+  from {
+    max-height: 1000px;
+  }
+  to {
+    max-height: 0;
+  }
+}
+
+.preview-toggle {
+  cursor: pointer;
+  list-style: none;
+}
+
+.preview-toggle::-webkit-details-marker {
+  display: none;
+}
+
+.preview-toggle .when-open {
+  display: inline;
+}
+
+.preview-toggle .when-closed {
+  display: none;
+}
+
+.preview-details:not([open]) .when-open {
+  display: none;
+}
+
+.preview-details:not([open]) .when-closed {
+  display: inline;
+}
+
 #remarkbox-footer {
   font-size: 0.8em;
   font-weight: bold;
@@ -475,9 +552,10 @@ form.node-action {
 }
 
 .common-textarea {
-  min-height: calc(2rem * var(--line-height));
-  height: calc(5rem * var(--line-height));
+  min-height: calc(3rem * var(--line-height));
+  max-height: 400px;
   resize: vertical;
+  overflow-y: auto;
 }
 
 .monospace {
diff --git a/remarkbox/static/js/custom.js b/remarkbox/static/js/custom.js
index ab28d8a..67d4ef5 100644
--- a/remarkbox/static/js/custom.js
+++ b/remarkbox/static/js/custom.js
@@ -2,92 +2,156 @@
 // previewTimer must live outside the functions.
 var previewTimer = null;
 
-function previewAjax(textarea, div, show_raw = false, mathjax = false){
+function previewAjax(textarea, div, show_raw, mathjax) {
     // set div to raw textarea while waiting for remote Markdown rendering.
     if (show_raw) {
-	// bust HTML tags like <script> to prevent running evil code.
-        var busted_textarea = $('#'+textarea).val().replace(/&/g, '&amp;').replace(/</g,'&lt;');
-        // $('#' + div).html('<div class="preview-raw-markdown">'+busted_textarea+'</div>');
-        $('#' + div).html('<span class="preview-raw-markdown">'+busted_textarea+'</span>');
+        // bust HTML tags like <script> to prevent running evil code.
+        var el = document.getElementById(textarea);
+        var busted_textarea = el.value.replace(/&/g, '&amp;').replace(/</g, '&lt;');
+        document.getElementById(div).innerHTML = '<span class="preview-raw-markdown">' + busted_textarea + '</span>';
     }
     if (previewTimer) {
         clearTimeout(previewTimer);
     }
     previewTimer = setTimeout(
-        function() { sendPreview( textarea, div, mathjax ); },
-	800
+        function() { sendPreview(textarea, div, mathjax); },
+        800
     );
 }
 
-function sendPreview(textarea, div, mathjax=false){
-    $.ajaxSetup ({
-        cache: false
+function sendPreview(textarea, div, mathjax) {
+    var url = '/preview-post';
+    var data = new FormData();
+    data.append('data', document.getElementById(textarea).value);
+    data.append('csrf_token', csrf_token);
+
+    fetch(url, {
+        method: 'POST',
+        body: data,
+        headers: { 'X-Requested-With': 'XMLHttpRequest' }
+    })
+    .then(function(response) { return response.text(); })
+    .then(function(html) {
+        document.getElementById(div).innerHTML = html;
+        if (mathjax && typeof MathJax !== 'undefined') {
+            setTimeout(function() {
+                MathJax.Hub.Queue(["Typeset", MathJax.Hub, div]);
+            }, 100);
+        }
+    });
+}
+
+// CSS-based toggle for smoother animations.
+function toggle(target, button, off_text, on_text) {
+    if (typeof on_text === 'undefined') on_text = 'hide';
+    var el = document.getElementById(target);
+    var btn = document.getElementById(button);
+    if (el.classList.contains('toggle-open')) {
+        // Animate close, then update text
+        el.classList.add('toggle-closing');
+        setTimeout(function() {
+            el.classList.remove('toggle-open');
+            el.classList.remove('toggle-closing');
+            btn.textContent = off_text;
+        }, 800);
+    } else {
+        // Update text immediately when opening
+        btn.textContent = on_text;
+        el.classList.add('toggle-open');
+        // Auto-grow any textareas that have content
+        var textarea = el.querySelector('.common-textarea');
+        if (textarea && textarea.value) {
+            setTimeout(function() { autoGrow(textarea); }, 10);
+        }
+    }
+}
+
+// Animate <details> close for preview-details elements.
+if (typeof document.addEventListener === 'function') {
+    document.addEventListener('click', function(e) {
+        var summary = e.target.closest('.preview-toggle');
+        if (!summary) return;
+        var details = summary.parentElement;
+        if (!details || !details.classList.contains('preview-details')) return;
+        if (details.open && !details.classList.contains('closing')) {
+            e.preventDefault();
+            details.classList.add('closing');
+            setTimeout(function() {
+                details.open = false;
+                details.classList.remove('closing');
+            }, 800);
+        }
+    }, true);
+}
+
+// Auto-grow textarea as content is added
+function autoGrow(el) {
+    el.style.height = 'auto';
+    var newHeight = Math.min(el.scrollHeight, 400);
+    el.style.height = newHeight + 'px';
+}
+
+// Initialize on DOM ready
+document.addEventListener('DOMContentLoaded', function() {
+
+    // Auto-grow textareas on input
+    document.querySelectorAll('.common-textarea').forEach(function(textarea) {
+        textarea.addEventListener('input', function() {
+            autoGrow(this);
+        });
     });
 
-    var url    = '/preview-post';
-    var params = { 'data' : $('#'+textarea).val(), 'csrf_token' : csrf_token };
+    // Vote button handlers
+    document.querySelectorAll('button.vote-up').forEach(function(btn) {
+        btn.addEventListener('click', function() {
+            var post_id = this.closest('div').id;
+            sendVote(post_id, 'up');
+        });
+    });
 
-    $( '#' + div ).load( url, params );
+    document.querySelectorAll('button.vote-down').forEach(function(btn) {
+        btn.addEventListener('click', function() {
+            var post_id = this.closest('div').id;
+            sendVote(post_id, 'down');
+        });
+    });
 
-    if (mathjax) {
-        setTimeout(function(){
-            // hack: block MathJax rerender for 50ms, give div chance to load.
-            MathJax.Hub.Queue(["Typeset",MathJax.Hub,div]);
+    // Fade in alert elements
+    document.querySelectorAll('.alert').forEach(function(el) {
+        setTimeout(function() {
+            el.style.transition = 'opacity 2s';
+            el.style.opacity = '1';
         }, 100);
+    });
+
+    // Highlight fragment hash div if it exists
+    if (window.location.hash) {
+        var fragment = document.getElementById('node-data-' + window.location.hash.replace('#', ''));
+        if (fragment) {
+            fragment.classList.add('focused');
+        }
     }
-}
-
-// this toggles a dropdown.
-function toggle(target, button, off_text, on_text="hide"){
-    if (!$('#' + target + ":visible").height()){
-        $('#' + target).slideDown("slow");
-        $('#' + button).text(on_text);
-    }
-    else {
-        $('#' + target).slideUp("slow");
-        $('#' + button).text(off_text);
-    }
-}
-
-$(document).ready( function() {
-
-  $('button.vote-up').click(
-    function(){
-      var post_id = $(this).closest('div').attr('id');
-      sendVote( post_id, 'up' );
-    }
-  );
-
-  $('button.vote-down').click(
-    function(){
-      var post_id = $(this).closest('div').attr('id');
-      sendVote( post_id, 'down' );
-    }
-  );
-
-  // make all elements with class alert fade into existance.
-  $('.alert').delay(100).animate({"opacity": "1"}, 2000);
-
-  // highlight a fragment hash div if it exsits.
-  if(window.location.hash) {
-    // Fragment exists, so target the node's div.
-    var fragment = '#node-data-' + window.location.hash.replace('#', '');
-    $(fragment).addClass("focused");
-  }
 
 });
 
-function sendVote( post_id, direction ){
-  var url    = '/vote-post';
-  var params = { 'post_id' : post_id, 'direction' : direction, 'csrf_token' : csrf_token };
+function sendVote(post_id, direction) {
+    var url = '/vote-post';
+    var params = new URLSearchParams({
+        'post_id': post_id,
+        'direction': direction,
+        'csrf_token': csrf_token
+    });
 
-  $.getJSON( url, params, function( r ){
-      if ( r['status'] ) {
-        $('#'+post_id).children('b').html(r['vote_sum']);
-      }
-      else {
-        $('#json').html(r['msg']);
-      }
-    }
-  );
+    fetch(url + '?' + params.toString())
+    .then(function(response) { return response.json(); })
+    .then(function(r) {
+        if (r['status']) {
+            var el = document.getElementById(post_id);
+            var b = el.querySelector('b');
+            if (b) b.innerHTML = r['vote_sum'];
+        } else {
+            var jsonEl = document.getElementById('json');
+            if (jsonEl) jsonEl.innerHTML = r['msg'];
+        }
+    });
 }
diff --git a/remarkbox/static/js/iframe-resizer/ie8.polyfils.min.js b/remarkbox/static/js/iframe-resizer/ie8.polyfils.min.js
deleted file mode 100644
index 5836bac..0000000
--- a/remarkbox/static/js/iframe-resizer/ie8.polyfils.min.js
+++ /dev/null
@@ -1,4 +0,0 @@
-// IE8 polyfils for iframeResizer.js
-
-Array.prototype.forEach||(Array.prototype.forEach=function(a){"use strict";if(void 0===this||null===this||"function"!=typeof a)throw new TypeError;for(var b=Object(this),c=b.length>>>0,d=arguments.length>=2?arguments[1]:void 0,e=0;c>e;e++)e in b&&a.call(d,b[e],e,b)}),Function.prototype.bind||(Function.prototype.bind=function(a){if("function"!=typeof this)throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");var b=Array.prototype.slice.call(arguments,1),c=this,d=function(){},e=function(){return c.apply(this instanceof d?this:a,b.concat(Array.prototype.slice.call(arguments)))};return d.prototype=this.prototype,e.prototype=new d,e}),Array.prototype.forEach||(Array.prototype.forEach=function(a,b){if(null===this)throw new TypeError(" this is null or not defined");if("function"!=typeof a)throw new TypeError(a+" is not a function");for(var c=Object(this),d=c.length>>>0,e=0;d>e;e++)e in c&&a.call(b,c[e],e,c)});
-//# sourceMappingURL=ie8.polyfils.map
\ No newline at end of file
diff --git a/remarkbox/static/js/jquery-2.1.3.min.js b/remarkbox/static/js/jquery-2.1.3.min.js
deleted file mode 100644
index 25714ed..0000000
--- a/remarkbox/static/js/jquery-2.1.3.min.js
+++ /dev/null
@@ -1,4 +0,0 @@
-/*! jQuery v2.1.3 | (c) 2005, 2014 jQuery Foundation, Inc. | jquery.org/license */
-!function(a,b){"object"==typeof module&&"object"==typeof module.exports?module.exports=a.document?b(a,!0):function(a){if(!a.document)throw new Error("jQuery requires a window with a document");return b(a)}:b(a)}("undefined"!=typeof window?window:this,function(a,b){var c=[],d=c.slice,e=c.concat,f=c.push,g=c.indexOf,h={},i=h.toString,j=h.hasOwnProperty,k={},l=a.document,m="2.1.3",n=function(a,b){return new n.fn.init(a,b)},o=/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,p=/^-ms-/,q=/-([\da-z])/gi,r=function(a,b){return b.toUpperCase()};n.fn=n.prototype={jquery:m,constructor:n,selector:"",length:0,toArray:function(){return d.call(this)},get:function(a){return null!=a?0>a?this[a+this.length]:this[a]:d.call(this)},pushStack:function(a){var b=n.merge(this.constructor(),a);return b.prevObject=this,b.context=this.context,b},each:function(a,b){return n.each(this,a,b)},map:function(a){return this.pushStack(n.map(this,function(b,c){return a.call(b,c,b)}))},slice:function(){return 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diff --git a/remarkbox/templates/snippets/forms.j2 b/remarkbox/templates/snippets/forms.j2
index 1c65b95..555f6ad 100644
--- a/remarkbox/templates/snippets/forms.j2
+++ b/remarkbox/templates/snippets/forms.j2
@@ -26,8 +26,8 @@
   {% set submit_button_value = 'save message' %}
   {% include 'submit.j2' %}
 
-  <details open>
-  <summary class="action link" float="right">hide preview</summary>
+  <details class="preview-details" open>
+  <summary class="action link preview-toggle"><span class="when-open">hide preview ▲</span><span class="when-closed">show preview ▼</span></summary>
   <div id='preview-{{ node.id }}' name='preview' class='preview js-only'></div>
   </details>
 
diff --git a/remarkbox/templates/snippets/google-analytics.j2 b/remarkbox/templates/snippets/google-analytics.j2
deleted file mode 100644
index 610e2e3..0000000
--- a/remarkbox/templates/snippets/google-analytics.j2
+++ /dev/null
@@ -1,12 +0,0 @@
-{% if 'google-analytics-id' in request.app %}
-<script>
-  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-  })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-
-  ga('create', '{{ request.app['google-analytics-id'] }}', 'auto');
-  ga('send', 'pageview');
-
-</script>
-{% endif %}
diff --git a/remarkbox/templates/snippets/javascript-includes.j2 b/remarkbox/templates/snippets/javascript-includes.j2
index 4dd19bb..2514a75 100644
--- a/remarkbox/templates/snippets/javascript-includes.j2
+++ b/remarkbox/templates/snippets/javascript-includes.j2
@@ -5,7 +5,6 @@
   <!-- this is needed for async javascript requests -->
   <script>var csrf_token = "{{ request.session.get_csrf_token() | default("none", true) }}";</script>
 
-  <script src="/static/js/jquery-2.1.3.min.js"></script>
   <script src="/static/js/iframe-resizer/iframeResizer.contentWindow.min.js"></script>
   <script src="/static/js/custom.js"></script>
 {%- if request.mode == "basic" and request.namespace and request.namespace.name == request.domain and request.namespace.google_analytics_id %}
@@ -26,4 +25,3 @@
     src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-MML-AM_CHTML,Safe">
   </script>
 {%- endif %}
-{%- include 'google-analytics.j2' %}