diff --git a/plugin/Makefile b/plugin/Makefile
index 02c17a8..a5951e3 100644
--- a/plugin/Makefile
+++ b/plugin/Makefile
@@ -5,7 +5,8 @@ MODS :=		\
 	media_bbc	\
 	yt_nocookie	\
 	topic_mute	\
-	dragdrop_attach
+	dragdrop_attach	\
+	spoiler_bbc
 
 PKGDIR := $(PWD)/../packages
 
diff --git a/plugin/f9_theme/src/css/colors.css b/plugin/f9_theme/src/css/colors.css
index 618d59d..fc891ca 100644
--- a/plugin/f9_theme/src/css/colors.css
+++ b/plugin/f9_theme/src/css/colors.css
@@ -168,4 +168,13 @@
 	/* ajax notification bar */
 	--notify-bar-background: var(--main-background);
 	--notify-bar-color: #f96f00;
+
+	/* spoilers (requires spoilers_bbc) */
+	--spoiler-border: #757;
+	--spoiler-head-background: #dcd;
+	--spoiler-main-background: #fff9ff;
+
+	--noguest-border: #557;
+	--noguest-head-background: #dde;
+	--noguest-main-background: #f9f9ff;
 }
diff --git a/plugin/f9_theme/src/css/dark_colors.css b/plugin/f9_theme/src/css/dark_colors.css
index 8ff1a3f..8e309ca 100644
--- a/plugin/f9_theme/src/css/dark_colors.css
+++ b/plugin/f9_theme/src/css/dark_colors.css
@@ -66,4 +66,11 @@
 
 	--input-valid: #242;
 	--input-invalid: #422;
+
+	/* spoilers (requires spoilers_bbc) */
+	--spoiler-head-background: #3f2a3f;
+	--spoiler-main-background: #3a333a;
+
+	--noguest-head-background: #2a2a3f;
+	--noguest-main-background: #33333f;
 }
diff --git a/plugin/f9_theme/src/css/jquery.sceditor.default.css b/plugin/f9_theme/src/css/jquery.sceditor.default.css
index b7d019d..e700c7d 100644
--- a/plugin/f9_theme/src/css/jquery.sceditor.default.css
+++ b/plugin/f9_theme/src/css/jquery.sceditor.default.css
@@ -1,4 +1,6 @@
 /*! SCEditor | (C) 2011-2013, Sam Clarke | sceditor.com/license */
+@import url("../../default/css/spoiler_bbc.css");
+
 html, p, code::before, div, table {
 	margin: 0;
 	padding: 0;
diff --git a/plugin/spoiler_bbc/Makefile b/plugin/spoiler_bbc/Makefile
new file mode 100644
index 0000000..95f9fba
--- /dev/null
+++ b/plugin/spoiler_bbc/Makefile
@@ -0,0 +1,3 @@
+PROJECT := spoiler_bbc
+
+include ../plugin.mk
diff --git a/plugin/spoiler_bbc/src/Subs-SpoilerCode.php b/plugin/spoiler_bbc/src/Subs-SpoilerCode.php
new file mode 100644
index 0000000..c5265da
--- /dev/null
+++ b/plugin/spoiler_bbc/src/Subs-SpoilerCode.php
@@ -0,0 +1,66 @@
+<?php
+
+function hook_spoiler_bbcode(&$codes, &$no_autolink_tags) {
+    global $modSettings, $context, $user_info;
+    $codes[] = array(
+        'tag' => 'spoiler',
+        'before' => '<details class="collapsible spoiler"><summary>Spoiler</summary> <div>',
+        'after' => '</div></details>',
+        'block_level' => true,
+    );
+    $codes[] = array(
+        'tag' => 'spoiler',
+        'type' => 'parsed_equals',
+        'before' => '<details class="collapsible spoiler"><summary>$1</summary> <div>',
+        'after' => '</div></details>',
+        'block_level' => true,
+    );
+    $codes[] = array(
+        'tag' => 'noguest',
+        // 'parsed_content' works by writing 'before' when it encounters the
+        // beginning tag, and eventually replacing the end tag with 'after'. We
+        // need to "parse" the content to perform the is_guest validation,
+        // though! So our compromise is to not allow BBCode within [noguest].
+        //
+        // *Theoretically*, we could recursively call parse_bbc, but that is a
+        // can of worms I do not wish to open today.
+        'type' => 'unparsed_content',
+        'content' => '<details class="collapsible noguest" open><summary>Logged-in users only</summary><div>$1</div></details>',
+        'validate' => function(&$tag, &$data, $disabled, $params) use ($modSettings, $context, $user_info)
+        {
+            if ($user_info['is_guest']) {
+                $data = 'Sorry, this content is only available for logged-in users.';
+            }
+        },
+        'block_level' => true,
+    );
+}
+
+function hook_spoiler_bbcode_buttons(&$bbc_tags) {
+    $bbc_tags[] = array(
+        array(
+            'code' => 'spoiler',
+            'description' => 'Insert Spoiler block',
+        ),
+        array(
+            'code' => 'noguest',
+            'description' => 'Insert block for logged-in users only',
+        ),
+    );
+}
+
+function spoiler_sce_options(&$sce_options) {
+    loadJavaScriptFile('sceditor.spoilerbbc.js', array('minimize' => true), 'smf_sceditor_spoiler');
+    loadCSSFile('sceditor.spoilerbbc.css', array('minimize' => true));
+}
+
+function spoiler_bbc_credits() {
+    global $context;
+    $context['credits_modifications'][] = 'Silk SVG icons by <a href="https://github.com/frhun">@frhun</a>, licensed under CC-BY-SA';
+}
+
+function hook_spoiler_load_theme() {
+    loadCSSFile('spoiler_bbc.css', array('minimize' => true));
+}
+
+?>
diff --git a/plugin/spoiler_bbc/src/asset/icon_expand.svg b/plugin/spoiler_bbc/src/asset/icon_expand.svg
new file mode 100644
index 0000000..22fa64d
--- /dev/null
+++ b/plugin/spoiler_bbc/src/asset/icon_expand.svg
@@ -0,0 +1,175 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="31.999998"
+   height="31.999998"
+   viewBox="0 0 8.466666 8.466666"
+   version="1.1"
+   id="svg1"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1">
+    <linearGradient
+       id="linearGradient19">
+      <stop
+         style="stop-color:#b5bfc9;stop-opacity:0.76999998;"
+         offset="0"
+         id="stop20" />
+      <stop
+         style="stop-color:#cfd3d8;stop-opacity:0;"
+         offset="0.2510533"
+         id="stop22" />
+      <stop
+         style="stop-color:#ccd1d6;stop-opacity:0;"
+         offset="0.75"
+         id="stop23" />
+      <stop
+         style="stop-color:#c8d3da;stop-opacity:0.63999999;"
+         offset="1"
+         id="stop21" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient15">
+      <stop
+         style="stop-color:#cbd2d7;stop-opacity:0.75088906;"
+         offset="0"
+         id="stop16" />
+      <stop
+         style="stop-color:#e5e9eb;stop-opacity:1;"
+         offset="0.18264508"
+         id="stop18" />
+      <stop
+         style="stop-color:#cfd3d8;stop-opacity:1;"
+         offset="0.75229496"
+         id="stop19" />
+      <stop
+         style="stop-color:#bbc0c9;stop-opacity:1;"
+         offset="1"
+         id="stop17" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient8">
+      <stop
+         style="stop-color:#bec2c5;stop-opacity:0.60000002;"
+         offset="0"
+         id="stop8" />
+      <stop
+         style="stop-color:#e3e5e8;stop-opacity:0;"
+         offset="0.50365794"
+         id="stop10" />
+      <stop
+         style="stop-color:#e3e5e8;stop-opacity:0;"
+         offset="0.64754182"
+         id="stop11" />
+      <stop
+         style="stop-color:#d1d6db;stop-opacity:0.60000002;"
+         offset="1"
+         id="stop9" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient2">
+      <stop
+         style="stop-color:#a9b7c6;stop-opacity:1;"
+         offset="0"
+         id="stop2" />
+      <stop
+         style="stop-color:#cfd4d8;stop-opacity:1;"
+         offset="0.25"
+         id="stop5" />
+      <stop
+         style="stop-color:#cfd4d8;stop-opacity:1;"
+         offset="0.75"
+         id="stop4" />
+      <stop
+         style="stop-color:#c1c6cc;stop-opacity:1;"
+         offset="1"
+         id="stop3" />
+    </linearGradient>
+    <linearGradient
+       xlink:href="#linearGradient2"
+       id="linearGradient3"
+       x1="-7.1332073"
+       y1="-7.1332073"
+       x2="-1.3334589"
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+       id="linearGradient9"
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+       id="linearGradient17"
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+    <path
+       style="font-variation-settings:normal;fill:#000000;fill-opacity:1;stroke:#000000;stroke-width:0.687917;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;stop-color:#000000;stop-opacity:1"
+       d="M 2.1166666,4.2333333 H 6.3499999"
+       id="path2402" />
+  </g>
+  <g
+     id="layer2-6"
+     style="font-variation-settings:normal;vector-effect:none;fill:#000000;fill-opacity:1;stroke:#000000;stroke-width:0.79375;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000"
+     transform="rotate(90,4.2333333,4.233333)">
+    <path
+       style="font-variation-settings:normal;fill:#000000;fill-opacity:1;stroke:#000000;stroke-width:0.687917;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;stop-color:#000000;stop-opacity:1"
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+</svg>
diff --git a/plugin/spoiler_bbc/src/asset/icon_minimize.svg b/plugin/spoiler_bbc/src/asset/icon_minimize.svg
new file mode 100644
index 0000000..f66dd88
--- /dev/null
+++ b/plugin/spoiler_bbc/src/asset/icon_minimize.svg
@@ -0,0 +1,229 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="31.999998"
+   height="31.999998"
+   viewBox="0 0 8.466666 8.466666"
+   version="1.1"
+   id="svg1"
+   sodipodi:docname="icon_minimize.svg"
+   inkscape:version="1.4 (e7c3feb100, 2024-10-09)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#505050"
+     bordercolor="#eeeeee"
+     borderopacity="1"
+     inkscape:showpageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#505050"
+     inkscape:zoom="0.49856139"
+     inkscape:cx="-337.97242"
+     inkscape:cy="-312.90028"
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+     inkscape:window-height="1218"
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+     inkscape:window-y="0"
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+       inkscape:collect="always">
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+         offset="0.2510533"
+         id="stop22" />
+      <stop
+         style="stop-color:#ccd1d6;stop-opacity:0;"
+         offset="0.75"
+         id="stop23" />
+      <stop
+         style="stop-color:#a6b5c4;stop-opacity:0.63999999;"
+         offset="1"
+         id="stop21" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient15"
+       inkscape:collect="always">
+      <stop
+         style="stop-color:#aebac6;stop-opacity:1;"
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+         id="stop16" />
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+    <linearGradient
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+       id="path2402" />
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+</svg>
diff --git a/plugin/spoiler_bbc/src/asset/icon_page_shield.svg b/plugin/spoiler_bbc/src/asset/icon_page_shield.svg
new file mode 100644
index 0000000..cc57199
--- /dev/null
+++ b/plugin/spoiler_bbc/src/asset/icon_page_shield.svg
@@ -0,0 +1,191 @@
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+<svg
+   width="64"
+   height="64"
+   viewBox="0 0 64 64"
+   version="1.1"
+   id="svg8"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
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+     id="defs2">
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+       id="linearGradient914">
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+         offset="0"
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+      <stop
+         style="stop-color:#fcfcfc;stop-opacity:1"
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+         id="stop912" />
+    </linearGradient>
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+       id="linearGradient874">
+      <stop
+         style="stop-color:#000000;stop-opacity:0.21176471"
+         offset="0"
+         id="stop870" />
+      <stop
+         style="stop-color:#949494;stop-opacity:0.56862748"
+         offset="1"
+         id="stop872" />
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+       xlink:href="#linearGradient874"
+       id="linearGradient905"
+       gradientUnits="userSpaceOnUse"
+       x1="8"
+       y1="60"
+       x2="48"
+       y2="8" />
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+       xlink:href="#linearGradient914"
+       id="linearGradient916"
+       x1="44"
+       y1="16"
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+       y2="48"
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+    <linearGradient
+       id="linearGradient884">
+      <stop
+         style="stop-color:#fdf7df;stop-opacity:1"
+         offset="0"
+         id="stop880" />
+      <stop
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+         offset="0.47619048"
+         id="stop888" />
+      <stop
+         style="stop-color:#fdf7df;stop-opacity:1"
+         offset="1"
+         id="stop882" />
+    </linearGradient>
+    <linearGradient
+       xlink:href="#linearGradient876"
+       id="linearGradient878"
+       x1="48"
+       y1="52"
+       x2="16"
+       y2="8"
+       gradientUnits="userSpaceOnUse"
+       gradientTransform="matrix(0.75862238,0,0,0.75862238,18.482665,16.965424)" />
+    <linearGradient
+       id="linearGradient876">
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+         style="stop-color:#dc9f30;stop-opacity:1"
+         offset="0"
+         id="stop872-3" />
+      <stop
+         style="stop-color:#edc13f;stop-opacity:1"
+         offset="1"
+         id="stop874" />
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+    <linearGradient
+       xlink:href="#linearGradient939"
+       id="linearGradient927"
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+       y1="32"
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+    <linearGradient
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+         style="stop-color:#f6dc7d;stop-opacity:1"
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+         id="stop933" />
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+         offset="0.5"
+         id="stop935" />
+      <stop
+         style="stop-color:#eeac28;stop-opacity:1"
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+         id="stop937" />
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+       gradientUnits="userSpaceOnUse"
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+       y2="35.273148" />
+    <linearGradient
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+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
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+        <dc:title />
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+       id="path868" />
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+       id="path868-5"
+       style="fill:url(#linearGradient927);fill-opacity:1;stroke:none;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;paint-order:markers fill stroke"
+       d="m 10,12 a 6.0006,6.0006 0 0 1 1.535156,0.636719 c -0.01815,-0.01859 -0.02635,-0.112286 -0.04297,-0.128906 C 11.299378,12.315003 11,12 10,12 Z m 44,0 c -1,0 -1.299378,0.315003 -1.492188,0.507813 -0.01662,0.01662 -0.02482,0.110314 -0.04297,0.128906 A 6.0006,6.0006 0 0 1 54,12 Z M 8,14 c 0,1 0.3150035,1.299378 0.5078125,1.492188 0.036341,0.03634 0.2333341,0.05363 0.28125,0.0957 A 6.0006,6.0006 0 0 1 8,14 Z m 48,0 a 6.0006,6.0006 0 0 1 -0.791016,1.587891 c 0.04831,-0.04235 0.246637,-0.05914 0.283203,-0.0957 C 55.684997,15.299378 56,15 56,14 Z m -24.015625,0.01367 C 26.391489,17.792401 19.900296,18.646969 16,19.6875 V 36 c 0,-0.214286 2.153449,5.216881 6.039062,9.435547 3.212042,3.487359 7.101019,6.2687 9.960938,7.767578 2.859919,-1.498878 6.748896,-4.280219 9.960937,-7.767578 C 45.846551,41.216881 48,35.785714 48,36 V 19.673828 C 43.124933,18.319706 37.137158,17.465673 31.984375,14.013672 Z"
+       transform="matrix(0.75862237,0,0,0.75862237,18.482665,16.965423)" />
+    <path
+       id="path868-5-2"
+       style="fill:url(#linearGradient927-6);fill-opacity:1;stroke:none;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;paint-order:markers fill stroke"
+       d="m 10,12 a 6.0006,6.0006 0 0 1 1.535156,0.636719 c -0.01815,-0.01859 -0.02635,-0.112286 -0.04297,-0.128906 C 11.299378,12.315003 11,12 10,12 Z m 44,0 c -1,0 -1.299378,0.315003 -1.492188,0.507813 -0.01662,0.01662 -0.02482,0.110314 -0.04297,0.128906 A 6.0006,6.0006 0 0 1 54,12 Z M 8,14 c 0,1 0.3150035,1.299378 0.5078125,1.492188 0.036341,0.03634 0.2333341,0.05363 0.28125,0.0957 A 6.0006,6.0006 0 0 1 8,14 Z m 48,0 a 6.0006,6.0006 0 0 1 -0.791016,1.587891 c 0.04831,-0.04235 0.246637,-0.05914 0.283203,-0.0957 C 55.684997,15.299378 56,15 56,14 Z m -24.015625,0.01367 C 26.391489,17.792401 19.900296,18.646969 16,19.6875 V 36 c 0,-0.214286 2.153449,5.216881 6.039062,9.435547 3.212042,3.487359 7.101019,6.2687 9.960938,7.767578 2.859919,-1.498878 6.748896,-4.280219 9.960937,-7.767578 C 45.846551,41.216881 48,35.785714 48,36 V 19.673828 C 43.124933,18.319706 37.137158,17.465673 31.984375,14.013672 Z"
+       transform="matrix(0.75862237,0,0,0.75862237,18.482665,16.965423)" />
+  </g>
+</svg>
diff --git a/plugin/spoiler_bbc/src/asset/icon_page_warn.svg b/plugin/spoiler_bbc/src/asset/icon_page_warn.svg
new file mode 100644
index 0000000..dd1da12
--- /dev/null
+++ b/plugin/spoiler_bbc/src/asset/icon_page_warn.svg
@@ -0,0 +1 @@
+<?xml version='1.0' encoding='ASCII' standalone='yes'?><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" width="64" height="64" viewBox="0 0 64 64" version="1.1" id="svg8"><defs id="defs2"><linearGradient id="linearGradient914"><stop style="stop-color:#e9e9e9;stop-opacity:1" offset="0" id="stop910"/><stop style="stop-color:#fcfcfc;stop-opacity:1" offset="1" id="stop912"/></linearGradient><linearGradient id="linearGradient874"><stop style="stop-color:#000000;stop-opacity:0.21176471" offset="0" id="stop870"/><stop style="stop-color:#949494;stop-opacity:0.56862748" offset="1" id="stop872"/></linearGradient><linearGradient xlink:href="#linearGradient874" id="linearGradient905" gradientUnits="userSpaceOnUse" x1="8" y1="60" x2="48" y2="8"/><linearGradient xlink:href="#linearGradient914" id="linearGradient916" x1="44" y1="16" x2="20" y2="48" gradientUnits="userSpaceOnUse"/></defs><metadata id="metadata5"><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title/></cc:Work></rdf:RDF></metadata><g id="layer1"><path style="fill:none;stroke:url(#linearGradient905);stroke-width:12;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:markers fill stroke" d="M 10,6 V 58 H 54 V 18 L 48,12 42,6 Z" id="path868-7"/><path style="fill:#e9e9e9;fill-opacity:1;stroke:none;stroke-width:12;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:markers fill stroke" d="m 43,4 13,13 v 1 H 42 V 4 Z" id="path908"/><path style="fill:url(#linearGradient916);fill-opacity:1;stroke:#fcfcfc;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-opacity:1;paint-order:markers fill stroke" d="M 10,6 V 58 H 54 V 18 H 42 V 6 Z" id="path868"/></g><svg width="64" height="64" viewBox="0 0 64 64" version="1.1" id="svg8"><defs id="defs2"><linearGradient id="linearGradientKeyLayer1177"><stop style="stop-color:#e9bb3a;stop-opacity:0.9896782" offset="0" id="stop1173"/><stop style="stop-color:#c16803;stop-opacity:1" offset="1" id="stop1175"/></linearGradient><linearGradient xlink:href="#linearGradientKeyLayer1177" id="linearGradientKeyLayer1179" x1="20" y1="20" x2="36" y2="60" gradientUnits="userSpaceOnUse" gradientTransform="translate(20,4)"/></defs><metadata id="metadata5"><rdf:RDF><cc:Work rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/><dc:title/></cc:Work></rdf:RDF></metadata><g id="layer1"><path style="fill:#ffffff;fill-opacity:1;stroke:url(#linearGradientKeyLayer1179);stroke-width:8;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:stroke markers fill" d="M 24,60 H 60 L 42,28 Z" id="path1169"/><path style="fill:#f5d852;fill-opacity:1;stroke:none;stroke-width:8;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:markers fill stroke" d="M 28,58 H 56 L 42,33 Z" id="path1171"/><path style="fill:#c58711;fill-opacity:1;stroke:none;stroke-width:1;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:stroke markers fill" d="m 40,52 v 4 h 4 v -4 z" id="path1219"/><path style="fill:#c58711;fill-opacity:1;stroke:none;stroke-width:1;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:stroke markers fill" d="m 40,48 h 4 v -8 h -4 z" id="path1221"/></g></svg></svg>
\ No newline at end of file
diff --git a/plugin/spoiler_bbc/src/package-info.xml b/plugin/spoiler_bbc/src/package-info.xml
new file mode 100644
index 0000000..2f8efc1
--- /dev/null
+++ b/plugin/spoiler_bbc/src/package-info.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0"?>
+<!DOCTYPE package-info SYSTEM "http://www.simplemachines.org/xml/package-info">
+<package-info xmlns="http://www.simplemachines.org/xml/package-info" xmlns:smf="http://www.simplemachines.org/">
+    <id>@flurry:spoiler_bbc</id>
+    <name>Spoiler BBCode Tags</name>
+    <version>1.0</version>
+    <type>modification</type>
+
+    <install for="2.1.* - 2.1.99">
+        <readme parsebbc="true">readme.txt</readme>
+        <require-file name="Subs-SpoilerCode.php" destination="$sourcedir" />
+        <require-file name="sceditor.spoilerbbc.css" destination="Themes/default/css" />
+        <require-file name="spoiler_bbc.css" destination="Themes/default/css" />
+        <require-file name="sceditor.spoilerbbc.js" destination="Themes/default/scripts" />
+        <require-file name="asset/icon_page_shield.svg" destination="Themes/default/images" />
+        <require-file name="asset/icon_page_warn.svg" destination="Themes/default/images" />
+        <require-file name="asset/icon_minimize.svg" destination="Themes/default/images" />
+        <require-file name="asset/icon_expand.svg" destination="Themes/default/images" />
+        <hook hook="integrate_bbc_codes" function="hook_spoiler_bbcode" file="$sourcedir/Subs-SpoilerCode.php" />
+        <hook hook="integrate_bbc_buttons" function="hook_spoiler_bbcode_buttons" file="$sourcedir/Subs-SpoilerCode.php" />
+        <hook hook="integrate_sceditor_options" function="spoiler_sce_options" file="$sourcedir/Subs-SpoilerCode.php" />
+        <hook hook="integrate_credits" function="spoiler_bbc_credits" file="$sourcedir/Subs-SpoilerCode.php" />
+        <hook hook="integrate_load_theme" function="hook_spoiler_load_theme" file="$sourcedir/Subs-SpoilerCode.php" />
+    </install>
+
+    <uninstall for="2.1.* - 2.1.99">
+        <remove-file name="$sourcedir/Subs-SpoilerCode.php" />
+        <remove-file name="Themes/default/scripts/sceditor.spoilerbbc.js" />
+        <remove-file name="Themes/default/css/sceditor.spoilerbbc.css" />
+        <remove-file name="Themes/default/css/spoiler_bbc.css" />
+        <remove-file name="Themes/default/images/icon_page_shield.svg" />
+        <remove-file name="Themes/default/images/icon_page_warn.svg" />
+        <remove-file name="Themes/default/images/icon_minimize.svg" />
+        <remove-file name="Themes/default/images/icon_expand.svg" />
+        <hook hook="integrate_load_theme" function="hook_spoiler_load_theme" file="$sourcedir/Subs-SpoilerCode.php" reverse="true" />
+        <hook hook="integrate_bbc_codes" function="hook_spoiler_bbcode" file="$sourcedir/Subs-SpoilerCode.php" reverse="true" />
+        <hook hook="integrate_bbc_buttons" function="hook_spoiler_bbcode_buttons" file="$sourcedir/Subs-SpoilerCode.php" reverse="true" />
+        <hook hook="integrate_sceditor_options" function="spoiler_sce_options" file="$sourcedir/Subs-SpoilerCode.php" reverse="true" />
+        <hook hook="integrate_credits" function="spoiler_bbc_credits" file="$sourcedir/Subs-SpoilerCode.php" reverse="true" />
+    </uninstall>
+</package-info>
diff --git a/plugin/spoiler_bbc/src/readme.txt b/plugin/spoiler_bbc/src/readme.txt
new file mode 100644
index 0000000..acb561e
--- /dev/null
+++ b/plugin/spoiler_bbc/src/readme.txt
@@ -0,0 +1,25 @@
+[size=x-large][b]Spoiler and Hidden Tags[/b][/size]
+
+This adds the following BBCode tags to SMF:
+
+[size=large][b]Spoilers[/b][/size]
+
+Hides a block of text from users behind a warning of potential spoilers.
+Follows the somewhat-standard spoiler tag definition.
+
+By default, the following uses the subject "[b]Spoiler Text[/b]":
+
+[nobbc][spoiler]Example Spoiler[/spoiler][/nobbc]
+
+To set the subject text for the spoiler, use the following:
+
+[nobbc][spoiler=Super Fantasy RPG XXV Spoilers]Example Spoiler[/spoiler][/nobbc]
+
+[size=large][b]Login-Restricted Text[/b][/size]
+
+This is useful for content users want to keep restricted to logged-in users.
+For example, a game server's password, or a link to an unlisted YouTube video.
+
+[nobbc][noguest]The password is "haggis"[/noguest][/nobbc]
+
+No subject can be set here, it will always appear as "Logged-in users only".
diff --git a/plugin/spoiler_bbc/src/sceditor.spoilerbbc.css b/plugin/spoiler_bbc/src/sceditor.spoilerbbc.css
new file mode 100644
index 0000000..b1aa235
--- /dev/null
+++ b/plugin/spoiler_bbc/src/sceditor.spoilerbbc.css
@@ -0,0 +1,11 @@
+.sceditor-button-spoiler div {
+    background-image: url('../../default/images/icon_page_warn.svg');
+    background-size: contain;
+    background-repeat: no-repeat;
+}
+
+.sceditor-button-noguest div {
+    background-image: url('../../default/images/icon_page_shield.svg');
+    background-size: contain;
+    background-repeat: no-repeat;
+}
diff --git a/plugin/spoiler_bbc/src/sceditor.spoilerbbc.js b/plugin/spoiler_bbc/src/sceditor.spoilerbbc.js
new file mode 100644
index 0000000..8233ae7
--- /dev/null
+++ b/plugin/spoiler_bbc/src/sceditor.spoilerbbc.js
@@ -0,0 +1,263 @@
+(function (sceditor) {
+    const DEFAULT_SPOILER_TEXT = 'Spoiler';
+    const DEFAULT_NOGUEST_TEXT = 'Logged-in users only';
+
+    function isArray(x) {
+        return (x != null && 'constructor' in x && x.constructor === Array);
+    }
+
+    /**
+     * Creates an HTML element.
+     *
+     * This can set not only element properties, but also children and events,
+     * using their respectively-named properties. For example, using a button:
+     *
+     * ```js
+     * createElement('button', {
+     *     innerText: 'Button!',
+     *     events: {
+     *         'click': function() { alert('Button clicked!'); },
+     *     },
+     * });
+     * ```
+     *
+     * And an example div with children:
+     *
+     * ```js
+     * createElement('div', {
+     *     children: [
+     *         createElement('h1', {
+     *             innerText: 'Header',
+     *         }),
+     *         createElement('p', {
+     *             innerText: 'Paragraph 1',
+     *         }),
+     *         createElement('p', {
+     *             innerText: 'Paragraph 2',
+     *         }),
+     *     ],
+     * });
+     * ```
+     * 
+     * @param tag The HTML tag name. For example, 'input' for an `<input/>` element.
+     * @param params The element's parameters (e.g. `id`, `innerText`, etc).
+     * @return The HTML element.
+     */
+    function createElement(tag, params) {
+        const elem = document.createElement(tag);
+        if (params != null && typeof params === 'object') {
+            for (const key of Object.keys(params)) {
+                if (key === 'children' && isArray(params['children'])) {
+                    for (const child of params['children']) {
+                        elem.appendChild(child);
+                    }
+                } else if (key === 'events' && params != null && typeof params['events'] === 'object') {
+                    for (const evkey of Object.keys(params['events'])) {
+                        elem.addEventListener(evkey, params['events'][evkey]);
+                    }
+                } else {
+                    elem[key] = params[key];
+                }
+            }
+        }
+
+        return elem;
+    }
+
+    /**
+     * BBCode-to-HTML for Spoiler-adjacent tags.
+     */
+    function makeSpoilerHtml(tagname, title, content) {
+        let isOpen = false;
+        if (tagname === 'noguest') {
+            title = DEFAULT_NOGUEST_TEXT;
+            isOpen = true;
+        } else if (tagname === 'spoiler') {
+            if (title == null || title.trim() === '') {
+                title = DEFAULT_SPOILER_TEXT;
+            }
+        }
+
+        return '<details class="collapsible ' + tagname + '"' + (isOpen ? ' open' : '') + '>' +
+            '<summary>' + title + '</summary>' + ' ' + // <-- Load-bearing space??
+            '<div>' + content + '</div>' +
+            '</details>';
+    }
+
+    // This creates the dropdown for the user to provide a spoiler subject
+    function spoilerDropDown(editor, caller, callback) {
+        const clickAction = function (ev) {
+            const spoilSubject = document.getElementById('spoilsubject');
+
+            // The spoiler title must a) exist, and b) be a non-empty string
+            let title = null;
+            if (spoilSubject && spoilSubject.value) {
+                const val = spoilSubject.value.trim();
+                if (val !== '') {
+                    title = val;
+                }
+            }
+
+            callback(title);
+            editor.closeDropDown(true);
+            ev.preventDefault();
+        };
+        const dropDown = createElement('div', {
+            children: [
+                // Text input
+                createElement('form', {
+                    children: [
+                        createElement('label', {
+                            htmlFor: 'spoilsubject',
+                            innerText: 'Spoiler Subject:',
+                        }),
+                        createElement('input', {
+                            id: 'spoilsubject',
+                            name: 'spoilsubject',
+                            type: 'text',
+                            dir: 'ltr',
+                            placeholder: DEFAULT_SPOILER_TEXT,
+                        }),
+                    ],
+                    events: {
+                        'submit': clickAction,
+                    },
+                }),
+                // Submit button
+                createElement('div', {
+                    children: [
+                        createElement('input', {
+                            className: 'button',
+                            type: 'button',
+                            value: 'Insert',
+                            events: {
+                                'click': clickAction,
+                            },
+                        }),
+                    ],
+                }),
+            ],
+        });
+
+        editor.createDropDown(caller, 'insertspoiler', dropDown);
+    }
+
+    /**
+     * HTML-to-BBCode for Spoiler-adjacent tags.
+     */
+    function makeSpoilerBBCode(editor, tagname, element) {
+        let title = null;
+        let contentNodes = [];
+        let content = null;
+        let summaryNode = null;
+
+        for (const child of Array.from(element.children)) {
+            if (child.tagName === 'SUMMARY') {
+                summaryNode = child;
+            } else {
+                contentNodes.push(child);
+            }
+        }
+
+        if (summaryNode) {
+            element.removeChild(summaryNode);
+        }
+
+        if (tagname === 'spoiler' && summaryNode != null) {
+            // Get the custom spoiler text, if any
+            const summary = summaryNode.textContent.trim();
+            if (summary !== '' && summary !== 'Spoiler') {
+                title = '=' + summary;
+            }
+        }
+
+        if (contentNodes.length > 1) {
+            // Wrap the content in a <div/> to be safe
+            content = createElement('div', {
+                children: contentNodes,
+            });
+        } else if (contentNodes.length === 1) {
+            content = contentNodes[0];
+        }
+
+        return '[' + tagname + (title ?? '') +  ']'
+            + editor.elementToBbcode(content)
+            + '[/' + tagname + ']';
+    }
+
+    sceditor.formats.bbcode.set(
+        'spoiler', {
+            tags: {
+                details: {
+                    class: 'collapsible spoiler'
+                }
+            },
+            isInline: false,
+            breakBefore: true,
+            breakStart: true,
+            breakEnd: true,
+            breakAfter: true,
+            skipLastLineBreak: true,
+            format: function (element, content) {
+                return makeSpoilerBBCode(this, 'spoiler', element);
+            },
+            html: function (token, attrs, content) {
+                return makeSpoilerHtml('spoiler', attrs.defaultattr, content);
+            }
+    });
+
+    sceditor.formats.bbcode.set(
+        'noguest', {
+            tags: {
+                details: {
+                    class: 'collapsible noguest'
+                }
+            },
+            isInline: false,
+            breakBefore: true,
+            breakStart: true,
+            breakEnd: true,
+            breakAfter: true,
+            skipLastLineBreak: true,
+            format: function (element, content) {
+                return makeSpoilerBBCode(this, 'noguest', element);
+            },
+            html: function (token, attrs, content) {
+                return makeSpoilerHtml('noguest', null, content);
+            }
+    });
+
+    sceditor.command.set(
+        'spoiler', {
+            exec: function (caller) {
+                const editor = this;
+                spoilerDropDown(this, caller, function (title) {
+                    // TODO: can we include the selection like txtExec here?
+                    editor.wysiwygEditorInsertHtml(makeSpoilerHtml('spoiler', title, ''));
+                });
+            },
+            txtExec: function (caller, selected) {
+                const editor = this;
+                spoilerDropDown(this, caller, function (title) {
+                    editor.insertText(
+                        '[spoiler' + (title ? '=' + title : '') + ']'
+                        + selected
+                        + '[/spoiler]'
+                    );
+                });
+            }
+        }
+    );
+
+    sceditor.command.set(
+        'noguest', {
+            exec: function (caller) {
+                // TODO: can we include the selection like txtExec here?
+                this.wysiwygEditorInsertHtml(makeSpoilerHtml('noguest', null, ''));
+            },
+            txtExec: function (caller, selected) {
+                this.insertText('[noguest]' + selected + '[/noguest]');
+            }
+        }
+    );
+})(sceditor);
diff --git a/plugin/spoiler_bbc/src/spoiler_bbc.css b/plugin/spoiler_bbc/src/spoiler_bbc.css
new file mode 100644
index 0000000..15abf60
--- /dev/null
+++ b/plugin/spoiler_bbc/src/spoiler_bbc.css
@@ -0,0 +1,66 @@
+.collapsible {
+	border-width: 1px 1px 1px 3px;
+    border-style: solid;
+    margin: 0 auto 8px;
+}
+
+.collapsible > summary,
+.collapsible > div {
+    padding: 4px;
+    margin: 0;
+}
+
+.collapsible > summary {
+    list-style-type: none;
+    font-weight: bold;
+}
+
+.collapsible > summary::before {
+    display: inline-block;
+    width: 0.8em;
+    height: 0.8em;
+    margin-right: 0.25em;
+    margin-top: auto;
+    margin-bottom: auto;
+    background: url('../images/icon_expand.svg') no-repeat 0 0 / contain;
+    content: '';
+}
+
+.collapsible > summary::-webkit-details-marker {
+    display: none;
+}
+
+.collapsible[open] > summary {
+    border-bottom-width: 1px;
+    border-bottom-style: solid;
+}
+
+.collapsible[open] > summary::before {
+    background-image: url('../images/icon_minimize.svg');
+}
+
+.spoiler > summary {
+    background-color: var(--spoiler-head-background, #dcd);
+    border-color: var(--spoiler-border, #969);
+}
+
+.spoiler > div {
+    background-color: var(--spoiler-main-background, #fff9ff);
+}
+
+.spoiler {
+    border-color: var(--spoiler-border, #969);
+}
+
+.noguest > summary {
+    background-color: var(--noguest-head-background, #cce);
+    border-color: var(--noguest-border, #66a);
+}
+
+.noguest {
+    border-color: var(--noguest-border, #66a);
+}
+
+.noguest > div {
+    background-color: var(--noguest-main-background, #f9f9ff);
+}