Added 1.0 files

extension.json

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+{
+    "name": "Spoiler▓Alert",
+    "author": "Samuel Maenle",
+    "url": "https://git.maenle.net/diocloid/SpoilerAlert",
+    "description": "This MediaWiki extension allows users to create spoiler tags that reveal content on click. <code>&lt;spoiler&gt; I am a spoiler &lt;/spoiler&gt;</code>",
+    "type": "parserhook",
+    "version": "1.0",
+    "license-name": "AGPL-3.0-only",
+    "manifest_version": 2,
+    "AutoloadClasses": {
+        "SpoilerAlertHooks": "includes/SpoilerAlertHooks.php"
+    },
+    "Hooks": {
+        "BeforePageDisplay": [
+            "SpoilerAlertHooks::onBeforePageDisplay"
+        ],
+        "ParserFirstCallInit": [
+            "SpoilerAlertHooks::onParserFirstCallInit"
+        ]
+    },
+    "ResourceModules": {
+        "ext.spoileralert": {
+            "scripts": [
+            ],
+            "styles": [
+                "/modules/ext.spoileralert.css"
+            ],
+            "position": "top"
+        }
+    },
+    "ResourceFileModulePaths": {
+	"localBasePath": "",
+	"remoteExtPath": "SpoilerAlert"
+    }
+}

includes/SpoilerAlertHooks.php

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+<?php
+class SpoilerAlertHooks {
+    public static function onParserFirstCallInit( Parser $parser ) {
+        $parser->setHook( 'spoiler', [ self::class, 'renderSpoiler' ] );
+        return true;
+    }
+
+    public static function renderSpoiler( $input, array $args, Parser $parser, PPFrame $frame ) {
+        $output = $parser->recursiveTagParse( $input, $frame );
+        return "<span class='spoiler' onclick='this.classList.toggle(\"revealed\")'>" . htmlspecialchars( $output ) . "</span>";
+    }
+
+    public static function onBeforePageDisplay( OutputPage &$out, Skin &$skin ) {
+        $out->addModules( ['ext.spoileralert'] );
+        return true;
+    }
+}

modules/ext.spoileralert.css

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+.spoiler {
+    background-color: black;
+    color: black;
+    transition: color 0.5s ease;
+    cursor: pointer;
+}
+
+.spoiler.revealed {
+    color: white;
+}