diff --git a/.github/workflows/build-assets.yml b/.github/workflows/build-assets.yml
index 8c0a1afe..b561212d 100644
--- a/.github/workflows/build-assets.yml
+++ b/.github/workflows/build-assets.yml
@@ -11,20 +11,13 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Setting up node ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - name: Cache npm modules
-        uses: actions/cache@v2
-        with:
-          # npm cache files are stored in `~/.npm` on Linux/macOS
-          path: ~/.npm
-          key: ${{ runner.OS }}-node-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.OS }}-node-
-            ${{ runner.OS }}-
+          cache: npm
+          cache-dependency-path: public/template/package-lock.json
       - run: npm ci
         working-directory: ./public/template
       - run: npm run release
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 0039d63b..276de4c2 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -6,7 +6,7 @@ jobs:
   validate-json:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Validate language file
         uses: docker://orrosenblatt/validate-json-action:latest
         env:
diff --git a/.gitignore b/.gitignore
index c1834f67..1388fcdc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ node_modules/
 sources.json
 markdown/
 public/template/package-lock.json
+.phpunit.result.cache
diff --git a/README.md b/README.md
index 390281e4..3cd30f86 100644
--- a/README.md
+++ b/README.md
@@ -124,6 +124,31 @@ For the language switch to work, you also need to index the translations with `p
 
 **These index actions are done automatically for changed files only (much faster!) as part of `php docs.php sources:update`.** Typically you'd only need to run the full indexing the first time setting up a mirror or clone.
 
+## Markdown alerts
+
+GitHub-style alert blockquotes render as the existing `.c-callout` boxes:
+
+```markdown
+> [!NOTE]
+> Extra detail for the reader.
+
+> [!TIP]
+> A shortcut or recommended approach.
+
+> [!IMPORTANT]
+> Something easy to miss.
+
+> [!WARNING]
+> Risk or breaking change.
+
+> [!CAUTION]
+> Stronger warning than WARNING.
+```
+
+Spaces inside the marker (`[! NOTE]`) are accepted. Tables and other CommonMark features are unchanged.
+
+Page-level git history (last change and contributors) is already shown on documentation pages from the search/history index. A separate site-wide docs changelog UI is not part of this feature.
+
 ## Building assets
 
 From the `public/template/` directory, first load the dependencies with `npm install`.
diff --git a/composer.json b/composer.json
index df397fe5..1fee8268 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,8 @@
         "voku/stop-words": "^2.0"
     },
     "require-dev": {
-        "ext-intl": "*"
+        "ext-intl": "*",
+        "phpunit/phpunit": "^9.6"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
index ea010d24..1d741903 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "309a5cc08a51d2a8c2e9b29f9e585805",
+    "content-hash": "af4d118285d462bc2aefa48731957a47",
     "packages": [
         {
             "name": "caseyamcl/toc",
@@ -2136,10 +2136,1791 @@
             "time": "2018-11-23T01:37:27+00:00"
         }
     ],
-    "packages-dev": [],
+    "packages-dev": [
+        {
+            "name": "doctrine/instantiator",
+            "version": "1.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/0a0fa9780f5d4e507415a065172d26a98d02047b",
+                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "doctrine/coding-standard": "^9 || ^11",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpbench/phpbench": "^0.16 || ^1",
+                "phpstan/phpstan": "^1.4",
+                "phpstan/phpstan-phpunit": "^1",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+                "vimeo/psalm": "^4.30 || ^5.4"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "https://ocramius.github.io/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-12-30T00:15:36+00:00"
+        },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.13.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "07d290f0c47959fd5eed98c95ee5602db07e0b6a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/07d290f0c47959fd5eed98c95ee5602db07e0b6a",
+                "reference": "07d290f0c47959fd5eed98c95ee5602db07e0b6a",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3 <3.2.2"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpspec/prophecy": "^1.10",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.13.4"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-08-01T08:46:24+00:00"
+        },
+        {
+            "name": "nikic/php-parser",
+            "version": "v5.8.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "044a6a392ff8ad0d61f14370a5fbbd0a0107152f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/044a6a392ff8ad0d61f14370a5fbbd0a0107152f",
+                "reference": "044a6a392ff8ad0d61f14370a5fbbd0a0107152f",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "ext-tokenizer": "*",
+                "php": ">=7.4"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.8.0"
+            },
+            "time": "2026-07-04T14:30:18+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/54750ef60c58e43759730615a392c31c80e23176",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-phar": "*",
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:33:53+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
+            },
+            "time": "2022-02-21T01:04:05+00:00"
+        },
+        {
+            "name": "phpunit/php-code-coverage",
+            "version": "9.2.32",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "85402a822d1ecf1db1096959413d35e1c37cf1a5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/85402a822d1ecf1db1096959413d35e1c37cf1a5",
+                "reference": "85402a822d1ecf1db1096959413d35e1c37cf1a5",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-xmlwriter": "*",
+                "nikic/php-parser": "^4.19.1 || ^5.1.0",
+                "php": ">=7.3",
+                "phpunit/php-file-iterator": "^3.0.6",
+                "phpunit/php-text-template": "^2.0.4",
+                "sebastian/code-unit-reverse-lookup": "^2.0.3",
+                "sebastian/complexity": "^2.0.3",
+                "sebastian/environment": "^5.1.5",
+                "sebastian/lines-of-code": "^1.0.4",
+                "sebastian/version": "^3.0.2",
+                "theseer/tokenizer": "^1.2.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.6"
+            },
+            "suggest": {
+                "ext-pcov": "PHP extension that provides line coverage",
+                "ext-xdebug": "PHP extension that provides line coverage as well as branch and path coverage"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "9.2.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "security": "https://github.com/sebastianbergmann/php-code-coverage/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.32"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-08-22T04:23:01+00:00"
+        },
+        {
+            "name": "phpunit/php-file-iterator",
+            "version": "3.0.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "cf1c2e7c203ac650e352f4cc675a7021e7d1b3cf"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/cf1c2e7c203ac650e352f4cc675a7021e7d1b3cf",
+                "reference": "cf1c2e7c203ac650e352f4cc675a7021e7d1b3cf",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
+                "iterator"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/3.0.6"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-12-02T12:48:52+00:00"
+        },
+        {
+            "name": "phpunit/php-invoker",
+            "version": "3.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
+                "reference": "5a10147d0aaf65b58940a0b72f71c9ac0423cc67"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-invoker/zipball/5a10147d0aaf65b58940a0b72f71c9ac0423cc67",
+                "reference": "5a10147d0aaf65b58940a0b72f71c9ac0423cc67",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "ext-pcntl": "*",
+                "phpunit/phpunit": "^9.3"
+            },
+            "suggest": {
+                "ext-pcntl": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Invoke callables with a timeout",
+            "homepage": "https://github.com/sebastianbergmann/php-invoker/",
+            "keywords": [
+                "process"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
+                "source": "https://github.com/sebastianbergmann/php-invoker/tree/3.1.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T05:58:55+00:00"
+        },
+        {
+            "name": "phpunit/php-text-template",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
+                "reference": "5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28",
+                "reference": "5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Volker Dusch",
+                    "email": "github@wallbash.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Provides the functionality to export PHP variables for visualization",
+            "homepage": "https://www.github.com/sebastianbergmann/exporter",
+            "keywords": [
+                "export",
+                "exporter"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/exporter/issues",
+                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.9"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
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+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/sebastian/exporter",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2026-08-11T04:55:59+00:00"
+        },
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+            "version": "5.0.8",
+            "source": {
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+                "url": "https://github.com/sebastianbergmann/global-state.git",
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+            },
+            "require": {
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+            },
+            "require-dev": {
+                "ext-dom": "*",
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+            },
+            "suggest": {
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+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "http://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/5.0.8"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/sebastian/global-state",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-08-10T07:10:35+00:00"
+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "1.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+                "reference": "e1e4a170560925c26d424b6a03aed157e7dcc5c5"
+            },
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+                "shasum": ""
+            },
+            "require": {
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+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library for counting the lines of code in PHP source code",
+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/1.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-12-22T06:20:34+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "4.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "5c9eeac41b290a3712d88851518825ad78f45c71"
+            },
+            "dist": {
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3",
+                "sebastian/object-reflector": "^2.0",
+                "sebastian/recursion-context": "^4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/4.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-10-26T13:12:34+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "b4f479ebdbf63ac605d183ece17d8d7fe49c15c7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/b4f479ebdbf63ac605d183ece17d8d7fe49c15c7",
+                "reference": "b4f479ebdbf63ac605d183ece17d8d7fe49c15c7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/2.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-10-26T13:14:26+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "4.0.7",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "c85be6922b7fd365942b986b9a50397d65407611"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/c85be6922b7fd365942b986b9a50397d65407611",
+                "reference": "c85be6922b7fd365942b986b9a50397d65407611",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/4.0.7"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/sebastian/recursion-context",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2026-08-11T05:25:24+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "3.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "05d5692a7993ecccd56a03e40cd7e5b09b1d404e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/05d5692a7993ecccd56a03e40cd7e5b09b1d404e",
+                "reference": "05d5692a7993ecccd56a03e40cd7e5b09b1d404e",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "support": {
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-14T16:00:52+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7",
+                "reference": "75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.2-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "source": "https://github.com/sebastianbergmann/type/tree/3.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-03T06:13:03+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "3.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c6c1022351a901512170118436c764e473f6de8c",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/3.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T06:39:44+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.3.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "b7489ce515e168639d17feec34b8847c326b0b3c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/b7489ce515e168639d17feec34b8847c326b0b3c",
+                "reference": "b7489ce515e168639d17feec34b8847c326b0b3c",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.3.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-11-17T20:03:58+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
@@ -2156,5 +3937,5 @@
     "platform-overrides": {
         "php": "7.4.0"
     },
-    "plugin-api-version": "2.6.0"
+    "plugin-api-version": "2.9.0"
 }
diff --git a/src/Helpers/AlertCalloutFixer.php b/src/Helpers/AlertCalloutFixer.php
new file mode 100644
index 00000000..655481bd
--- /dev/null
+++ b/src/Helpers/AlertCalloutFixer.php
@@ -0,0 +1,166 @@
+<?php
+
+namespace MODXDocs\Helpers;
+
+use DOMDocument;
+use DOMElement;
+use DOMNode;
+use Masterminds\HTML5;
+
+/**
+ * Turns GitHub-style markdown alerts into existing .c-callout markup.
+ *
+ * Supported (optional spaces inside the marker):
+ *   > [!NOTE]
+ *   > [!TIP]
+ *   > [!IMPORTANT]
+ *   > [!WARNING]
+ *   > [!CAUTION]
+ *
+ * @see https://github.com/modxorg/Docs/issues/40
+ * @see https://github.com/modxorg/DocsApp/issues/353
+ */
+class AlertCalloutFixer
+{
+    private const TYPES = [
+        'NOTE' => [
+            'class' => 'c-callout--info',
+            'title' => 'Note',
+        ],
+        'TIP' => [
+            'class' => 'c-callout--success',
+            'title' => 'Tip',
+        ],
+        'IMPORTANT' => [
+            'class' => 'c-callout--warning',
+            'title' => 'Important',
+        ],
+        'WARNING' => [
+            'class' => 'c-callout--alert',
+            'title' => 'Warning',
+        ],
+        'CAUTION' => [
+            'class' => 'c-callout--alert',
+            'title' => 'Caution',
+        ],
+    ];
+
+    /** @var HTML5 */
+    private $htmlParser;
+
+    public function __construct(?HTML5 $htmlParser = null)
+    {
+        $this->htmlParser = $htmlParser ?? new HTML5();
+    }
+
+    public function fix(string $markup): string
+    {
+        if ($markup === '' || stripos($markup, '[!') === false) {
+            return $markup;
+        }
+
+        $partialID = uniqid('alert_fixer_', false);
+        $wrapped = sprintf("<body id='%s'>%s</body>", $partialID, $markup);
+        $domDocument = $this->htmlParser->loadHTML($wrapped);
+        $body = $domDocument->getElementById($partialID);
+        if (!$body instanceof DOMElement) {
+            return $markup;
+        }
+
+        $blockquotes = [];
+        foreach ($body->getElementsByTagName('blockquote') as $node) {
+            $blockquotes[] = $node;
+        }
+
+        foreach ($blockquotes as $blockquote) {
+            if (!$blockquote instanceof DOMElement || !$blockquote->parentNode) {
+                continue;
+            }
+
+            $type = $this->detectType($blockquote);
+            if ($type === null) {
+                continue;
+            }
+
+            $this->transformBlockquote($domDocument, $blockquote, $type);
+        }
+
+        return $this->htmlParser->saveHTML($body->childNodes);
+    }
+
+    private function detectType(DOMElement $blockquote): ?string
+    {
+        $text = ltrim($blockquote->textContent);
+        if (!preg_match('/^\[\s*!\s*(NOTE|TIP|IMPORTANT|WARNING|CAUTION)\s*\]/i', $text, $matches)) {
+            return null;
+        }
+
+        return strtoupper($matches[1]);
+    }
+
+    private function transformBlockquote(DOMDocument $dom, DOMElement $blockquote, string $type): void
+    {
+        $config = self::TYPES[$type];
+
+        $callout = $dom->createElement('div');
+        $callout->setAttribute('class', 'c-callout ' . $config['class']);
+        $callout->setAttribute('role', 'note');
+
+        $title = $dom->createElement('strong');
+        $title->setAttribute('class', 'c-callout__title');
+        $title->textContent = $config['title'];
+        $callout->appendChild($title);
+
+        $this->stripMarkerFromChildren($blockquote, $type);
+
+        while ($blockquote->firstChild) {
+            $child = $blockquote->firstChild;
+            $blockquote->removeChild($child);
+            if ($this->isEmptyParagraph($child)) {
+                continue;
+            }
+            $callout->appendChild($child);
+        }
+
+        $blockquote->parentNode->replaceChild($callout, $blockquote);
+    }
+
+    private function stripMarkerFromChildren(DOMElement $blockquote, string $type): void
+    {
+        $pattern = '/^\[\s*!\s*' . preg_quote($type, '/') . '\s*\]\s*/i';
+
+        foreach ($blockquote->childNodes as $child) {
+            if (!$child instanceof DOMElement) {
+                continue;
+            }
+
+            if (strtolower($child->tagName) !== 'p') {
+                continue;
+            }
+
+            // Prefer editing the first text node so nested HTML stays intact.
+            foreach ($child->childNodes as $inline) {
+                if ($inline->nodeType === XML_TEXT_NODE) {
+                    $inline->nodeValue = preg_replace($pattern, '', (string) $inline->nodeValue, 1);
+                    break;
+                }
+            }
+
+            // Marker-only paragraph: leave empty for later skip.
+            if (preg_match($pattern, ltrim($child->textContent))) {
+                $child->nodeValue = '';
+            }
+
+            break;
+        }
+    }
+
+    private function isEmptyParagraph(DOMNode $node): bool
+    {
+        if (!$node instanceof DOMElement || strtolower($node->tagName) !== 'p') {
+            return false;
+        }
+
+        return trim($node->textContent) === '';
+    }
+}
diff --git a/src/Model/Page.php b/src/Model/Page.php
index 367f7c8f..e9161e07 100644
--- a/src/Model/Page.php
+++ b/src/Model/Page.php
@@ -8,6 +8,7 @@
 use League\CommonMark\Environment;
 use League\CommonMark\Extension\Table\TableExtension;
 use MODXDocs\Exceptions\NotFoundException;
+use MODXDocs\Helpers\AlertCalloutFixer;
 use MODXDocs\Helpers\LinkRenderer;
 use MODXDocs\Helpers\MarkupFixer;
 use MODXDocs\Helpers\RelativeImageRenderer;
@@ -113,6 +114,9 @@ private function renderBody(): void
 
         $content = $markdown->convertToHtml($this->body);
 
+        $alertFixer = new AlertCalloutFixer();
+        $content = $alertFixer->fix($content);
+
         $fixer = new MarkupFixer();
         $this->renderedBody = $fixer->fix($content);
         $cache->set($key, $this->renderedBody, null, $hash);
diff --git a/tests/Unit/AlertCalloutFixerTest.php b/tests/Unit/AlertCalloutFixerTest.php
new file mode 100644
index 00000000..4ec05ff4
--- /dev/null
+++ b/tests/Unit/AlertCalloutFixerTest.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace Tests\Unit;
+
+use MODXDocs\Helpers\AlertCalloutFixer;
+use PHPUnit\Framework\TestCase;
+
+class AlertCalloutFixerTest extends TestCase
+{
+    /** @var AlertCalloutFixer */
+    private $fixer;
+
+    protected function setUp(): void
+    {
+        $this->fixer = new AlertCalloutFixer();
+    }
+
+    public function testConvertsNoteAlert(): void
+    {
+        $html = <<<'HTML'
+<blockquote>
+<p>[!NOTE]
+Hello <strong>bold</strong>.</p>
+</blockquote>
+<p>After</p>
+HTML;
+
+        $out = $this->fixer->fix($html);
+
+        $this->assertStringContainsString('c-callout c-callout--info', $out);
+        $this->assertStringContainsString('c-callout__title', $out);
+        $this->assertStringContainsString('Note', $out);
+        $this->assertStringContainsString('<strong>bold</strong>', $out);
+        $this->assertStringNotContainsString('[!NOTE]', $out);
+        $this->assertStringNotContainsString('<blockquote>', $out);
+        $this->assertStringContainsString('<p>After</p>', $out);
+    }
+
+    public function testAcceptsSpacedMarkerFromIssue40(): void
+    {
+        $html = <<<'HTML'
+<blockquote>
+<p>[! WARNING]
+Careful.</p>
+</blockquote>
+HTML;
+
+        $out = $this->fixer->fix($html);
+
+        $this->assertStringContainsString('c-callout--alert', $out);
+        $this->assertStringContainsString('Warning', $out);
+        $this->assertStringContainsString('Careful.', $out);
+        $this->assertStringNotContainsString('[! WARNING]', $out);
+    }
+
+    public function testTipWithSeparateMarkerParagraph(): void
+    {
+        $html = <<<'HTML'
+<blockquote>
+<p>[!TIP]</p>
+<p>Multi
+line tip.</p>
+</blockquote>
+HTML;
+
+        $out = $this->fixer->fix($html);
+
+        $this->assertStringContainsString('c-callout--success', $out);
+        $this->assertStringContainsString('Tip', $out);
+        $this->assertStringContainsString('Multi', $out);
+        $this->assertStringNotContainsString('[!TIP]', $out);
+    }
+
+    public function testLeavesOrdinaryBlockquotesAlone(): void
+    {
+        $html = '<blockquote><p>Just a quote</p></blockquote>';
+        $this->assertSame($html, $this->fixer->fix($html));
+    }
+
+    public function testMapsImportantToWarningCallout(): void
+    {
+        $html = '<blockquote><p>[!IMPORTANT] Read this.</p></blockquote>';
+        $out = $this->fixer->fix($html);
+        $this->assertStringContainsString('c-callout--warning', $out);
+        $this->assertStringContainsString('Important', $out);
+    }
+}