diff --git a/package-lock.json b/package-lock.json
index 15234b1..b8693b5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,6 +21,7 @@
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         "puppeteer": "~22.13.0",
         "reveal.js": "~4.4.0",
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@@ -1436,6 +1437,21 @@
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+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.45.1.tgz",
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@@ -1488,6 +1504,19 @@
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+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
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@@ -1646,6 +1675,19 @@
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@@ -1692,6 +1734,16 @@
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+      "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
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+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
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+    "node_modules/decktape/node_modules/cookies": {
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+      "resolved": "https://registry.npmjs.org/cookies/-/cookies-0.9.1.tgz",
+      "integrity": "sha512-TG2hpqe4ELx54QER/S3HQ9SRVnQnGBtKUz5bLQWtYAQ+o6GpgMs6sYUvaiJjVxb+UXwhRhAEP3m7LbsIZ77Hmw==",
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+      "license": "MIT",
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+        "keygrip": "~1.1.0"
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@@ -1757,6 +1844,12 @@
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@@ -1770,16 +1863,57 @@
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+      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
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+      "extraneous": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/decktape/node_modules/destroy": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.2.0.tgz",
+      "integrity": "sha512-2sJGJTaXIIaR1w4iJSNoN0hnMY7Gpc/n8D4qSCJw8QqFWXf7cuAgnEHxBpweaVcPevC2l3KpjYCx3NypQQgaJg==",
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+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
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     "node_modules/decktape/node_modules/devtools-protocol": {
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+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
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+    "node_modules/decktape/node_modules/encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
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@@ -1812,6 +1946,12 @@
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+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
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@@ -1908,6 +2048,15 @@
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+      "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
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@@ -1921,6 +2070,19 @@
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+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
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+      "os": [
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+      ],
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@@ -1970,6 +2132,71 @@
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+      "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.3.tgz",
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
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+      "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.0.tgz",
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+        "node": ">= 0.4"
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+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
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+      "resolved": "https://registry.npmjs.org/http-assert/-/http-assert-1.5.0.tgz",
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+      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.8.1.tgz",
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+        "inherits": "2.0.4",
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+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
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@@ -2028,6 +2255,12 @@
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@@ -2053,6 +2286,21 @@
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+      "resolved": "https://registry.npmjs.org/is-generator-function/-/is-generator-function-1.0.10.tgz",
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@@ -2090,6 +2338,109 @@
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+        "debug": "^4.1.1",
+        "http-errors": "^1.7.3",
+        "resolve-path": "^1.4.0"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/decktape/node_modules/koa-static": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/koa-static/-/koa-static-5.0.0.tgz",
+      "integrity": "sha512-UqyYyH5YEXaJrf9S8E23GoJFQZXkBVJ9zYYMPGz919MSX1KuvAcycIuS0ci150HCoPf4XQVhQ84Qf8xRPWxFaQ==",
+      "extraneous": true,
+      "dependencies": {
+        "debug": "^3.1.0",
+        "koa-send": "^5.0.0"
+      },
+      "engines": {
+        "node": ">= 7.6.0"
+      }
+    },
+    "node_modules/decktape/node_modules/koa-static/node_modules/debug": {
+      "version": "3.2.7",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
+      "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
+      "extraneous": true,
+      "dependencies": {
+        "ms": "^2.1.1"
+      }
+    },
     "node_modules/decktape/node_modules/lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -2103,6 +2454,36 @@
         "node": ">=12"
       }
     },
+    "node_modules/decktape/node_modules/media-typer": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
+      "integrity": "sha512-dq+qelQ9akHpcOl/gUVRTxVIOkAJ1wR3QAvb4RsVjS8oVoFjDGTc679wJYmUmknUF5HwMLOgb5O+a3KxfWapPQ==",
+      "extraneous": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/decktape/node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "extraneous": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/decktape/node_modules/mime-types": {
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "extraneous": true,
+      "dependencies": {
+        "mime-db": "1.52.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/decktape/node_modules/mitt": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/mitt/-/mitt-3.0.1.tgz",
@@ -2113,6 +2494,15 @@
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
       "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
     },
+    "node_modules/decktape/node_modules/negotiator": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
+      "integrity": "sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg==",
+      "extraneous": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/decktape/node_modules/netmask": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/netmask/-/netmask-2.0.2.tgz",
@@ -2121,6 +2511,18 @@
         "node": ">= 0.4.0"
       }
     },
+    "node_modules/decktape/node_modules/on-finished": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.4.1.tgz",
+      "integrity": "sha512-oVlzkg3ENAhCk2zdv7IJwd/QUD4z2RxRwpkcGY8psCVcCYZNq4wYnVWALHM+brtuJjePWiYF/ClmuDr8Ch5+kg==",
+      "extraneous": true,
+      "dependencies": {
+        "ee-first": "1.1.1"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/decktape/node_modules/once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -2129,6 +2531,12 @@
         "wrappy": "1"
       }
     },
+    "node_modules/decktape/node_modules/only": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/only/-/only-0.0.2.tgz",
+      "integrity": "sha512-Fvw+Jemq5fjjyWz6CpKx6w9s7xxqo3+JCyM0WXWeCSOboZ8ABkyvP8ID4CZuChA/wxSx+XSJmdOm8rGVyJ1hdQ==",
+      "extraneous": true
+    },
     "node_modules/decktape/node_modules/pac-proxy-agent": {
       "version": "7.0.2",
       "resolved": "https://registry.npmjs.org/pac-proxy-agent/-/pac-proxy-agent-7.0.2.tgz",
@@ -2192,6 +2600,24 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/decktape/node_modules/parseurl": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
+      "integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==",
+      "extraneous": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/decktape/node_modules/path-is-absolute": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "integrity": "sha512-AVbw3UJ2e9bq64vSaS9Am0fje1Pa8pbGqTTsmXfaIiMpnr5DlDhfJOuLj9Sf95ZPVDAUerDfEk88MPmPe7UCQg==",
+      "extraneous": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/decktape/node_modules/pdf-lib": {
       "version": "1.17.1",
       "resolved": "https://registry.npmjs.org/pdf-lib/-/pdf-lib-1.17.1.tgz",
@@ -2208,6 +2634,36 @@
       "resolved": "https://registry.npmjs.org/pend/-/pend-1.2.0.tgz",
       "integrity": "sha512-F3asv42UuXchdzt+xXqfW1OGlVBe+mxa2mqI0pg5yAHZPvFmY3Y6drSf/GQ1A86WgWEN9Kzh/WrgKa6iGcHXLg=="
     },
+    "node_modules/decktape/node_modules/playwright": {
+      "version": "1.45.1",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.45.1.tgz",
+      "integrity": "sha512-Hjrgae4kpSQBr98nhCj3IScxVeVUixqj+5oyif8TdIn2opTCPEzqAqNMeK42i3cWDCVu9MI+ZsGWw+gVR4ISBg==",
+      "extraneous": true,
+      "dependencies": {
+        "playwright-core": "1.45.1"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/decktape/node_modules/playwright-core": {
+      "version": "1.45.1",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.45.1.tgz",
+      "integrity": "sha512-LF4CUUtrUu2TCpDw4mcrAIuYrEjVDfT1cHbJMfwnE2+1b8PZcFzPNgvZCvq2JfQ4aTjRCCHw5EJ2tmr2NSzdPg==",
+      "extraneous": true,
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/decktape/node_modules/progress": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
@@ -2318,6 +2774,75 @@
         "node": ">=4"
       }
     },
+    "node_modules/decktape/node_modules/resolve-path": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/resolve-path/-/resolve-path-1.4.0.tgz",
+      "integrity": "sha512-i1xevIst/Qa+nA9olDxLWnLk8YZbi8R/7JPbCMcgyWaFR6bKWaexgJgEB5oc2PKMjYdrHynyz0NY+if+H98t1w==",
+      "extraneous": true,
+      "dependencies": {
+        "http-errors": "~1.6.2",
+        "path-is-absolute": "1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/decktape/node_modules/resolve-path/node_modules/depd": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha512-7emPTl6Dpo6JRXOXjLRxck+FlLRX5847cLKEn00PLAgc3g2hTZZgr+e4c2v6QpSmLeFP3n5yUo7ft6avBK/5jQ==",
+      "extraneous": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/decktape/node_modules/resolve-path/node_modules/http-errors": {
+      "version": "1.6.3",
+      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+      "integrity": "sha512-lks+lVC8dgGyh97jxvxeYTWQFvh4uw4yC12gVl63Cg30sjPX4wuGcdkICVXDAESr6OJGjqGA8Iz5mkeN6zlD7A==",
+      "extraneous": true,
+      "dependencies": {
+        "depd": "~1.1.2",
+        "inherits": "2.0.3",
+        "setprototypeof": "1.1.0",
+        "statuses": ">= 1.4.0 < 2"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/decktape/node_modules/resolve-path/node_modules/inherits": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+      "integrity": "sha512-x00IRNXNy63jwGkJmzPigoySHbaqpNuzKbBOmzK+g2OdZpQ9w+sxCN+VSB3ja7IAge2OP2qpfxTjeNcyjmW1uw==",
+      "extraneous": true
+    },
+    "node_modules/decktape/node_modules/resolve-path/node_modules/setprototypeof": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
+      "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ==",
+      "extraneous": true
+    },
+    "node_modules/decktape/node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "extraneous": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ]
+    },
     "node_modules/decktape/node_modules/semver": {
       "version": "7.6.0",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.0.tgz",
@@ -2343,6 +2868,12 @@
         "node": ">=10"
       }
     },
+    "node_modules/decktape/node_modules/setprototypeof": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
+      "extraneous": true
+    },
     "node_modules/decktape/node_modules/smart-buffer": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/smart-buffer/-/smart-buffer-4.2.0.tgz",
@@ -2392,6 +2923,15 @@
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.3.tgz",
       "integrity": "sha512-Oo+0REFV59/rz3gfJNKQiBlwfHaSESl1pcGyABQsnnIfWOFt6JNj5gCog2U6MLZ//IGYD+nA8nI+mTShREReaA=="
     },
+    "node_modules/decktape/node_modules/statuses": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha512-OpZ3zP+jT1PI7I8nemJX4AKmAX070ZkYPVWV/AaKTJl+tXCTGyVdC1a4SL8RUQYEwk/f34ZX8UTykN68FwrqAA==",
+      "extraneous": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/decktape/node_modules/streamx": {
       "version": "2.18.0",
       "resolved": "https://registry.npmjs.org/streamx/-/streamx-2.18.0.tgz",
@@ -2476,11 +3016,43 @@
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
       "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg=="
     },
+    "node_modules/decktape/node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "extraneous": true,
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
     "node_modules/decktape/node_modules/tslib": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
       "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg=="
     },
+    "node_modules/decktape/node_modules/tsscmp": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.6.tgz",
+      "integrity": "sha512-LxhtAkPDTkVCMQjt2h6eBVY28KCjikZqZfMcC15YBeNjkgUpdCfBu5HoiOTDu86v6smE8yOjyEktJ8hlbANHQA==",
+      "extraneous": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6.x"
+      }
+    },
+    "node_modules/decktape/node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "extraneous": true,
+      "dependencies": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/decktape/node_modules/unbzip2-stream": {
       "version": "1.4.3",
       "resolved": "https://registry.npmjs.org/unbzip2-stream/-/unbzip2-stream-1.4.3.tgz",
@@ -2514,6 +3086,15 @@
       "resolved": "https://registry.npmjs.org/urlpattern-polyfill/-/urlpattern-polyfill-10.0.0.tgz",
       "integrity": "sha512-H/A06tKD7sS1O1X2SshBVeA5FLycRpjqiBeqGKmBwBDBy28EnRjORxTNe269KSSr5un5qyWi1iL61wLxpd+ZOg=="
     },
+    "node_modules/decktape/node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "extraneous": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/decktape/node_modules/wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
@@ -2602,6 +3183,15 @@
         "fd-slicer": "~1.1.0"
       }
     },
+    "node_modules/decktape/node_modules/ylru": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/ylru/-/ylru-1.3.2.tgz",
+      "integrity": "sha512-RXRJzMiK6U2ye0BlGGZnmpwJDPgakn6aNQ0A7gHRbD4I0uvK4TW6UqkK1V0pp9jskjJBAXd3dRrbzWkqJ+6cxA==",
+      "extraneous": true,
+      "engines": {
+        "node": ">= 4.0.0"
+      }
+    },
     "node_modules/decktape/node_modules/zod": {
       "version": "3.23.8",
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.23.8.tgz",
@@ -3330,7 +3920,7 @@
       "hasInstallScript": true,
       "optional": true,
       "os": [
-        "darwin"
+        "linux"
       ],
       "engines": {
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
diff --git a/src/app/lint/lint.js b/src/app/lint/lint.js
new file mode 100644
index 0000000..c06eded
--- /dev/null
+++ b/src/app/lint/lint.js
@@ -0,0 +1,37 @@
+const titleOrCommentLinePattern =
+  /^\s*(## .*)|(<!-- \.slide: class="page-(?!title).*)$/;
+const nPreviousEmpty = 3;
+
+function allEmpty(lines) {
+  return lines.every((l) => l.trim() === "");
+}
+
+export async function containsAnyError(readStream) {
+  // Buffer circulaire pour stocker les nPreviousEmpty lignes précédentes
+  const prevLines = [];
+  var index = 1;
+  var containsError = false;
+
+  for await (const line of readStream) {
+    // Vérifie si la ligne courante match le pattern
+    if (titleOrCommentLinePattern.test(line)) {
+      if (!allEmpty(prevLines)) {
+        process.stdout.write(
+          `\n    line nb: ${index} - There must be at least ${nPreviousEmpty} blank lines before the block "${line}" .`
+        );
+        containsError = true;
+      }
+    }
+
+    // Increment du nombre de ligne
+    index += 1;
+
+    // Ajoute la ligne actuelle dans le buffer, limite la taille à nPreviousEmpty
+    prevLines.push(line);
+    if (prevLines.length > nPreviousEmpty) {
+      prevLines.shift(); // enlève la plus vieille ligne
+    }
+  }
+
+  return containsError;
+}
diff --git a/src/app/lint/lint.test.js b/src/app/lint/lint.test.js
new file mode 100644
index 0000000..b33f20a
--- /dev/null
+++ b/src/app/lint/lint.test.js
@@ -0,0 +1,97 @@
+const test = require("node:test");
+const assert = require("node:assert");
+const readline = require("readline");
+const { containsAnyError } = require("./lint");
+const { Readable } = require("node:stream");
+
+test("Lint - Contains any error should return false using a title that follows 3 empty lines.", async () => {
+  const content = `
+    # Titre de la formation
+
+
+
+    ## Sommaire
+    `;
+
+  const actual = await containsAnyError(createReadStream(content));
+  assert.strictEqual(actual, false);
+});
+
+test("Lint - Contains any error should return true using a title that not follows 3 empty lines.", async () => {
+  const content = `
+  # Titre de la formation
+  
+  ## Sommaire
+  `;
+
+  const actual = await containsAnyError(createReadStream(content));
+  assert.strictEqual(actual, true);
+});
+
+test("Lint - Contains any error should return false using a sub-title with 3 or more '#'", async () => {
+  const content = `
+  ## Sub title
+  
+  ### Sub sub title
+
+  #### Sub sub sub title
+  `;
+
+  const actual = await containsAnyError(createReadStream(content));
+  assert.strictEqual(actual, false);
+});
+
+test("Lint - Contains any error should return false using a specific html comment that follows 3 empty lines.", async () => {
+  const content = `
+    # Titre de la formation
+
+
+    
+    <!-- .slide: class="page-title" -->
+    `;
+
+  const actual = await containsAnyError(createReadStream(content));
+  assert.strictEqual(actual, false);
+});
+
+test("Lint - Contains any error should return true using a specific html comment that not follows 3 empty lines.", async () => {
+  const content = `
+    # Titre de la formation
+
+    <!-- .slide: class="page-new" -->
+    `;
+
+  const actual = await containsAnyError(createReadStream(content));
+  assert.strictEqual(actual, true);
+});
+
+test("Lint - Contains any error should return true using 2 specifics html comment that not follows 3 empty lines.", async () => {
+  const content = `
+    # Titre de la formation
+
+    <!-- .slide: class="page-new" -->
+
+    <!-- .slide: class="page-new" -->
+    `;
+
+  const actual = await containsAnyError(createReadStream(content));
+  assert.strictEqual(actual, true);
+});
+
+// page-title is an exception that do not trigger an error
+test("Lint - Contains any error should return false using html comment that with class 'page-title'.", async () => {
+  const content = `
+    # Titre de la formation
+
+    <!-- .slide: class="page-title" -->
+    `;
+
+  const actual = await containsAnyError(createReadStream(content));
+  assert.strictEqual(actual, false);
+});
+
+function createReadStream(content) {
+  return readline.createInterface({
+    input: Readable.from(content),
+  });
+}
diff --git a/src/cli/cli.js b/src/cli/cli.js
index bef9c6e..e9c49a1 100644
--- a/src/cli/cli.js
+++ b/src/cli/cli.js
@@ -3,11 +3,13 @@
 const spawn = require("child_process").spawn;
 const fork = require("child_process").fork;
 const fs = require("fs");
+const readline = require("readline");
 const path = require("path");
 const WebpackDevServer = require("webpack-dev-server");
 const webpackConfig = require("../build/webpack.config");
 const webpack = require("webpack");
 const yargs = require("yargs/yargs");
+const { containsAnyError } = require("../app/lint/lint");
 
 /**
  *
@@ -36,6 +38,9 @@ async function cli(args, env) {
     case "pdf":
       await pdf(options);
       break;
+    case "lint":
+      await lint(options);
+      break;
     default:
       throw new Error(`unknown command: '${command}'`);
   }
@@ -61,6 +66,58 @@ async function serve(buildOptions, serveOptions) {
   }
 }
 
+async function lint(options) {
+  const material = options.material;
+  console.info(`Start linting from material '${material}...`);
+
+  var hasError = false;
+
+  for (const f of fs.readdirSync(material)) {
+    if (!f.startsWith(".")) {
+      const hasSubFolderError = await lintMardownFiles(path.join(material, f));
+      hasError = hasError || hasSubFolderError;
+    }
+  }
+
+  if (hasError) {
+    process.exit(-1);
+  }
+}
+
+async function lintMardownFiles(file) {
+  if (fs.lstatSync(file).isDirectory()) {
+    var containsError = false;
+
+    for (const f of fs.readdirSync(file)) {
+      const hasSubFolderError = await lintMardownFiles(path.join(file, f));
+      containsError = containsError || hasSubFolderError;
+    }
+
+    return containsError;
+  } else if (
+    fs.lstatSync(file).isFile() &&
+    file.endsWith(".md") &&
+    !file.endsWith("README.md")
+  ) {
+    process.stdout.write("  Verifying file: " + file + ": ");
+    const containsError = await containsAnyError(createReadStream(file));
+
+    if (containsError) {
+      console.log(`\n❌ The file "${file}" contains one or more errors.`);
+    } else {
+      console.debug("✅");
+    }
+
+    return containsError;
+  }
+}
+
+function createReadStream(filePath) {
+  return readline.createInterface({
+    input: fs.createReadStream(filePath),
+  });
+}
+
 function build(options) {
   console.log("Build slides & labs");
   return new Promise((resolve, reject) => {
@@ -254,6 +311,10 @@ cli(
       "build the static web site",
       describePositionalArguments
     )
+    .command(
+      "lint [material]",
+      "lint each Markdown files (e.g. check the number of empty new lines before new slides)"
+    )
     .option("config", {
       type: "string",
       describe: