Mark all headers with an id

.eleventy.js

@@ -10,6 +10,7 @@ module.exports = function(eleventyConfig) {
             html: true
         })
         .use(require("markdown-it-footnote"))
+        .use(require('markdown-it-named-headings'))
         .use(require('markdown-it-task-checkbox'), {
             disabled: true,
             divWrap: false,
@@ -143,4 +144,4 @@ module.exports = function(eleventyConfig) {
         passthroughFileCopy: true,
     };
 
-};
+};

package-lock.json

@@ -18,6 +18,7 @@
                 "gray-matter": "^4.0.3",
                 "markdown-it": "^12.3.2",
                 "markdown-it-footnote": "^3.0.3",
+                "markdown-it-named-headings": "^1.1.0",
                 "markdown-it-task-checkbox": "^1.0.6"
             },
             "devDependencies": {
@@ -3266,6 +3267,20 @@
             "integrity": "sha1-+4m2WpqAKBgz8LdHizpRBPiY67M=",
             "dev": true
         },
+        "node_modules/lodash.kebabcase": {
+            "version": "4.0.1",
+            "resolved": "https://registry.npmjs.org/lodash.kebabcase/-/lodash.kebabcase-4.0.1.tgz",
+            "integrity": "sha1-XmO8mqKlVi/zuXynry+APeG8uQ4=",
+            "dependencies": {
+                "lodash.deburr": "^4.0.0",
+                "lodash.words": "^4.0.0"
+            }
+        },
+        "node_modules/lodash.words": {
+            "version": "4.2.0",
+            "resolved": "https://registry.npmjs.org/lodash.words/-/lodash.words-4.2.0.tgz",
+            "integrity": "sha1-Xs/q+Oz4rKqODIOGKV8Zk8nPQDY="
+        },
         "node_modules/lru-cache": {
             "version": "4.1.5",
             "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.5.tgz",
@@ -3305,6 +3320,15 @@
             "resolved": "https://registry.npmjs.org/markdown-it-footnote/-/markdown-it-footnote-3.0.3.tgz",
             "integrity": "sha512-YZMSuCGVZAjzKMn+xqIco9d1cLGxbELHZ9do/TSYVzraooV8ypsppKNmUJ0fVH5ljkCInQAtFpm8Rb3eXSrt5w=="
         },
+        "node_modules/markdown-it-named-headings": {
+            "version": "1.1.0",
+            "resolved": "https://registry.npmjs.org/markdown-it-named-headings/-/markdown-it-named-headings-1.1.0.tgz",
+            "integrity": "sha1-L2zSmADeHp3eCiTo1NEnXfQuoX0=",
+            "dependencies": {
+                "lodash.kebabcase": "4.0.1",
+                "unidecode": "^0.1.8"
+            }
+        },
         "node_modules/markdown-it-task-checkbox": {
             "version": "1.0.6",
             "resolved": "https://registry.npmjs.org/markdown-it-task-checkbox/-/markdown-it-task-checkbox-1.0.6.tgz",
@@ -5803,6 +5827,14 @@
                 "url": "https://github.com/sponsors/ljharb"
             }
         },
+        "node_modules/unidecode": {
+            "version": "0.1.8",
+            "resolved": "https://registry.npmjs.org/unidecode/-/unidecode-0.1.8.tgz",
+            "integrity": "sha1-77swFTi8RSRqmsjFWdcvAVMFBT4=",
+            "engines": {
+                "node": ">= 0.4.12"
+            }
+        },
         "node_modules/universal-user-agent": {
             "version": "6.0.0",
             "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-6.0.0.tgz",
@@ -8716,6 +8748,20 @@
             "integrity": "sha1-+4m2WpqAKBgz8LdHizpRBPiY67M=",
             "dev": true
         },
+        "lodash.kebabcase": {
+            "version": "4.0.1",
+            "resolved": "https://registry.npmjs.org/lodash.kebabcase/-/lodash.kebabcase-4.0.1.tgz",
+            "integrity": "sha1-XmO8mqKlVi/zuXynry+APeG8uQ4=",
+            "requires": {
+                "lodash.deburr": "^4.0.0",
+                "lodash.words": "^4.0.0"
+            }
+        },
+        "lodash.words": {
+            "version": "4.2.0",
+            "resolved": "https://registry.npmjs.org/lodash.words/-/lodash.words-4.2.0.tgz",
+            "integrity": "sha1-Xs/q+Oz4rKqODIOGKV8Zk8nPQDY="
+        },
         "lru-cache": {
             "version": "4.1.5",
             "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.5.tgz",
@@ -8761,6 +8807,15 @@
             "resolved": "https://registry.npmjs.org/markdown-it-footnote/-/markdown-it-footnote-3.0.3.tgz",
             "integrity": "sha512-YZMSuCGVZAjzKMn+xqIco9d1cLGxbELHZ9do/TSYVzraooV8ypsppKNmUJ0fVH5ljkCInQAtFpm8Rb3eXSrt5w=="
         },
+        "markdown-it-named-headings": {
+            "version": "1.1.0",
+            "resolved": "https://registry.npmjs.org/markdown-it-named-headings/-/markdown-it-named-headings-1.1.0.tgz",
+            "integrity": "sha1-L2zSmADeHp3eCiTo1NEnXfQuoX0=",
+            "requires": {
+                "lodash.kebabcase": "4.0.1",
+                "unidecode": "^0.1.8"
+            }
+        },
         "markdown-it-task-checkbox": {
             "version": "1.0.6",
             "resolved": "https://registry.npmjs.org/markdown-it-task-checkbox/-/markdown-it-task-checkbox-1.0.6.tgz",
@@ -10727,6 +10782,11 @@
                 "which-boxed-primitive": "^1.0.2"
             }
         },
+        "unidecode": {
+            "version": "0.1.8",
+            "resolved": "https://registry.npmjs.org/unidecode/-/unidecode-0.1.8.tgz",
+            "integrity": "sha1-77swFTi8RSRqmsjFWdcvAVMFBT4="
+        },
         "universal-user-agent": {
             "version": "6.0.0",
             "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-6.0.0.tgz",

package.json

@@ -30,6 +30,7 @@
         "gray-matter": "^4.0.3",
         "markdown-it": "^12.3.2",
         "markdown-it-footnote": "^3.0.3",
+        "markdown-it-named-headings": "^1.1.0",
         "markdown-it-task-checkbox": "^1.0.6"
     }
 }