diff --git a/extension.json b/extension.json
index d0c659b5..b58b7e60 100644
--- a/extension.json
+++ b/extension.json
@@ -241,6 +241,11 @@
 					"enabled": true,
 					"priority": "none",
 					"no-params": true
+				},
+				"duplicate-ids": {
+					"dbid": 25,
+					"enabled": true,
+					"priority": "high"
 				}
 			}
 		},
diff --git a/i18n/en.json b/i18n/en.json
index 67e8bd8d..0c99a704 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -11,6 +11,8 @@
 	"linter-category-large-tables-desc": "These pages have tables that are hard to view on mobile",
 	"linter-category-deletable-table-tag": "Table tag that should be deleted",
 	"linter-category-deletable-table-tag-desc": "These pages have table tags that should be deleted.",
+	"linter-category-duplicate-ids": "Duplicate Ids",
+	"linter-category-duplicate-ids-desc": "These pages have elements with duplicate id attributes.",
 	"linter-category-fostered": "Fostered content",
 	"linter-category-fostered-desc": "These pages have fostered content.",
 	"linter-category-fostered-transparent": "Fostered rendering-transparent content",
@@ -78,6 +80,7 @@
 	"linter-pager-category-header": "Category",
 	"linter-pager-deletable-table-tag-details": "Table tag that should be deleted",
 	"linter-pager-details-header": "Additional info",
+	"linter-pager-duplicate-ids-details": "Duplicate ids",
 	"linter-pager-fostered-details": "Fostered content",
 	"linter-pager-fostered-transparent-details": "Fostered rendering-transparent content",
 	"linter-pager-html5-misnesting-details": "Misnesting (now broken)",
diff --git a/i18n/qqq.json b/i18n/qqq.json
index b9aaea0f..5d752764 100644
--- a/i18n/qqq.json
+++ b/i18n/qqq.json
@@ -20,6 +20,8 @@
 	"linter-category-large-tables-desc": "Description of category\n\nSimilar messages:\n* {{msg-mw|Linter-category-bogus-image-options-desc}}\n* {{msg-mw|Linter-category-fostered-desc}}\netc.",
 	"linter-category-deletable-table-tag": "Name of lint error category. See [[:mw:Help:Lint errors/deletable-table-tag]]",
 	"linter-category-deletable-table-tag-desc": "Description of category\n\nSimilar messages:\n* {{msg-mw|Linter-category-bogus-image-options-desc}}\n* {{msg-mw|Linter-category-fostered-desc}}\netc.",
+	"linter-category-duplicate-ids": "Name of lint error category. See [[:mw:Help:Lint errors/duplicate-ids]]",
+	"linter-category-duplicate-ids-desc": "Description of category\n\nSimilar messages:\n* {{msg-mw|Linter-category-deletable-table-tag-desc}}\n* {{msg-mw|Linter-category-fostered-desc}}\netc.",
 	"linter-category-fostered": "Name of lint error category. See [[:mw:Help:Lint errors/fostered]]",
 	"linter-category-fostered-desc": "Description of category. This lint error is explained on [[mw:Special:MyLanguage/Help:Lint errors/fostered]].\n\nSimilar messages:\n* {{msg-mw|Linter-category-bogus-image-options-desc}}\n* {{msg-mw|Linter-category-deletable-table-tag-desc}}\netc.",
 	"linter-category-fostered-transparent": "Name of lint error category. See [[:mw:Help:Lint errors/fostered-transparent]]\n* '''“Rendering-transparent content” means: content that is invisible in output rendering.'''\n* '''“Fostered content” means: content located in a table but misplaced, i.e., not in table cells, table headings, or captions.'''",
@@ -87,6 +89,7 @@
 	"linter-pager-category-header": "Heading of a table column showing the category of a lint error.\n{{identical|Category}}",
 	"linter-pager-deletable-table-tag-details": "Table column heading",
 	"linter-pager-details-header": "Table column heading for the linter error details",
+	"linter-pager-duplicate-ids-details": "Table column heading",
 	"linter-pager-fostered-details": "Table column heading.",
 	"linter-pager-fostered-transparent-details": "Table column heading.\n* '''“Rendering-transparent content” means: content that is invisible in output rendering.'''\n* '''“Fostered content” means: content located in a table but misplaced, i.e., not in table cells, table headings, or captions.'''",
 	"linter-pager-html5-misnesting-details": "Table column heading.",
diff --git a/includes/LintErrorsPager.php b/includes/LintErrorsPager.php
index 33b728a0..9f65173d 100644
--- a/includes/LintErrorsPager.php
+++ b/includes/LintErrorsPager.php
@@ -249,6 +249,8 @@ class LintErrorsPager extends TablePager {
 					return Html::element( 'a', [
 						'href' => $title->getLocalUrl(),
 					], $title );
+				} elseif ( $category === 'duplicate-ids' ) {
+					return Html::element( 'code', [], $lintError->params['id'] );
 				}
 				return '';
 			case 'template':