1 files changed, 21 insertions, 0 deletions
diff --git a/doc/.markdownlint/rules/tabs_wrapper_tags.js b/doc/.markdownlint/rules/tabs_wrapper_tags.js
new file mode 100644
index 00000000000..beacec0b737
--- /dev/null
+++ b/doc/.markdownlint/rules/tabs_wrapper_tags.js
@@ -0,0 +1,21 @@
+module.exports = {
+  names: ['tabs-wrapper-tags'],
+  description: 'Unequal number of tab start and end tags',
+  information: new URL('https://docs.gitlab.com/ee/development/documentation/styleguide/#tabs'),
+  tags: ['gitlab-docs', 'tabs'],
+  function: function rule(params, onError) {
+    const tabStarts = params.lines.filter((line) => line === '::Tabs');
+    const tabEnds = params.lines.filter((line) => line === '::EndTabs');
+
+    if (tabStarts.length !== tabEnds.length) {
+      const errorIndex =
+        params.lines.indexOf('::Tabs') > 0
+          ? params.lines.indexOf('::Tabs')
+          : params.lines.indexOf('::EndTabs');
+      onError({
+        lineNumber: errorIndex + 1,
+        detail: `Opening tags: ${tabStarts.length}; Closing tags: ${tabEnds.length}`,
+      });
+    }
+  },
+};