mkdocs-nested-tabs

Shows two hierarchy levels of navigation.tabs - one parent level, with it's children displayed below it. An alternative to Material for MkDocs' native hover-triggered tab dropdown (one category's children at a time).

Status

Early scaffold, ported and generalized from a working implementation. Not yet published.

Install

pip install mkdocs-nested-tabs   # not yet published

# mkdocs.yml
theme:
  name: material
  features:
    - navigation.tabs

plugins:
  - nested-tabs

Requires navigation.tabs to be enabled — this plugin replaces that feature's tab bar on desktop widths (≥76.234375em, matching Material's own breakpoint), it doesn't work alongside a site with tabs disabled.

How it works

Reads Material's own primary sidebar nav at runtime (which already contains the full site tree — every category, not just the active one) and builds a second row inserted directly into .md-header, right after .md-tabs, so it inherits the header's own sticky positioning and background for free. A category with a third nesting level (a sub-category with its own children, rather than a flat list of pages) doesn't fit the "category + pages" shape this renders, so it falls back to a single link using the first leaf page found inside it.

Config

plugins:
  - nested-tabs:
      enabled: true   # default

A configurable breakpoint and an option to keep Material's native tabs alongside this row instead of hiding them. Both need the static JS/CSS to be templated per-build rather than shipped as fixed package assets.

Theming

Falls back to Material's own --md-default-fg-color/--md-accent-fg-color so it looks reasonable on any palette out of the box. Override via:

:root {
  --md-nested-tabs-label-color: ...;
  --md-nested-tabs-link-color: ...;
}

Development

python3 -m venv .venv && source .venv/bin/activate
pip install -e . mkdocs-material pytest
python -m pytest tests/

Manual check: cd tests/fixture_site && mkdocs serve, then open the site and confirm the nested-tabs row renders at desktop width.