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diff --git a/src/templates/partials/javascripts/base.html b/src/templates/partials/javascripts/base.html
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+<!--
+  Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to
+  deal in the Software without restriction, including without limitation the
+  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+  sell copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+  IN THE SOFTWARE.
+-->
+
+<!--
+  A collection of functions used from within some partials to allow the usage
+  of state saved in local or session storage, e.g. to model preferences.
+-->
+<script>
+
+  /* Compute base path once to integrate with instant loading */
+  __md_scope = new URL("{{ config.extra.scope | d(base_url) }}", location)
+
+  /* Compute hash from the given string - see https://bit.ly/3pvPjXG */
+  __md_hash = v => [...v].reduce((h, c) => (h << 5) - h + c.charCodeAt(0), 0)
+
+  /* Fetch the value for a key from the given storage */
+  __md_get = (key, storage = localStorage, scope = __md_scope) => (
+    JSON.parse(storage.getItem(scope.pathname + "." + key))
+  )
+
+  /* Persist a key-value pair in the given storage */
+  __md_set = (key, value, storage = localStorage, scope = __md_scope) => {
+    try {
+      storage.setItem(scope.pathname + "." + key, JSON.stringify(value))
+    } catch (err) {
+      /* Uncritical, just swallow */
+    }
+  }
+</script>