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 ## Content Management Systems
 
 * [WordPress](./WordPress/)
+* [Squarespace](./Squarespace/)
 
 ## Front End Libraries
 
diff --git a/Squarespace/README.md b/Squarespace/README.md
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+---
+title: Squarespace Installation
+---
+# Squarespace Installation
+
+This page covers steps specific to Squarespace. For the general accessible SVG
+techniques (in-line vs. `<img>`), favicon installation, and the universal
+light/dark mode CSS, see the [Installation Guide](../Installation/).
+
+The steps below assume Squarespace 7.1, the current default for new sites;
+menu labels are similar on 7.0 but may be organized differently, so check
+against your own site if something doesn't match.
+
+## A Note on SVG Sanitization
+
+Squarespace's built-in image and logo uploaders run every SVG you upload
+through a sanitizer that strips `<style>` and `<script>` elements. Since
+SmartSVG:tm:'s light/dark and forced-colors behavior lives entirely inside a
+`<style>` block, uploading it through the standard image or logo panel will
+silence that behavior — the file will still display, but as a flat, static
+image. The two methods below place the SmartSVG:tm: markup directly on the
+page through a Code Block or Code Injection instead, which Squarespace does
+not sanitize.
+
+## Method 1: Code Block (In-line)
+
+1. Edit the page or section where your logo should appear. In the Site
+   Header, click into the header to edit it and use the block picker to add
+   a Code Block (on templates where the header doesn't support blocks
+   directly, add the Code Block to the page content instead, positioned
+   where you want the logo).
+2. Paste your SmartSVG:tm: markup directly into the Code Block, the same way
+   you would for the in-line method described in the
+   [Installation Guide](../Installation/) for a hand-written page.
+3. Save. Because a Code Block renders raw HTML unchanged, the `<style>`
+   block inside your SmartSVG:tm: is preserved, so light/dark mode and
+   forced-colors switching keep working.
+
+## Method 2: Code Injection (Favicon & Universal CSS)
+
+Code Injection lets you add markup to every page on your site without
+editing a template. It's available under **Settings → Advanced → Code
+Injection**, and requires a Business plan or higher (it isn't available on
+the Personal plan).
+
+* For the SmartSVG:tm: favicon files (see the "SmartSVG Favicon Installation"
+  section of the [Installation Guide](../Installation/)), upload them under
+  **Settings → Advanced → Assets Library** (or any File Storage panel your
+  plan provides) to get a hosted URL for each file, then paste the `<link>`
+  tags from the favicon guide into the **Header** field of Code Injection,
+  pointing at those URLs. Squarespace's own favicon uploader only accepts a
+  single square image, so it can't drive the full multi-format smart
+  favicon setup on its own.
+* For the universal light/dark mode and forced-colors CSS (see the
+  "Universal CSS" section of the [Installation Guide](../Installation/)),
+  the simplest path is Squarespace's native CSS editor at **Design → Custom
+  CSS** — paste the CSS there directly, without the surrounding `<style>`
+  tags. Code Injection's **Header** field also works if you prefer to keep
+  everything in one place; in that case wrap the CSS in a `<style>` tag.