python
diff --git a/‎_static/activate_tab.js‎
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diff --git a/‎conf.py‎
Lines changed: 3 additions & 0 deletions b/‎conf.py‎
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diff --git a/‎index.rst‎
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diff --git a/‎testing/run-write-tests.rst‎
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@@ -0,0 +1,42 @@
+// Based on https://stackoverflow.com/a/38241481/724176
+function getOS() {
+  const userAgent = window.navigator.userAgent,
+    platform =
+      window.navigator?.userAgentData?.platform || window.navigator.platform,
+    macosPlatforms = ["macOS", "Macintosh", "MacIntel", "MacPPC", "Mac68K"],
+    windowsPlatforms = ["Win32", "Win64", "Windows", "WinCE"],
+    iosPlatforms = ["iPhone", "iPad", "iPod"];
+
+  if (macosPlatforms.includes(platform)) {
+    return "macOS";
+  } else if (iosPlatforms.includes(platform)) {
+    return "iOS";
+  } else if (windowsPlatforms.includes(platform)) {
+    return "Windows";
+  } else if (/Android/.test(userAgent)) {
+    return "Android";
+  } else if (/Linux/.test(platform)) {
+    return "Unix";
+  }
+
+  return "unknown";
+}
+
+function activateTab(tabName) {
+  // Find all label elements containing the specified tab name
+  const labels = document.querySelectorAll(".tab-label");
+
+  labels.forEach((label) => {
+    if (label.textContent.includes(tabName)) {
+      // Find the associated input element using the 'for' attribute
+      const tabInputId = label.getAttribute("for");
+      const tabInput = document.getElementById(tabInputId);
+
+      // Check if the input element exists before attempting to set the "checked" attribute
+      if (tabInput) {
+        // Activate the tab by setting its "checked" attribute to true
+        tabInput.checked = true;
+      }
+    }
+  });
+}
@@ -45,6 +45,9 @@
 html_css_files = [
     'devguide_overrides.css',
 ]
+html_js_files = [
+    "activate_tab.js",
+]
 html_logo = "_static/python-logo.svg"
 html_favicon = "_static/favicon.png"
 
 
@@ -2,6 +2,14 @@
 Python Developer's Guide
 ========================
 
+.. raw:: html
+
+    <script>
+    document.addEventListener('DOMContentLoaded', function() {
+      activateTab(getOS());
+    });
+    </script>
+
 .. highlight:: bash
 
 This guide is a comprehensive resource for :ref:`contributing <contributing>`
 
@@ -5,6 +5,14 @@
 Running and writing tests
 =========================
 
+.. raw:: html
+
+    <script>
+    document.addEventListener('DOMContentLoaded', function() {
+      activateTab(getOS());
+    });
+    </script>
+
 .. note::
 
     This document assumes you are working from an
Original file line number	Diff line number	Diff line change
`@@ -45,6 +45,9 @@`
`45`	`45`	`html_css_files = [`
`46`	`46`	`'devguide_overrides.css',`
`47`	`47`	`]`
	`48`	`+html_js_files = [`
	`49`	`+ "activate_tab.js",`
	`50`	`+]`
`48`	`51`	`html_logo = "_static/python-logo.svg"`
`49`	`52`	`html_favicon = "_static/favicon.png"`
`50`	`53`