diff --git a/.htaccess b/.htaccess
index c414742..11c8e68 100644
--- a/.htaccess
+++ b/.htaccess
@@ -1,6 +1,7 @@
 AddCharset utf-8 .shtml .html .css .php .txt .js
 
-<filesMatch ".(css)$">
+# Disable caching of CSS and JS (for testing only).
+<filesMatch ".(css|js)$">
 	Header set Cache-Control "max-age=0, public"
 </filesMatch>
 
diff --git a/assets/js/script.js b/assets/js/script.js
index ba8227d..e611719 100644
--- a/assets/js/script.js
+++ b/assets/js/script.js
@@ -402,12 +402,12 @@ function updateSiteNavUIState(event) {
 
 	// On desktop, show site nav UI when scrolling a full page up, or to the
 	// the top of the page.
-	// On mobile, show site nav UI translucent on ANY scroll up.
+	// On mobile, show site nav UI on ANY scroll up.
 	if (GW.mediaQueries.mobileNarrow.matches) {
-		if (GW.scrollState.unbrokenUpScrollDistance > 0)
+		if (GW.scrollState.unbrokenUpScrollDistance > 0 || GW.scrollState.lastScrollTop <= 0)
 			showSiteNavUI();
 	} else if (   GW.scrollState.unbrokenUpScrollDistance > window.innerHeight
-			 || GW.scrollState.lastScrollTop == 0) {
+			   || GW.scrollState.lastScrollTop == 0) {
 		showSiteNavUI();
 	}
 }