diff --git a/src/lib/components/common/PDFViewer.svelte b/src/lib/components/common/PDFViewer.svelte
index badbb8ac58..b9d8486857 100644
--- a/src/lib/components/common/PDFViewer.svelte
+++ b/src/lib/components/common/PDFViewer.svelte
@@ -466,7 +466,7 @@
 	});
 </script>
 
-	<div class="relative {className}">
+<div class="relative {className}">
 	{#if loading}
 		<div class="absolute inset-0 flex items-center justify-center">
 			<Spinner className="size-5" />
@@ -477,17 +477,19 @@
 		</div>
 	{/if}
 
-		<div
-			class={singlePage
-				? 'overflow-hidden h-full flex items-center justify-center overscroll-contain'
-				: 'overflow-y-auto h-full'}
-			bind:this={outerContainer}
-			tabindex="0"
-			on:scroll={handleScroll}
-			on:wheel|nonpassive={handleWheel}
-			on:pointerdown={focusViewer}
-			on:keydown={handleKeyDown}
-		>
+	<div
+		class={singlePage
+			? 'overflow-hidden h-full flex items-center justify-center overscroll-contain'
+			: 'overflow-y-auto h-full'}
+		bind:this={outerContainer}
+		role="region"
+		aria-label={`${itemLabel} viewer`}
+		tabindex="0"
+		on:scroll={handleScroll}
+		on:wheel|nonpassive={handleWheel}
+		on:pointerdown={focusViewer}
+		on:keydown={handleKeyDown}
+	>
 		<div bind:this={sceneElement} class={singlePage ? '' : 'w-full'}></div>
 	</div>
 
diff --git a/src/lib/components/common/PptxPreview.svelte b/src/lib/components/common/PptxPreview.svelte
index dc9b54d7a5..72dfa60dca 100644
--- a/src/lib/components/common/PptxPreview.svelte
+++ b/src/lib/components/common/PptxPreview.svelte
@@ -231,15 +231,17 @@
 	});
 </script>
 
-	<div
-		bind:this={rootEl}
-		tabindex="0"
-		on:keydown={handleKeyDown}
-		on:pointerdown={focusPreview}
-		class="relative grid {hideThumbs
-			? 'grid-cols-[minmax(0,1fr)]'
-			: 'grid-cols-[144px_minmax(0,1fr)]'} min-h-0 bg-transparent text-gray-900 dark:text-gray-100 {className}"
-	>
+<div
+	bind:this={rootEl}
+	role="region"
+	aria-label={`${itemLabel} preview`}
+	tabindex="0"
+	on:keydown={handleKeyDown}
+	on:pointerdown={focusPreview}
+	class="relative grid {hideThumbs
+		? 'grid-cols-[minmax(0,1fr)]'
+		: 'grid-cols-[144px_minmax(0,1fr)]'} min-h-0 bg-transparent text-gray-900 dark:text-gray-100 {className}"
+>
 	<aside
 		class={hideThumbs
 			? 'hidden'