diff --git a/demo/docs/capture.mjs b/demo/docs/capture.mjs
index ec2cd67b..0e65fd91 100644
--- a/demo/docs/capture.mjs
+++ b/demo/docs/capture.mjs
@@ -144,18 +144,18 @@ const applyDocumentationState = (page, scenario) => page.evaluate(async (current
 
   if (current.devicePresentationPreview) {
     const dialog = card.renderRoot.querySelector('hp-dialog');
-    const body = dialog?.querySelector('.body');
+    const scroller = dialog?.renderRoot?.querySelector('.content');
     const preview = dialog?.querySelector('hp-device-preview');
     await preview?.updateComplete;
-    if (!body || !preview)
+    if (!scroller || !preview)
       throw new Error('documentation device presentation preview is missing');
-    const bodyRect = body.getBoundingClientRect();
+    const scrollerRect = scroller.getBoundingClientRect();
     const previewRect = preview.getBoundingClientRect();
-    body.scrollTop += previewRect.top - bodyRect.top - 180;
+    scroller.scrollTop += previewRect.top - scrollerRect.top - 180;
     await frame();
-    const visibleBody = body.getBoundingClientRect();
+    const visibleScroller = scroller.getBoundingClientRect();
     const visiblePreview = preview.getBoundingClientRect();
-    if (visiblePreview.top < visibleBody.top - 1 || visiblePreview.bottom > visibleBody.bottom + 1)
+    if (visiblePreview.top < visibleScroller.top - 1 || visiblePreview.bottom > visibleScroller.bottom + 1)
       throw new Error('documentation viewport does not show the device presentation preview');
   }
 
diff --git a/test/capture-determinism-args.test.mjs b/test/capture-determinism-args.test.mjs
index 5020b7e4..ee7019b1 100644
--- a/test/capture-determinism-args.test.mjs
+++ b/test/capture-determinism-args.test.mjs
@@ -36,3 +36,13 @@ test('съёмка берёт набор из этого модуля, а не 
   assert.doesNotMatch(source, /const DETERMINISTIC_ARGS\s*=/,
     'собственное объявление в capture.mjs разошлось бы с проверяемым набором');
 });
+
+test('#600 кадр превью крутит единственный скроллер hp-dialog', () => {
+  const source = readFileSync(new URL('../demo/docs/capture.mjs', import.meta.url), 'utf8');
+  const block = source.match(/if \(current\.devicePresentationPreview\) \{([\s\S]*?)\n  \}/)?.[1] || '';
+  assert.match(block, /dialog\?\.renderRoot\?\.querySelector\('\.content'\)/,
+    'после #600 скроллом владеет .content в shadow root оболочки');
+  assert.match(block, /scroller\.scrollTop\s*\+=/);
+  assert.doesNotMatch(block, /querySelector\('\.body'\)/,
+    '.body больше не скроллер: такая съёмка даёт два одинаковых кадра');
+});