1 files changed, 27 insertions, 1 deletions
diff --git a/testing/web-platform/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/capture_screenshot.py b/testing/web-platform/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/capture_screenshot.py
index 40497ce6ac..414f5ae2d0 100644
--- a/testing/web-platform/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/capture_screenshot.py
+++ b/testing/web-platform/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/capture_screenshot.py
@@ -1,6 +1,6 @@
 import pytest
 
-from math import floor
+from math import ceil, floor
 from tests.support.image import png_dimensions
 
 from . import get_physical_viewport_dimensions
@@ -79,3 +79,29 @@ async def test_capture_with_viewport(bidi_session, new_tab, delta_width, delta_h
     result = await bidi_session.browsing_context.capture_screenshot(
         context=new_tab["context"])
     assert png_dimensions(result) == (expected_size["width"], expected_size["height"])
+
+
+@pytest.mark.parametrize("dpr", [0.5, 2])
+@pytest.mark.asyncio
+async def test_capture_with_different_dpr(bidi_session, new_tab, inline, dpr):
+    page = inline("<div style='background-color: black; width: 100px; height: 100px;'></div>")
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"], url=page, wait="complete"
+    )
+
+    original_viewport = await get_viewport_dimensions(bidi_session, new_tab)
+
+    await bidi_session.browsing_context.set_viewport(
+        context=new_tab["context"],
+        device_pixel_ratio=dpr)
+
+    expected_width = original_viewport["width"] * dpr
+    expected_height = original_viewport["height"] * dpr
+
+    data = await bidi_session.browsing_context.capture_screenshot(context=new_tab["context"])
+    (actual_width, actual_height) = png_dimensions(data)
+    # The rounding is implementation-specific and can be either floor, ceil or round depending on the browser
+    # implementation. Tolerate any value between floor and ceil.
+    assert floor(expected_width) <= actual_width <= ceil(expected_width)
+    assert floor(expected_height) <= actual_height <= ceil(expected_height)
+