Bug 191289 – [WebKitTestRunner][DumpRenderTree] document.body.scrollTop is 0 after page is scrolled

• Status: NEW
• Component: Tools / Tests

[Daniel Bates]

Created attachment 353927 [details]
LayoutTest

This issue only reproduces in WebKitTestRunner and DumpRenderTree (why?). That is the test passes in Safari when run manually. Apply the attached patch and then run the test:

run-webkit-tests http/tests/navigation/frameset-cross-origin-frame-scrolls-to-anchor.html

The test will fail with the following output diff:

[[
--- /Volumes/.../layout-test-results/http/tests/navigation/frameset-cross-origin-frame-scrolls-to-anchor-expected.txt
+++ /Volumes/.../layout-test-results/http/tests/navigation/frameset-cross-origin-frame-scrolls-to-anchor-actual.txt
@@ -14,9 +14,10 @@
 PASS window.scrollY is 0
 
 After scroll:
-PASS document.body.scrollTop > 0 is true
+FAIL document.body.scrollTop > 0 should be true. Was false.
 PASS window.scrollY > 0 is true
 PASS successfullyParsed is true
+Some tests failed.
 
 TEST COMPLETE
]]

The test registers a scroll event listener and emits both document.body.scrollTop and window.scrollY. The scroll event is dispatched and window.scrollY > 0 at the end of the test. For some reason document.body.scrollTop == 0 before and after the test.

[Daniel Bates]

Created attachment 353929 [details]
LayoutTest

[Simon Fraser (smfr)]

This could be affected by the value of settings().CSSOMViewScrollingAPIEnabled(). See Document::scrollingElement().