Changeset 286595 in webkit

Timestamp:

Dec 7, 2021, 3:36:58 AM (5 years ago)

Author:

cathiechen

Message:

[Performance test][css-contain] Add test large-grid.html
​https://bugs.webkit.org/show_bug.cgi?id=233628

Reviewed by Rob Buis.

This test large-grid.html is imported from Chromium, and we change it a little bit.
This case tests the performance of getting gridContainer.offsetHeight which is the parent of
a large grid with contain: strict. The performance is improved when enable CSS contain,
because offsetHeight returns the value directly if the element doesn't need relayout, see
Document::updateLayoutIfDimensionsOutOfDate. contain: strict sets a relayout boundary to
the large grid, so when its subtree changes, the container of the large grid doesn't need
relayout.

• Layout/large-grid.html: Added.

Location:

trunk/PerformanceTests

Files:

• ChangeLog (modified) (1 diff)
• Layout/large-grid.html (added)

trunk/PerformanceTests/ChangeLog

@@ +1 @@
+2021-12-07  Cathie Chen  <cathiechen@igalia.com>
+
+        [Performance test][css-contain] Add test large-grid.html
+        https://bugs.webkit.org/show_bug.cgi?id=233628
+
+        Reviewed by Rob Buis.
+
+        This test large-grid.html is imported from Chromium, and we change it a little bit.
+        This case tests the performance of getting gridContainer.offsetHeight which is the parent of
+        a large grid with `contain: strict`. The performance is improved when enable CSS contain,
+        because offsetHeight returns the value directly if the element doesn't need relayout, see
+        `Document::updateLayoutIfDimensionsOutOfDate`. `contain: strict` sets a relayout boundary to
+        the large grid, so when its subtree changes, the container of the large grid doesn't need
+        relayout.
+
+        * Layout/large-grid.html: Added.
+
 2021-12-06  Zan Dobersek  <zdobersek@igalia.com>