https://bugs.webkit.org/show_bug.cgi?id=227948 Reviewed by Ryosuke Niwa. This test emulates the scenario that a small part of the page is changed. If it's applied contain: size layout, the performance should be improved. This test is a transform of the test [1] in blink. [1] third_party/blink/perf_tests/layout/css-contain-change-text.html * Layout/css-contain-change-size.html: Added. Canonical link: https://commits.webkit.org/239944@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@280286 268f45cc-cd09-0410-ab3c-d52691b4dbfc