216160 2020-09-03 17:56:31 -0700 REGRESSION(r266509): [ iOS wk2 ] css2.1/t0905-c5525-fltwidth-00-c-g.html is a constant failure 2020-09-04 12:11:43 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=215410 InRadar P2 Normal --- 1 hector_i_lopez webkit-unassigned aakash_jain ryanhaddad webkit-bot-watchers-bugzilla webkit-bug-importer zalan oldest_to_newest 1685520 0 hector_i_lopez 2020-09-03 17:56:31 -0700 css2.1/t0905-c5525-fltwidth-00-c-g.html Test is a constant failure according to history on iOS wk2. First occurrence of failure is at r(266509). History: https://results.webkit.org/?suite=layout-tests&test=css2.1%2Ft0905-c5525-fltwidth-00-c-g.html&platform=ios Diff: --- /Volumes/Data/slave/ios-simulator-13-release-tests-wk2/build/layout-test-results/css2.1/t0905-c5525-fltwidth-00-c-g-expected.txt +++ /Volumes/Data/slave/ios-simulator-13-release-tests-wk2/build/layout-test-results/css2.1/t0905-c5525-fltwidth-00-c-g-actual.txt @@ -46,7 +46,7 @@ text run at (238,340) width 155: "ignore this float text" text run at (0,360) width 257: "ignore this float text ignore this float" RenderBlock {DIV} at (0,153) size 784x520 [color=#C0C0C0] - RenderText {#text} at (392,0) size 784x519 + RenderText {#text} at (392,0) size 785x519 text run at (392,0) width 392: "this is some dummy text this is some dummy text this is" text run at (392,20) width 99: "some dummy " text run at (490,20) width 294: "text this is some dummy text this is some" @@ -79,7 +79,7 @@ text run at (392,340) width 304: "dummy text this is some dummy text this is " text run at (695,340) width 89: "some dummy" text run at (392,360) width 354: "text this is some dummy text this is some dummy text " - text run at (745,360) width 39: "this is" + text run at (745,360) width 40: "this is" text run at (0,380) width 412: "some dummy text this is some dummy text this is some dummy " text run at (411,380) width 373: "text this is some dummy text this is some dummy text this" text run at (0,400) width 54: "is some " 1px off in both size and width. May just need re-baseline. 1685521 1 webkit-bug-importer 2020-09-03 17:56:51 -0700 <rdar://problem/68313002> 1685523 2 hector_i_lopez 2020-09-03 18:03:00 -0700 Test expectation while investigated: https://trac.webkit.org/changeset/266565/webkit 1685806 3 zalan 2020-09-04 12:11:43 -0700 This is a very unfortunate float arithmetic issue where the run's x position is now 0.000061px off -and the ceil() operation in "dump renderer as text" results in a different integral value -> rect.x(745.766968) rect.width(38.233074) ceilf 785.000000 rect.x(745.766907) rect.width(38.233074) ceilf 784.000000