42579 2010-07-19 11:24:17 -0700 CSS rotation transform can cause elements with certain styles to vanish during rotation. 2010-07-21 08:14:32 -0700 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) Mac (Intel) OS X 10.6 RESOLVED FIXED http://mrdarcymurphy.com/tests/css-rotation-bug.html InRadar P2 Normal --- 1 mrDarcyMurphy simon.fraser mitz simon.fraser oldest_to_newest 253297 0 mrDarcyMurphy 2010-07-19 11:24:17 -0700 While an element is rotating, any element on the page that has no height, no width, is absolutely positioned, and has overflow set to hidden will vanish for the duration of the animation. I found this because a crucial element on a page had all those, yet still had a border, and then disappeared. 253324 1 mrowe 2010-07-19 12:16:32 -0700 <rdar://problem/8207271> 253398 2 61993 simon.fraser 2010-07-19 14:37:19 -0700 Created attachment 61993 Testcase 254118 3 simon.fraser 2010-07-20 21:25:46 -0700 The disappearing element has zero height and width but a large border. clipRectToApply ends up as a 0x0 rect in RenderLayerBacking::paintIntoLayer(). 254119 4 simon.fraser 2010-07-20 21:37:34 -0700 Hmm, RenderBlock::paint() is short-circuiting the paint here: // Check if we need to do anything at all. // FIXME: Could eliminate the isRoot() check if we fix background painting so that the RenderView // paints the root's background. if (!isRoot()) { IntRect overflowBox = visibleOverflowRect(); overflowBox.inflate(maximalOutlineSize(paintInfo.phase)); overflowBox.move(tx, ty); if (!overflowBox.intersects(paintInfo.rect)) return; } paintInfo.rect is the empty rect from clipRectToApply 254121 5 simon.fraser 2010-07-20 21:47:27 -0700 Ah, this is caused by the 'inflate the paintBox for the body' logic in RenderLayerBacking::paintIntoLayer(). 254126 6 62144 simon.fraser 2010-07-20 22:30:46 -0700 Created attachment 62144 Patch 254294 7 simon.fraser 2010-07-21 08:14:32 -0700 http://trac.webkit.org/changeset/63820 61993 2010-07-19 14:37:19 -0700 2010-07-19 14:37:19 -0700 Testcase css-rotation-bug.html text/html 1594 simon.fraser PCFET0NUWVBFIGh0bWw+CjxodG1sPgoJPGhlYWQ+Cgk8bWV0YSBodHRwLWVxdWl2PSJDb250ZW50 LXR5cGUiIGNvbnRlbnQ9InRleHQvaHRtbDsgY2hhcnNldD11dGYtOCIgLz4KCQk8dGl0bGU+Q1NT IFJvdGF0aW9uIEJ1ZzwvdGl0bGU+CiAgICA8c3R5bGU+CgogICAgICAjaG92ZXJNZSB7IAogICAg ICAgIGJhY2tncm91bmQ6IHJlZDsKICAgICAgICBjb2xvcjogd2hpdGU7CiAgICAgICAgaGVpZ2h0 OiA1MHB4OwogICAgICAgIHBhZGRpbmc6IDVweDsKICAgICAgICB3aWR0aDogNTBweDsKICAgICAg ICAKICAgICAgICAtd2Via2l0LXRyYW5zaXRpb24tcHJvcGVydHk6IC13ZWJraXQtdHJhbnNmb3Jt IGJhY2tncm91bmQtY29sb3I7CiAgICAgICAgLXdlYmtpdC10cmFuc2l0aW9uLWR1cmF0aW9uOiAw 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