189534 2018-09-11 18:07:57 -0700 the second part of an element with filter that is split by a column-span disappears 2018-09-11 18:54:50 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified NEW FromImplementor P2 Normal --- 1 dbaron webkit-unassigned bfulgham simon.fraser zalan oldest_to_newest 1458811 0 349499 dbaron 2018-09-11 18:07:57 -0700 Created attachment 349499 testcase In the testcase http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E%0A%3Cstyle%3E%0A%0A.set%20%7B%20column-count%3A%202%3B%20height%3A%20100px%3B%20width%3A%20300px%3B%20background%3A%20yellow%3B%20column-fill%3A%20auto%20%7D%0A.filter%20%7B%20filter%3A%20blur(1px)%3B%20background%3A%20aqua%20%7D%0A.span%20%7B%20column-span%3A%20all%3B%20background%3A%20fuchsia%20%7D%0A%0A%3C%2Fstyle%3E%0A%0A%3Cdiv%20class%3D%22set%22%3E%0A%20%20A%0A%20%20%3Cdiv%20class%3D%22filter%22%3E%0A%20%20%20%20B%0A%20%20%20%20%3Cdiv%20class%3D%22span%22%3EC%3C%2Fdiv%3E%0A%20%20%20%20D%0A%20%20%3C%2Fdiv%3E%0A%20%20%20%20E%0A%3C%2Fdiv%3E , there is an element with a filter containing an element with column-span:all. The column-span causes the second part of the element with the filter to disappear. If the 'filter' property is removed, then everything is fine. Note that Edge displays correct behavior; Chrome has a different bug with the testcase, filed at https://bugs.chromium.org/p/chromium/issues/detail?id=883151 1458812 1 dbaron 2018-09-11 18:08:59 -0700 The key difference is that the expected behavior involves the letter "D" showing up (with a aqua background behind it), whereas it does not show up. 1458818 2 simon.fraser 2018-09-11 18:54:50 -0700 WebKit is generally terrible at group effects (filters, etc) on split boxes. 349499 2018-09-11 18:07:57 -0700 2018-09-11 18:07:57 -0700 testcase tc.html text/html 334 dbaron PCFET0NUWVBFIGh0bWw+CjxzdHlsZT4KCi5zZXQgeyBjb2x1bW4tY291bnQ6IDI7IGhlaWdodDog MTAwcHg7IHdpZHRoOiAzMDBweDsgYmFja2dyb3VuZDogeWVsbG93OyBjb2x1bW4tZmlsbDogYXV0 byB9Ci5maWx0ZXIgeyBmaWx0ZXI6IGJsdXIoMXB4KTsgYmFja2dyb3VuZDogYXF1YSB9Ci5zcGFu IHsgY29sdW1uLXNwYW46IGFsbDsgYmFja2dyb3VuZDogZnVjaHNpYSB9Cgo8L3N0eWxlPgoKPGRp diBjbGFzcz0ic2V0Ij4KICBBCiAgPGRpdiBjbGFzcz0iZmlsdGVyIj4KICAgIEIKICAgIDxkaXYg Y2xhc3M9InNwYW4iPkM8L2Rpdj4KICAgIEQKICA8L2Rpdj4KICAgIEUKPC9kaXY+Cg==