Markus wrote a patch that emits the CA layer tree in HTML form so it can be inspecting in a browser. Here is one such capture using the STR in comment 0: https://mozilla.staktrace.com/bug/1667124.html The red text that says it's below the div is not where it's supposed to be. It looks like the tile in question is mostly transparent, but with a few bits of opaque stuff - the text, the back button, and the tab from the tab bar. The transform is correctly isolating the text piece, but the position on the enclosing div/layer is not what it should be.
Bug 1667124 Comment 6 Edit History
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Markus wrote a [patch](https://github.com/staktrace/gecko-dev/commit/5e43f7dccdb6b269295817a5a24830aad71f5b68) that emits the CA layer tree in HTML form so it can be inspecting in a browser. Here is one such capture using the STR in comment 0: https://mozilla.staktrace.com/bug/1667124.html The red text that says it's below the div is not where it's supposed to be. It looks like the tile in question is mostly transparent, but with a few bits of opaque stuff - the text, the back button, and the tab from the tab bar. The transform is correctly isolating the text piece, but the position on the enclosing div/layer is not what it should be.