Here's a testcase with a grid of scenarios. In Chromium/WebKit, the center-right, bottom-left, and bottom-right examples are blank (I think because the span with an orthogonal writing-mode ends up blocking the traversal).
Bug 1879957 Comment 4 Edit History
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Here's a testcase with a grid of scenarios. In Chromium/WebKit, the center-right, bottom-left, and bottom-right examples are blank (I think because the span with an orthogonal writing-mode from its parent ends up forming a box that blocks the traversal).