Illustrating emilio's note about how `display:inline` does kinda-matter here -- here's a testcase with some text before/after the abspos element. Comparing the 1st vs. the 4th lines here (`display:inline` vs. `display:block` abspos), you can see that the hypothetical position (the placeholder frame) for the lime box ends up at a different place between those cases. (We render this particular testcase interoperably now; mostly posting as a "breaktest" to avoid breaking, and for illustration).
Bug 1769072 Comment 2 Edit History
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Illustrating emilio's note in the standup about how `display:inline` does kinda-matter here -- here's a testcase with some text before/after the abspos element. Comparing the 1st vs. the 4th lines here (`display:inline` vs. `display:block` abspos), you can see that the hypothetical position (the placeholder frame) for the lime box ends up at a different place between those cases. (We render this particular testcase interoperably now; mostly posting as a "breaktest" to avoid breaking, and for illustration).