(In reply to Daniel Holbert [:dholbert] from comment #10) > Looks like this is a regression. We used to render my attached testcase with a consistent 1px-thickness-shadow up until we actually reach 2 display pixels; i.e. all of the boxes in my testcase would render with a consistent 1px-thick shadow, except for the final one (with explicit 2px thickness in its style) which renders with a 2px thick shadow. Here's a screenshot taken with Nightly 2019-05-26 to illustrate what that looked like.
Bug 1825871 Comment 11 Edit History
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(In reply to Daniel Holbert [:dholbert] from comment #10) > [...] We used to render my attached testcase with a consistent 1px-thickness-shadow up until we actually reach 2 display pixels; i.e. all of the boxes in my testcase would render with a consistent 1px-thick shadow, except for the final one (with explicit 2px thickness in its style) which renders with a 2px thick shadow. Here's a screenshot taken with Nightly 2019-05-26 to illustrate what that looked like.