See bug 1351827 comment 21. Here's the patch that triggers the issue in about:home: https://reviewboard.mozilla.org/r/137150/diff/1
Apparently this affects High DPI too (bug 1351827 comment 29).
Summary: SVG image set using content:url(...) becomes smaller when enlarging the page with full page zoom → SVG image set using content:url(...) becomes smaller with High DPI or when enlarging the page with full page zoom
Not a Gecko bug after all; this was caused by an obsolete CSS rule (bug 1351827 comment 31).
Status: NEW → RESOLVED
Last Resolved: 11 months ago
Resolution: --- → INVALID
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