I assume you mean: WARNING: Positioned frame that does not handle positioned kids; looking further up the parent chain: file .../layout/base/nsCSSFrameConstructor.cpp, line 5565 Possible duplicate of bug 299315.
For the record, this is basically a warning saying "we haven't fixed bug 455338 yet"; we should probably ditch the warning. Though it's a little scary that we hit it on startup, since that means there's something that depends on that bug in our chrome or start page.
Created attachment 490134 [details] [diff] [review] remove warning
Attachment #490134 - Flags: review?(bzbarsky)
Fwiw, we hit this warning any time we enter ContentRangeInserted with a XUL parentFrame that's rel-pos, even if there's nothing abs pos inside, since constructing the frame constructor state looks up the absolute containing block. For browser.xul there's a rel pos button box frame that has kids dynamically inserted.
Comment on attachment 490134 [details] [diff] [review] remove warning r=me
Attachment #490134 - Flags: review?(bzbarsky) → review+
Status: NEW → RESOLVED
Last Resolved: 7 years ago
OS: Linux → All
Priority: -- → P4
Hardware: x86_64 → All
Resolution: --- → FIXED
Target Milestone: --- → mozilla2.0b8
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