STEPS TO REPRODUCE: Load attached testcase, in a mozilla-central nightly. EXPECTED RESULTS: There should be two lines of blinking text. ACTUAL RESULTS: The first line (for the <use>

(Sorry, accidentally hit 'enter' while filing) ACTUAL RESULTS: The first blinking line (for the <use> element) just blinks off once, and stays hidden from there on out. It also triggers this warning: { WARNING: Someone passed native anonymous content directly into frame construction. Stop doing that!: file ../../../mozilla/layout/base/nsCSSFrameConstructor.cpp, line 6117 }

This is the same problem as bug 496011 where we get a reconstruct on a native anonymous content node except for this twist in nsCSSFrameConstructor::GetAnonymousContent #ifdef MOZ_SVG // least-surprise CSS binding until we do the SVG specified // cascading rules for <svg:use> - bug 265894 if (aParent && aParent->NodeInfo()->Equals(nsGkAtoms::use, kNameSpaceID_SVG)) { content->SetFlags(NODE_IS_ANONYMOUS); } else #endif { content->SetNativeAnonymous(); } So the node we are reconstructing isn't set as the root of a native anonymous subtree and the fix in bug 496011 doesn't fix this case.

Yep. <use> is just pretty broken in general, imo.