After bug 1432966, items are silently removed when using innerHTML/createContextualFragment in chrome documents. As this differs from the regular content API, it would be helpful if there was an immediate console warning (or even js error) when items were removed. https://groups.google.com/forum/#!topic/firefox-dev/p5pQXUsxO9Q

Comment on attachment 8951290 [details] Bug 1437147 - report warnings when the sanitizer removes stuff for chrome documents, https://reviewboard.mozilla.org/r/220546/#review226652 r=me assuming we're ok with not localizing these messages... ::: dom/base/nsTreeSanitizer.h:190 (Diff revision 1) > /** > * Removes all attributes from an element node. > */ > void RemoveAllAttributes(mozilla::dom::Element* aElement); > > + void LogMessage(const char* msg, nsIDocument* aDoc, Please document the arguments. ::: dom/base/nsTreeSanitizer.cpp:1569 (Diff revision 1) > + if (aElement) { > + msg.Append(NS_LITERAL_STRING(" Element: ") + aElement->LocalName() + > + NS_LITERAL_STRING(".")); > + } > + if (aAttr) { > + msg.Append(NS_LITERAL_STRING(" Attribute: ") + nsAtomString(aAttr) + Could be nsDependentAtomString(aAttr) here

(In reply to Boris Zbarsky [:bz] (no decent commit message means r-) from comment #2) > Comment on attachment 8951290 [details] > Bug 1437147 - report warnings when the sanitizer removes stuff for chrome > documents, > > https://reviewboard.mozilla.org/r/220546/#review226652 > > r=me assuming we're ok with not localizing these messages... I think so; they're in the browser console and aimed at frontend engineers. :-)

Pushed by gijskruitbosch@gmail.com: https://hg.mozilla.org/integration/autoland/rev/da198449d15e report warnings when the sanitizer removes stuff for chrome documents, r=bz