http://w3c-test.org/dom/nodes/Node-textContent.html fails because we don't treat undefined as an empty string in textContent's setter.
<rdar://problem/22549558>
As per https://heycam.github.io/webidl/#es-nullable-type, since the attribute is nullable, "if V is null or undefined, then return the IDL nullable type T? value null". Our generated bindings missed the "or undefined" part. I believe there is even a FIXME comment about this in the bindings generator already.
Created attachment 260462 [details] Fixes the bug
Comment on attachment 260462 [details] Fixes the bug Clearing flags on attachment: 260462 Committed r189269: <http://trac.webkit.org/changeset/189269>
All reviewed patches have been landed. Closing bug.