packages/demos/bower_components/shadydom/src/tree.js
function assertNative(element, property, tracked) {
  let native = getNativeProperty(element, property);
  if (native != tracked && element.__patched) {
    window.console.warn('tracked', tracked, 'native', native);
  }
  return tracked;
}
function assertNative(element, property, tracked) {
  let native = getNativeProperty(element, property);
  if (native != tracked && element.__patched) {
    window.console.warn('tracked', tracked, 'native', native);
  }
  return tracked;
}
function assertNative ( element , property , tracked ) { let native = getNativeProperty ( element , property ) ; if ( native != tracked && element . __patched ) { window . console . warn ( 'tracked' , tracked , 'native' , native ) ; } return tracked ; }
for testing...
for testing ...