Although Polymer doesn't have official support for old Chrome versions, we've had a specific request to make a small change that allows Polymer to maintain compatibility with Chrome 39's implementation of document.registerElement.
We recently made a small change that can cause an undefined value in document.registerElement's options argument's extends property. We can trivially correct this by only setting extends if the user has requested to extend an element.
Although Polymer doesn't have official support for old Chrome versions, we've had a specific request to make a small change that allows Polymer to maintain compatibility with Chrome 39's implementation of
document.registerElement.We recently made a small change that can cause an
undefinedvalue in document.registerElement'soptionsargument'sextendsproperty. We can trivially correct this by only setting extends if the user has requested to extend an element.