Google DevTools was showing an issue with anchor tags that opened a new window. The suggestion provided by the Google DevTools audit system was to add a relationship attribute to the anchor elements with a value of "noopener". I want to find out more about this attribute and value to see why it is suggested.
The noopener attribute on links is something that I am adding to my personal best practices list. A deep dive in the Chrome DevTools will show this as an issue when preforming audits.
For a list of other anchor(a) element relationship(rel) attribute values check out the W3C definition of relationship values.