Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
HTMLElement.outerText is a non-standard property. As a getter, it returns the same value as Node.innerText. As a setter, it removes the current node and replaces it with the given text.
Example
Specifications
Not part of any specification. Standards discussion: whatwg/html#668.
Browser compatibility
BCD tables only load in the browser