Yes: 
https://github.com/web-platform-tests/wpt/blob/master/dom/nodes/ParentNode-replaceChildren.html

On Tuesday, May 26, 2020 at 1:51:13 PM UTC-7, James Graham wrote:
> On 25/05/2020 16:45, Alex Vincent wrote:
> > Effective 2020-05-27, I intend to land ParentNode.replaceChildren feature
> > in mozilla-central, on by default. This has not been developed behind a
> > preference, as both I and the reviewers believe this is a small change.
> > Status in other browsers is unimplemented.
> > 
> > *Product*: N/A
> > *Bug to turn on by default*:
> > https://bugzilla.mozilla.org/show_bug.cgi?id=1626015 Please set the
> > *dev-doc-needed* keyword.
> > 
> > *Spec: *https://dom.spec.whatwg.org/#dom-parentnode-replacechildren
> > 
> > Other browsers' bugs to implement:
> > 
> >     - https://bugs.webkit.org/show_bug.cgi?id=198578
> >     -
> >     
> > https://bugs.chromium.org/p/chromium/issues/detail?id=1067384&q=replaceChildren
> 
> Does this have appropriate cross-browser (i.e. wpt) test coverage?

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