A clever way to implement a htmx-like mechanism of substituting the content of a node with the response of a request.

It works like this. Have a hidden iframe whose onload callback sets the target node (specified by hash) with the iframe's body content. Then use an a element to trigger the iframe load: <a target=_the_iframe href="/req-url#target-element">.

TIL: a[target], iframe[hidden], contentWindow, contentDocument, <base target=X>