Re: [whatwg/dom] Remove quadratic behavior from clone a node (PR #1334)

@smaug---- commented on this pull request.



>   <var>document</var>.
 
+ <li><p>If <var>parent</var> is non-null, then <a for=/>append</a> <var>copy</var> to
+ <var>parent</var>.
+
+ <li><p>Run any <a>cloning steps</a> defined for <var>node</var> in
+ <a>other applicable specifications</a> and pass <var>node</var>, <var>copy</var>, and
+ <var>subtree</var> as parameters.

Gecko runs cloning steps as part of cloning a single node, and I think webkit does that too https://searchfox.org/wubkat/rev/72adbb9f99534551a728acb270d4f111da5e9515/Source/WebCore/dom/Element.cpp#648,655,663 
and chrome too https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/dom/element.cc;l=755;drc=f5e280b6c11f41545154266cd2317d3c730e9b30;bpv=0;bpt=1 

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