Is it expected that Document has [LegacyOverrideBuiltIns]? #9394
Description
I have a question. Maybe I'm just misunderstanding. Please correct me if I'm wrong.
https://html.spec.whatwg.org/multipage/dom.html#htmlorsvgscriptelement
[LegacyOverrideBuiltIns]
partial interface Document {
...(snip)...// DOM tree accessors
getter object (DOMString name);
Document interface has [LegacyOverrideBuiltIns] in HTML spec. However, Chromium (Blink) doesn't implement [LegacyOverrideBuiltIns] on window.document nor Document nor HTMLDocument. As far as I tested with Firefox and Safari, Firefox and Safari also look not implementing [LegacyOverrideBuiltIns]. If so, is it really the consensus to have [LegacyOverrideBuiltIns]?
I ran the following JS code on Firefox and Safari JS console. The results were the same on both browsers.
document.foo = 3;
form = document.createElement('form');
form.name = 'foo';
document.foo; // => 3
document.body.appendChild(form);
document.foo; // => 3 (not `form`)
delete document.foo; // => true
document.foo; // => <form name="foo">