Re: [whatwg/dom] Add "precustomized" custom element state (#894)

@rniwa commented on this pull request.



> @@ -5875,19 +5875,19 @@ dictionary ShadowRootInit {
 initialized.
 
 <p>An <a for=/>element</a>'s <a for=Element>custom element state</a> is one of
-"<code>undefined</code>", "<code>failed</code>", "<code>uncustomized</code>", or
-"<code>custom</code>". An <a for=/>element</a> whose <a for=Element>custom element state</a> is
-"<code>uncustomized</code>" or "<code>custom</code>" is said to be
-<dfn export id=concept-element-defined for=Element>defined</dfn>. An <a for=/>element</a> whose
-<a for=Element>custom element state</a> is "<code>custom</code>" is said to be
-<dfn export id=concept-element-custom for=Element>custom</dfn>.
+"<code>undefined</code>", "<code>failed</code>", "<code>uncustomized</code>",
+"<code>precustomized</code>", or "<code>custom</code>". An <a for=/>element</a> whose <a
+for=Element>custom element state</a> is "<code>uncustomized</code>", "<code>precustomized</code>",

This seems wrong. Why would a custom element be considered as *defined* before `super()` call is made in the constructor? This will be incompatible with the shipping behavior of custom elements.

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