fix(ssr): remove dev-only accessor warnings (#5135)

packages/@lwc/engine-core/src/framework/base-bridge-element.ts

@@ -150,7 +150,10 @@ export function HTMLBridgeElementFactory(
     const descriptors: PropertyDescriptorMap = create(null);
 
     // present a hint message so that developers are aware that they have not decorated property with @api
-    if (process.env.NODE_ENV !== 'production') {
+    // Note that we also don't do this in SSR because we cannot sniff for what props are declared on
+    // HTMLElementPrototype, and it seems not worth it to have these dev-only warnings there, since
+    // an `in` check could mistakenly assume that a prop is declared on a LightningElement prototype.
+    if (process.env.NODE_ENV !== 'production' && process.env.IS_BROWSER) {
         // TODO [#3761]: enable for components that don't extend from LightningElement
         if (!isUndefined(proto) && !isNull(proto) && !hasCustomSuperClass) {
             const nonPublicPropertiesToWarnOn = new Set(

packages/@lwc/engine-server/src/__tests__/fixtures/attribute-global-html/as-component-prop/without-@api/expected.html

@@ -1,6 +1,6 @@
 <x-component>
   <template shadowrootmode="open">
-    <x-child aria-activedescendant="foo" aria-atomic="foo" aria-autocomplete="foo" aria-busy="foo" aria-checked="foo" aria-colcount="foo" aria-colindex="foo" aria-colspan="foo" aria-controls="foo" aria-current="foo" aria-describedby="foo" aria-details="foo" aria-disabled="foo" aria-errormessage="foo" aria-expanded="foo" aria-flowto="foo" aria-haspopup="foo" aria-hidden="foo" aria-invalid="foo" aria-keyshortcuts="foo" aria-label="foo" aria-labelledby="foo" aria-level="foo" aria-live="foo" aria-modal="foo" aria-multiline="foo" aria-multiselectable="foo" aria-orientation="foo" aria-owns="foo" aria-placeholder="foo" aria-posinset="foo" aria-pressed="foo" aria-readonly="foo" aria-relevant="foo" aria-required="foo" aria-roledescription="foo" aria-rowcount="foo" aria-rowindex="foo" aria-rowspan="foo" aria-selected="foo" aria-setsize="foo" aria-sort="foo" aria-valuemax="foo" aria-valuemin="foo" aria-valuenow="foo" aria-valuetext="foo" exportparts="foo" role="foo">
+    <x-child accesskey="foo" aria-activedescendant="foo" aria-atomic="foo" aria-autocomplete="foo" aria-busy="foo" aria-checked="foo" aria-colcount="foo" aria-colindex="foo" aria-colspan="foo" aria-controls="foo" aria-current="foo" aria-describedby="foo" aria-details="foo" aria-disabled="foo" aria-errormessage="foo" aria-expanded="foo" aria-flowto="foo" aria-haspopup="foo" aria-hidden="foo" aria-invalid="foo" aria-keyshortcuts="foo" aria-label="foo" aria-labelledby="foo" aria-level="foo" aria-live="foo" aria-modal="foo" aria-multiline="foo" aria-multiselectable="foo" aria-orientation="foo" aria-owns="foo" aria-placeholder="foo" aria-posinset="foo" aria-pressed="foo" aria-readonly="foo" aria-relevant="foo" aria-required="foo" aria-roledescription="foo" aria-rowcount="foo" aria-rowindex="foo" aria-rowspan="foo" aria-selected="foo" aria-setsize="foo" aria-sort="foo" aria-valuemax="foo" aria-valuemin="foo" aria-valuenow="foo" aria-valuetext="foo" dir="foo" draggable="foo" exportparts="foo" id="foo" lang="foo" role="foo" spellcheck="foo" tabindex="foo" title="foo">
       <template shadowrootmode="open">
         <span>
           accessKey: