diff --git a/src/core/features/compile/components/compile-html/compile-html.ts b/src/core/features/compile/components/compile-html/compile-html.ts
index 4b9a51ab1e4..010fa869e8f 100644
--- a/src/core/features/compile/components/compile-html/compile-html.ts
+++ b/src/core/features/compile/components/compile-html/compile-html.ts
@@ -138,6 +138,10 @@ export class CoreCompileHtmlComponent implements OnChanges, OnDestroy, DoCheck {
                     this.container,
                     this.extraImports,
                 );
+
+                this.element.addEventListener('submit', (event) => {
+                    event.preventDefault();
+                });
             }
             this.componentRef && this.created.emit(this.componentRef.instance);
 
diff --git a/src/theme/theme.base.scss b/src/theme/theme.base.scss
index 6dfd9ac36b6..9f229e7b752 100644
--- a/src/theme/theme.base.scss
+++ b/src/theme/theme.base.scss
@@ -1989,15 +1989,3 @@ ion-item.item-label-stacked ion-datetime-button {
     margin-bottom: 8px;
     align-self: self-end;
 }
-
-// Development styles. Most of them temporary.
-html.development {
-    ion-checkbox.legacy-checkbox,
-    ion-radio.legacy-radio,
-    ion-select.legacy-select,
-    ion-toggle.legacy-toggle,
-    ion-textarea.legacy-textarea,
-    ion-input.legacy-input {
-        background: red !important;
-    }
-}