diff --git a/packages/core/src/render3/instructions/element.ts b/packages/core/src/render3/instructions/element.ts
index 5c74054bde..52eda6249b 100644
--- a/packages/core/src/render3/instructions/element.ts
+++ b/packages/core/src/render3/instructions/element.ts
@@ -36,7 +36,7 @@ function elementStartFirstCreatePass(
 
   const hasDirectives =
       resolveDirectives(tView, lView, tNode, getConstant<string[]>(tViewConsts, localRefsIndex));
-  ngDevMode && logUnknownElementError(tView, lView, native, tNode, hasDirectives);
+  ngDevMode && warnAboutUnknownElement(tView, lView, native, tNode, hasDirectives);
 
   if (tNode.mergedAttrs !== null) {
     computeStaticStyling(tNode, tNode.mergedAttrs);
@@ -171,7 +171,7 @@ export function ɵɵelement(
   ɵɵelementEnd();
 }
 
-function logUnknownElementError(
+function warnAboutUnknownElement(
     tView: TView, lView: LView, element: RElement, tNode: TNode, hasDirectives: boolean): void {
   const schemas = tView.schemas;
 
@@ -197,17 +197,17 @@ function logUnknownElementError(
          !customElements.get(tagName));
 
     if (isUnknown && !matchingSchemas(tView, lView, tagName)) {
-      let message = `'${tagName}' is not a known element:\n`;
-      message +=
+      let warning = `'${tagName}' is not a known element:\n`;
+      warning +=
           `1. If '${tagName}' is an Angular component, then verify that it is part of this module.\n`;
       if (tagName && tagName.indexOf('-') > -1) {
-        message +=
+        warning +=
             `2. If '${tagName}' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.`;
       } else {
-        message +=
+        warning +=
             `2. To allow any element add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component.`;
       }
-      console.error(message);
+      console.warn(warning);
     }
   }
 }
diff --git a/packages/core/src/render3/instructions/shared.ts b/packages/core/src/render3/instructions/shared.ts
index 86e72d52ce..8c0fa14d48 100644
--- a/packages/core/src/render3/instructions/shared.ts
+++ b/packages/core/src/render3/instructions/shared.ts
@@ -962,7 +962,7 @@ export function elementPropertyInternal<T>(
       validateAgainstEventProperties(propName);
       if (!validateProperty(tView, lView, element, propName, tNode)) {
         // Return here since we only log warnings for unknown properties.
-        logUnknownPropertyError(propName, tNode);
+        warnAboutUnknownProperty(propName, tNode);
         return;
       }
       ngDevMode.rendererSetProperty++;
@@ -982,7 +982,7 @@ export function elementPropertyInternal<T>(
     // If the node is a container and the property didn't
     // match any of the inputs or schemas we should throw.
     if (ngDevMode && !matchingSchemas(tView, lView, tNode.tagName)) {
-      logUnknownPropertyError(propName, tNode);
+      warnAboutUnknownProperty(propName, tNode);
     }
   }
 }
@@ -1070,12 +1070,12 @@ export function matchingSchemas(tView: TView, lView: LView, tagName: string | nu
 }
 
 /**
- * Logs an error that a property is not supported on an element.
+ * Logs a warning that a property is not supported on an element.
  * @param propName Name of the invalid property.
  * @param tNode Node on which we encountered the property.
  */
-function logUnknownPropertyError(propName: string, tNode: TNode): void {
-  console.error(
+function warnAboutUnknownProperty(propName: string, tNode: TNode): void {
+  console.warn(
       `Can't bind to '${propName}' since it isn't a known property of '${tNode.tagName}'.`);
 }
 
diff --git a/packages/core/test/acceptance/ng_module_spec.ts b/packages/core/test/acceptance/ng_module_spec.ts
index 7eaba6b08a..e23031c32e 100644
--- a/packages/core/test/acceptance/ng_module_spec.ts
+++ b/packages/core/test/acceptance/ng_module_spec.ts
@@ -97,7 +97,7 @@ describe('NgModule', () => {
   });
 
   describe('schemas', () => {
-    onlyInIvy('Unknown property logs an error message instead of throwing')
+    onlyInIvy('Unknown property warning logged instead of throwing an error')
         .it('should throw on unknown props if NO_ERRORS_SCHEMA is absent', () => {
           @Component({
             selector: 'my-comp',
@@ -120,7 +120,7 @@ describe('NgModule', () => {
 
           TestBed.configureTestingModule({imports: [MyModule]});
 
-          const spy = spyOn(console, 'error');
+          const spy = spyOn(console, 'warn');
           const fixture = TestBed.createComponent(MyComp);
           fixture.detectChanges();
           expect(spy.calls.mostRecent().args[0])
@@ -185,15 +185,15 @@ describe('NgModule', () => {
       }).not.toThrow();
     });
 
-    onlyInIvy('unknown element check logs an error message rather than throwing')
-        .it('should log an error about unknown element without CUSTOM_ELEMENTS_SCHEMA for element with dash in tag name',
+    onlyInIvy('unknown element check logs a warning rather than throwing')
+        .it('should warn about unknown element without CUSTOM_ELEMENTS_SCHEMA for element with dash in tag name',
             () => {
 
               @Component({template: `<custom-el></custom-el>`})
               class MyComp {
               }
 
-              const spy = spyOn(console, 'error');
+              const spy = spyOn(console, 'warn');
               TestBed.configureTestingModule({declarations: [MyComp]});
               const fixture = TestBed.createComponent(MyComp);
               fixture.detectChanges();
@@ -215,14 +215,14 @@ describe('NgModule', () => {
               }).toThrowError(/'custom-el' is not a known element/);
             });
 
-    onlyInIvy('unknown element check logs an error message rather than throwing')
-        .it('should log an error about unknown element without CUSTOM_ELEMENTS_SCHEMA for element without dash in tag name',
+    onlyInIvy('unknown element check logs a warning rather than throwing')
+        .it('should warn about unknown element without CUSTOM_ELEMENTS_SCHEMA for element without dash in tag name',
             () => {
               @Component({template: `<custom></custom>`})
               class MyComp {
               }
 
-              const spy = spyOn(console, 'error');
+              const spy = spyOn(console, 'warn');
               TestBed.configureTestingModule({declarations: [MyComp]});
               const fixture = TestBed.createComponent(MyComp);
               fixture.detectChanges();
@@ -245,8 +245,8 @@ describe('NgModule', () => {
             });
 
     onlyInIvy('test relies on Ivy-specific AOT format')
-        .it('should not log unknown element error for AOT-compiled components', () => {
-          const spy = spyOn(console, 'error');
+        .it('should not log unknown element warning for AOT-compiled components', () => {
+          const spy = spyOn(console, 'warn');
 
           /*
            *  @Component({
@@ -310,13 +310,13 @@ describe('NgModule', () => {
           expect(spy).not.toHaveBeenCalled();
         });
 
-    onlyInIvy('unknown element check logs an error message rather than throwing')
-        .it('should not log an error about unknown elements with CUSTOM_ELEMENTS_SCHEMA', () => {
+    onlyInIvy('unknown element check logs a warning rather than throwing')
+        .it('should not warn about unknown elements with CUSTOM_ELEMENTS_SCHEMA', () => {
           @Component({template: `<custom-el></custom-el>`})
           class MyComp {
           }
 
-          const spy = spyOn(console, 'error');
+          const spy = spyOn(console, 'warn');
           TestBed.configureTestingModule({
             declarations: [MyComp],
             schemas: [CUSTOM_ELEMENTS_SCHEMA],
@@ -344,13 +344,13 @@ describe('NgModule', () => {
           }).not.toThrow();
         });
 
-    onlyInIvy('unknown element check logs an error message rather than throwing')
-        .it('should not log an error about unknown elements with NO_ERRORS_SCHEMA', () => {
+    onlyInIvy('unknown element check logs a warning rather than throwing')
+        .it('should not warn about unknown elements with NO_ERRORS_SCHEMA', () => {
           @Component({template: `<custom-el></custom-el>`})
           class MyComp {
           }
 
-          const spy = spyOn(console, 'error');
+          const spy = spyOn(console, 'warn');
           TestBed.configureTestingModule({
             declarations: [MyComp],
             schemas: [NO_ERRORS_SCHEMA],
@@ -378,8 +378,8 @@ describe('NgModule', () => {
           }).not.toThrow();
         });
 
-    onlyInIvy('unknown element check logs an error message rather than throwing')
-        .it('should not log an error about unknown elements if element matches a directive', () => {
+    onlyInIvy('unknown element check logs a warning rather than throwing')
+        .it('should not warn about unknown elements if element matches a directive', () => {
           @Component({
             selector: 'custom-el',
             template: '',
@@ -391,7 +391,7 @@ describe('NgModule', () => {
           class MyComp {
           }
 
-          const spy = spyOn(console, 'error');
+          const spy = spyOn(console, 'warn');
           TestBed.configureTestingModule({declarations: [MyComp, CustomEl]});
 
           const fixture = TestBed.createComponent(MyComp);
@@ -420,8 +420,8 @@ describe('NgModule', () => {
           }).not.toThrow();
         });
 
-    onlyInIvy('unknown element check logs an error message rather than throwing')
-        .it('should not log an error for HTML elements inside an SVG foreignObject', () => {
+    onlyInIvy('unknown element check logs a warning rather than throwing')
+        .it('should not warn for HTML elements inside an SVG foreignObject', () => {
           @Component({
             template: `
           <svg>
@@ -438,7 +438,7 @@ describe('NgModule', () => {
           class MyModule {
           }
 
-          const spy = spyOn(console, 'error');
+          const spy = spyOn(console, 'warn');
           TestBed.configureTestingModule({imports: [MyModule]});
 
           const fixture = TestBed.createComponent(MyComp);
diff --git a/packages/core/test/linker/integration_spec.ts b/packages/core/test/linker/integration_spec.ts
index 78ea7f25c6..3522819021 100644
--- a/packages/core/test/linker/integration_spec.ts
+++ b/packages/core/test/linker/integration_spec.ts
@@ -1632,7 +1632,7 @@ function declareTests(config?: {useJit: boolean}) {
     });
 
     describe('Property bindings', () => {
-      modifiedInIvy('Unknown property error throws an error instead of logging it')
+      modifiedInIvy('Unknown property error throws an error instead of logging a warning')
           .it('should throw on bindings to unknown properties', () => {
             TestBed.configureTestingModule({declarations: [MyComp]});
             const template = '<div unknown="{{ctxProp}}"></div>';
@@ -1646,20 +1646,20 @@ function declareTests(config?: {useJit: boolean}) {
             }
           });
 
-      onlyInIvy('Unknown property logs an error message instead of throwing')
+      onlyInIvy('Unknown property warning logged instead of throwing an error')
           .it('should throw on bindings to unknown properties', () => {
             TestBed.configureTestingModule({declarations: [MyComp]});
             const template = '<div unknown="{{ctxProp}}"></div>';
             TestBed.overrideComponent(MyComp, {set: {template}});
 
-            const spy = spyOn(console, 'error');
+            const spy = spyOn(console, 'warn');
             const fixture = TestBed.createComponent(MyComp);
             fixture.detectChanges();
             expect(spy.calls.mostRecent().args[0])
                 .toMatch(/Can't bind to 'unknown' since it isn't a known property of 'div'./);
           });
 
-      modifiedInIvy('Unknown property error thrown instead of logging it')
+      modifiedInIvy('Unknown property error thrown instead of a warning')
           .it('should throw on bindings to unknown properties', () => {
             TestBed.configureTestingModule({imports: [CommonModule], declarations: [MyComp]});
             const template = '<div *ngFor="let item in ctxArrProp">{{item}}</div>';
@@ -1675,12 +1675,12 @@ function declareTests(config?: {useJit: boolean}) {
             }
           });
 
-      onlyInIvy('Unknown property logs an error message instead of throwing it')
+      onlyInIvy('Unknown property logs a warning instead of throwing an error')
           .it('should throw on bindings to unknown properties', () => {
             TestBed.configureTestingModule({imports: [CommonModule], declarations: [MyComp]});
             const template = '<div *ngFor="let item in ctxArrProp">{{item}}</div>';
             TestBed.overrideComponent(MyComp, {set: {template}});
-            const spy = spyOn(console, 'error');
+            const spy = spyOn(console, 'warn');
             const fixture = TestBed.createComponent(MyComp);
             fixture.detectChanges();
             expect(spy.calls.mostRecent().args[0])
diff --git a/packages/core/test/linker/ng_module_integration_spec.ts b/packages/core/test/linker/ng_module_integration_spec.ts
index 5acc1b3ae7..152f42e68c 100644
--- a/packages/core/test/linker/ng_module_integration_spec.ts
+++ b/packages/core/test/linker/ng_module_integration_spec.ts
@@ -250,7 +250,7 @@ function declareTests(config?: {useJit: boolean}) {
             expect(() => createModule(SomeModule)).toThrowError(/Can't bind to 'someUnknownProp'/);
           });
 
-      onlyInIvy('Unknown property error logged, instead of throwing')
+      onlyInIvy('Unknown property warning logged, instead of throwing an error')
           .it('should error on unknown bound properties on custom elements by default', () => {
             @Component({template: '<div [someUnknownProp]="true"></div>'})
             class ComponentUsingInvalidProperty {
@@ -260,7 +260,7 @@ function declareTests(config?: {useJit: boolean}) {
             class SomeModule {
             }
 
-            const spy = spyOn(console, 'error');
+            const spy = spyOn(console, 'warn');
             const fixture = createComp(ComponentUsingInvalidProperty, SomeModule);
             fixture.detectChanges();
             expect(spy.calls.mostRecent().args[0]).toMatch(/Can't bind to 'someUnknownProp'/);
diff --git a/packages/core/test/linker/security_integration_spec.ts b/packages/core/test/linker/security_integration_spec.ts
index d4c9102fd4..fb077acac7 100644
--- a/packages/core/test/linker/security_integration_spec.ts
+++ b/packages/core/test/linker/security_integration_spec.ts
@@ -263,12 +263,12 @@ function declareTests(config?: {useJit: boolean}) {
                 .toThrowError(/Can't bind to 'xlink:href'/);
           });
 
-      onlyInIvy('Unknown property logs an error message instead of throwing')
+      onlyInIvy('Unknown property warning logged instead of throwing an error')
           .it('should escape unsafe SVG attributes', () => {
             const template = `<svg:circle [xlink:href]="ctxProp">Text</svg:circle>`;
             TestBed.overrideComponent(SecuredComponent, {set: {template}});
 
-            const spy = spyOn(console, 'error');
+            const spy = spyOn(console, 'warn');
             const fixture = TestBed.createComponent(SecuredComponent);
             fixture.detectChanges();
             expect(spy.calls.mostRecent().args[0]).toMatch(/Can't bind to 'xlink:href'/);
diff --git a/packages/platform-browser/test/testing_public_spec.ts b/packages/platform-browser/test/testing_public_spec.ts
index 58d438d7d0..24608a88bd 100644
--- a/packages/platform-browser/test/testing_public_spec.ts
+++ b/packages/platform-browser/test/testing_public_spec.ts
@@ -937,7 +937,7 @@ Did you run and wait for 'resolveComponentResources()'?` :
       });
 
 
-      modifiedInIvy(`Unknown property error thrown instead of logging a message`)
+      modifiedInIvy(`Unknown property error thrown instead of logging a warning`)
           .it('should error on unknown bound properties on custom elements by default', () => {
             @Component({template: '<some-element [someUnknownProp]="true"></some-element>'})
             class ComponentUsingInvalidProperty {
@@ -956,13 +956,13 @@ Did you run and wait for 'resolveComponentResources()'?` :
             restoreJasmineIt();
           });
 
-      onlyInIvy(`Unknown property error logged instead of throwing`)
+      onlyInIvy(`Unknown property warning logged instead of an error`)
           .it('should error on unknown bound properties on custom elements by default', () => {
             @Component({template: '<div [someUnknownProp]="true"></div>'})
             class ComponentUsingInvalidProperty {
             }
 
-            const spy = spyOn(console, 'error');
+            const spy = spyOn(console, 'warn');
             withModule({declarations: [ComponentUsingInvalidProperty]}, () => {
               const fixture = TestBed.createComponent(ComponentUsingInvalidProperty);
               fixture.detectChanges();