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+## Annotations
+| Annotation          | `defineXXX()`                  | Run time | Spec     | Compiler | Back Patch |
+| -------------------- | ------------------------------ | ------- | -------- | -------- | -------- |
+| `@Component`         | ✅ `defineComponent()`         |    ✅   |  ✅      |  ✅      |  ❌      |
+| `@Directive`         | ✅ `defineDirective()`         |    ✅   |  ✅      |  ✅      |  ❌      |
+| `@Directive`         | ❌ `defineAbstractDirective()` |    ❌   |  ❌      |  ❌      |  ❌      |
+| `@Pipe`              | ✅ `definePipe()`              |    ✅   |  ✅      |  ✅      |  ❌      |
+| `@Injectable`        | ❌ `defineInjectable()`        |    ❌   |  ❌      |  ❌      |  ❌      |
+| `@NgModule`          | ❌ `defineInjector()`          |    ❌   |  ❌      |  ❌      |  ❌      |
+| `@ConfigureInjector` | ❌ `defineInjector()`          |    ❌   |  ❌      |  ❌      |  ❌      |
+
+
+
+## Component Composition
+| Feature                                  | Runtime | Spec     | Compiler |
+| ---------------------------------------- | ------- | -------- | -------- |
+| creation reordering based on injection   |   ❌    |    ❌    |    ✅    |
+| `class CompA extends CompB {}`           |   ❌    |    ❌    |    ❌    |
+| `class CompA extends CompB { @Input }`   |   ❌    |    ❌    |    ❌    |
+| `class CompA extends CompB { @Output }`  |   ❌    |    ❌    |    ❌    |
+
+
+
+## Life Cycle Hooks
+| Feature                   | Runtime | Spec     | Compiler |
+| ------------------------- | ------- | -------- | -------- |
+| `onChanges()`             |    ✅   |  ✅      |  ✅      |
+| `onDestroy()`             |    ✅   |  ✅      |  ✅      |
+| `onInit()`                |    ✅   |  ✅      |  ✅      |
+| `onChanges()`             |    ✅   |  ✅      |  ✅      |
+| `doCheck()`               |    ✅   |  ✅      |  ✅      |
+| `afterViewChecked()`      |    ✅   |  ✅      |  ✅      |
+| `afterViewInit()`         |    ✅   |  ✅      |  ✅      |
+| `afterContentChecked()`   |    ✅   |  ✅      |  ✅      |
+| `afterContentInit()`      |    ✅   |  ✅      |  ✅      |
+| listener teardown         |    ✅   |  ✅      |  ✅      |
+
+
+
+## Template Syntax
+| Feature                          | Runtime | Spec     | Compiler |
+| -------------------------------- | ------- | -------- | -------- |
+| `<div>`                          |  ✅     |  ✅      |  ✅      |
+| `<div>{{exp}}</div>`             |  ✅     |  ✅      |  ✅      |
+| `<div attr=value>`               |  ✅     |  ✅      |  ✅      |
+| `<div (click)="stmt">`           |  ✅     |  ✅      |  ✅      |
+| `<div #foo>`                     |  ✅     |  ✅      |  ✅      |
+| `<div #foo="bar">`               |  ✅     |  ✅      |  ✅      |
+| `<div [value]="exp">`            |  ✅     |  ✅      |  ✅      |
+| `<div title="Hello {{name}}!">`  |  ✅     |  ✅      |  ✅      |
+| `<div [attr.value]="exp">`       |  ✅     |  ✅      |  ❌      |
+| `<div class="literal">`          |  ✅     |  ✅      |  ✅      |
+| `<div [class]="exp">`            |  ❌     |  ❌      |  ❌      |
+| `<div [class.foo]="exp">`        |  ✅     |  ✅      |  ❌      |
+| `<div style="literal">`          |  ✅     |  ✅      |  ✅      |
+| `<div [style]="exp">`            |  ❌     |  ❌      |  ❌      |
+| `<div [style.foo]="exp">`        |  ✅     |  ✅      |  ❌      |
+| `{{ ['literal', exp ] }}`        |  ✅     |  ✅      |  ❌      |
+| `{{ { a: 'literal', b: exp } }}` |  ✅     |  ✅      |  ❌      |
+| `{{ exp \| pipe: arg }}`         |  ✅     |  ✅       |  ❌      |
+
+
+
+## `@Query`
+| Feature                         | Runtime | Spec     | Compiler |
+| ------------------------------- | ------- | -------- | -------- |
+| `@Query(descendants)`           |  ✅     |  ✅      |  ❌      |
+| `@Query(one)`                   |  ✅     |  ✅      |  ❌      |
+| `@Query(read)`                  |  ✅     |  ✅      |  ❌      |
+| `@Query(selector)`              |  ✅     |  ✅      |  ❌      |
+| `@Query(Type)`                  |  ✅     |  ✅      |  ❌      |
+| `@ContentChildred`              |  ✅     |  ✅      |  ❌      |
+| `@ContentChild`                 |  ✅     |  ✅      |  ❌      |
+| `@ViewChildren`                 |  ✅     |  ✅      |  ❌      |
+| `@ViewChild`                    |  ✅     |  ✅      |  ❌      |
+
+
+
+## Content Projection
+| Feature                         | Runtime | Spec     | Compiler |
+| ------------------------------- | ------- | -------- | -------- |
+| `<ng-content>`                  |  ✅     |  ✅      |  ✅      |
+| `<ng-content selector="...">`   |  ✅     |  ✅      |  ✅      |
+| container `projectAs`           |    ✅    |  ✅      |  ❌      |
+
+
+
+## Injection Features
+| Feature                             | Runtime | Spec     | Compiler |
+| ----------------------------------- | ------- | -------- | -------- |
+| `inject(Type)`                      |  ✅     |  ✅      |  ✅      |
+| `directiveInject(Type)`             |  ✅     |  ✅      |  ❌      |
+| `inject(Type, SkipSelf)`            |  ❌     |  ❌      |  ❌      |
+| `attribute('name')`                 |  ✅      |  ✅       |  ❌      |
+| `injectChangeDetectionRef()`        |  ✅     |  ✅      |  ❌      |
+| `injectElementRef()`                |  ✅     |  ✅      |  ✅      |
+| `injectViewContainerRef()`          |  ✅     |  ✅      |  ✅      |
+| `injectTemplateRef()`               |  ✅     |  ✅      |  ✅      |
+| default `inject()` with no injector |  ❌     |  ❌      |  ❌      |
+| sanitization with no injector       |  ✅     |  ✅      |  ❌      |
+
+
+
+## Change Detection
+| Feature                             | Runtime | 
+| ----------------------------------- | ------- | 
+| `markDirty()`                       |  ✅     | 
+| `detectChanges()`                   |  ✅     | 
+| `tick()`            |  ✅    | 
+| `attach()`                          |  ✅     | 
+| `detach()`                          |  ✅     | 
+| `ON_PUSH`                           |  ✅     | 
+| `ALWAYS`                            |  ✅    | 
+| `DIRTY`                        |  ✅    | 
+| `ATTACHED`                          |  ✅     | 
+
+
+
+## Bootstrap API
+| Feature                             | Runtime | 
+| ----------------------------------- | ------- | 
+| `renderComponent()`                 |  ✅     | 
+| `getHostElement()`                  |  ✅     | 
+| `Injector.create()`                 |  ❌     | 
+
+
+
+## I18N
+| Feature                             | Runtime | Spec     | Compiler |
+| ----------------------------------- | ------- | -------- | -------- |
+| translate text literals             |  ❌     |  ❌      |  ❌      |
+| rearrange text nodes                 |  ❌     |  ❌      |  ❌      |
+| ICU                                 |  ❌     |  ❌      |  ❌      |
+
+
+
+
+
+## `______Ref`s
+| Method                 | View Container Ref | Template Ref | Embeded View Ref | View Ref | Element Ref | Change Detection Ref |
+| ---------------------- | ------------------ | ------------ | ---------------- | -------- | ----------- | -------------------- |
+| `clear()`              |  ❌                | n/a          | n/a              | n/a      | n/a         | n/a                  |
+| `get()`                |  ❌                | n/a          | n/a              | n/a      | n/a         | n/a                  |
+| `createEmbededView()`  |  ✅                | ✅           | n/a              | n/a      | n/a         | n/a                  |
+| `createComponent()`    |  ✅                | n/a          | n/a              | n/a      | n/a         | n/a                  |
+| `insert()`             |  ✅                | n/a          | n/a              | n/a      | n/a         | n/a                  |
+| `move()`               |  ❌                | n/a          | n/a              | n/a      | n/a         | n/a                  |
+| `indexOf()`            |  ❌                | n/a          | n/a              | n/a      | n/a         | n/a                  |
+| `destroy()`            | n/a                | n/a          |  ❌              | ❌       | n/a         | n/a                  |
+| `destroyed`            | n/a                | n/a          |  ❌              | ❌       | n/a         | n/a                  |
+| `onDestroy()`          | n/a                | n/a          |  ❌              | ❌       | n/a         | n/a                  |
+| `markForCheck()`       | n/a                | n/a          |  ❌              | n/a      | n/a         | ✅                   |
+| `detach()`             |  ❌                | n/a          |  ❌              | n/a      | n/a         | ✅                   |
+| `detachChanges()`      | n/a                | n/a          |  ❌              | n/a      | n/a         | ✅                   |
+| `checkNoChanges()`     | n/a                | n/a          |  ❌              | n/a      | n/a         | ✅                   |
+| `reattach()`           | n/a                | n/a          |  ❌              | n/a      | n/a         | ✅                   |
+| `nativeElement()`      | n/a                | n/a          | n/a              | n/a      |  ✅         | n/a                  |
+
+## Missing Pieces
+- Sanitization ✅
+- Back patching in tree shakable way. ❌
+- attribute namespace ❌
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