Focus In/Out DOM versus Component Methods

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  log: [],
  
  actions: {
    domFocusIn({ target }) {
      this.set('log', [...this.log, `DOM Focus In: ${target.id}`]);
    },
    domFocusOut({ target }) {
      this.set('log', [...this.log, `DOM Focus Out: ${target.id}`]);
    },
    componentFocusIn({ target }) {
      this.set('log', [...this.log, `Component Focus In: ${target.id}`]);
    },
    componentFocusOut({ target }) {
      this.set('log', [...this.log, `Component Focus Out: ${target.id}`]);
    } 
  } 
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.container {
  border: 1px solid lightblue;
  padding: 10px;
}

.child {
  padding: 10px;
  margin: 10px;
}

templates.application.hbs

<h2>onfocusin/onfocusout attributes (doesn't work!)</h2>

<div 
	class="container" 
  onfocusin={{action "domFocusIn"}} 
  onfocusout={{action "domFocusOut"}}
 >
  <input class="child" id="one-A" value="One A" />
  <input class="child" id="one-B" value="One B" />
</div>

<h2>focusIn/focusOut methods (works!)</h2>

<MyComponent 
  class="container"
  @focusIn={{action "componentFocusIn"}} 
  @focusOut={{action "componentFocusOut"}}
 >
  <input class="child" id="one-A" value="One A" />
  <input class="child" id="one-B" value="One B" />
</MyComponent>

{{#each log as |line|}}
  {{line}}<br>
{{/each}}

templates.components.my-component.hbs

{{yield}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}