isVisible Changes `display` without removing from DOM

components.show-hide-trigger.js

import Ember from 'ember';

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

components.show-hide-when-shown.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'want-gone-from-dom-when-hidden-but-is-only-display-none'
});

components.show-hide.js

import Ember from 'ember';

export default Ember.Component.extend({
  isShowing: true,
  actions: {
    show() {
      this.set('isShowing', true);
    },
    hide() {
      this.set('isShowing', false);
    },
    toggle() {
      this.toggleProperty('isShowing');
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
{{#show-hide as |sh|}}
  {{sh.trigger}}
  {{#sh.when-shown}}I'm visible!{{/sh.when-shown}}
{{/show-hide}}

templates.components.show-hide-trigger.hbs

<button onclick={{action toggle}}>Toggle Visibility</button>

templates.components.show-hide-when-shown.hbs

{{yield}}

templates.components.show-hide.hbs

{{yield (hash
  when-shown=(component "show-hide-when-shown" isVisible=isShowing)
  trigger=(component "show-hide-trigger" toggle=(action "toggle"))
)}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}