New Twiddle

controllers.application\.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  Img_tag: Ember.Handlebars.Utils.escapeExpression('<img src="" onerror=alert();>'),
  
  Img_tag_with_tag:'<b>'+Ember.Handlebars.Utils.escapeExpression('<img src="" onerror=alert();>')+'</b>',
  
  withoutEscExpress: '<img src="" onerror=alert();>',
  
  withoutEscExpress_with_tag:'<b>'+'<img src="" onerror=alert();>'+'</b>',
  
});

templates.application\.hbs

<h1>With escapeExpression</h1>
<h2>Double braces</h2>
{{outlet}}
{{Img_tag}}
<br>
<br>
<h2>Triple braces</h2>
{{outlet}}
{{{Img_tag}}}
<hr>

<h1>With escapeExpression with tag</h1>
<h2>Double braces</h2>
{{outlet}}
{{Img_tag_with_tag}}
<h2>Triple braces</h2>
{{outlet}}
{{{Img_tag_with_tag}}}
<br>
<br>

<hr>

<h1>Without escapeExpression</h1>
<h2>Double braces</h2>
{{outlet}}
{{withoutEscExpress}}
<br>
<br>
<h2>Triple braces</h2>
{{outlet}}
Script executed here {{{withoutEscExpress}}}
<hr>

<h1>Without escapeExpression with tag</h1>
<h2>Double braces</h2>
{{outlet}}
{{withoutEscExpress_with_tag}}
<h2>Triple braces</h2>
{{outlet}}
Script executed here {{{withoutEscExpress_with_tag}}} 
<br>
<br>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}