New Twiddle

components.tagless\.hbs

<div ...attributes>i am tagless</div>

components.tagless\.js

import Component from '@ember/component';

export default class extends Component {
  tagName = '';
}

components.with-outer-tag\.hbs

i have an outer tag

components.with-outer-tag\.js

import Component from '@ember/component';

export default class extends Component {
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

templates.application\.hbs

<h1>Classic Components and classes</h1>

<h2>Outer Tag + angle bracket invocation</h2>
<p>Classic components with an outer tag accept <code>@class=</code> <i>and</i> <code>class=</code> and automtically apply them to the other tag. Example:</p>

<WithOuterTag @class="yo" class="hi" />

<hr />
<h2>Tagless + angle bracket invocation</h2>
<p>Classic components without an outer tag (i.e. that set <code>tagName: ''</code>), do not do anything with <code>@class=</code>, but will apply <code>class=</code> attributes passed in angle brackets to wherever <code>...attributes</code> is inside the component. Example:</p>

<Tagless @class="yo" class="hi" />

<hr />
<h2>Tagless + curly invocation</h2>
<p>
With curly bracket syntax, <code>class=</code> will NOT be applied to <code>...attributes</code>. Example:
</p>

{{tagless class="yo"}}
<hr />

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"
  }
}