Testing

components.glimmer-component\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';

export default class extends Component {
  @action
  outer() {
  	console.log('clicked outer');
  }
  
  @action
  inner() {
  	console.log('clicked inner');
  }
  
  @action
  innerStopPropagation(e) {
    e.stopPropagation();
  	console.log('clicked innerStopPropagation');
  }
  
  @action
  innerPreventDefault(e) {
    e.preventDefault();
  	console.log('clicked innerPreventDefault');
  }
}

controllers.application\.js

import Controller from '@ember/controller';

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

router\.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('other');
});

export default Router;

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

<GlimmerComponent />

templates.components.glimmer-component\.hbs

Attempt 1 - does not work
<br />
<LinkTo @route="other" {{on "click" this.outer}}>
	<button  {{on "click" this.inner}}>Inner</button> 
</LinkTo>

<br /><br />
Attempt 2 - does not work
<br />
<LinkTo @route="other" {{on "click" this.outer}}>
	<button  {{on "click" this.innerStopPropagation}}>Inner</button>
</LinkTo>

<br /><br />
Attempt 2.1 - does not work 
<br />
<LinkTo @route="other" {{on "click" this.outer}}>
	<button  {{on "click" this.innerPreventDefault}}>Inner</button>
</LinkTo>

<br /><br />
Attempt 3 - pseudo-works? the link gets the click but does not navigate
<br />
<LinkTo @route="other" {{on "click" this.outer}}>
	<button  {{action this.inner bubbles=false}}>Inner</button>
</LinkTo>


<br /><br />
Attempt 4 - does work
<br />
<LinkTo @route="other" {{action this.outer}}>
	<button  {{action this.inner bubbles=false}}>Inner</button> 
</LinkTo>

<br /><br />
Attempt 5 - does not work 
<br />
<LinkTo @route="other" {{action this.outer}}>
	<button {{action bubbles=false}}>Inner</button> 
</LinkTo>

<br /><br/>
Attempt 6
<div style="position:relative; background: lightgray">
	<LinkTo @route="other" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;"></LinkTo>
  <div style="position: relative">
  <p>Clicking here should navigate</p>
  <button style="position: relative" {{on "click" this.inner}}>Inner</button>
  </div>
</div>

templates.other\.hbs

I'm in the other template. Return <LinkTo @route="index">Home</LinkTo>

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"
  }
}