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HTML

              
                <div class="lg:grid lg:grid-cols-4 p-4">
  <div class="mb-4 lg:mb-0 lg:col-span-3">
    <div id="app">
      <div class="text-white flex items-center justify-center space-x-2 mb-3">
        <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor">
          <path fill-rule="evenodd" d="M10 2a4 4 0 00-4 4v1H5a1 1 0 00-.994.89l-1 9A1 1 0 004 18h12a1 1 0 00.994-1.11l-1-9A1 1 0 0015 7h-1V6a4 4 0 00-4-4zm2 5V6a2 2 0 10-4 0v1h4zm-6 3a1 1 0 112 0 1 1 0 01-2 0zm7-1a1 1 0 100 2 1 1 0 000-2z" clip-rule="evenodd" />
        </svg>
        <span class="text-sm" v-text="`${cartCount} items`">0 items</span>
      </div>
      <div id="buttons" class="flex flex-wrap flex-col gap-4 md:flex-row justify-center">
        <button class="py-2 px-3 rounded bg-purple-300" type="button" onclick="customEvent('add-to-cart', { product_id: '1' })">Add To Cart 1</button>

        <button class="py-2 px-3 rounded bg-purple-300" type="button" onclick="customEvent('add-to-cart', { product_id: '2' })">Add To Cart 2</button>

        <button class="py-2 px-3 rounded bg-purple-300" type="button" onclick="customEvent('add-to-cart', { product_id: '3' })">Add To Cart 3</button>
      </div>
    </div>

    <hr class="my-6 border-purple-600 opacity-50 max-w-lg mx-auto">

    <div class="text-center">
      <button class="py-2 px-3 rounded bg-green-300" type="button" onclick="addNewButton()">Add new Button</button>
    </div>
  </div>


  <!-- for logging I'm using AlpineJS, it also demonstrates the versatality of CustomEvents -->
  <div class="bg-white rounded p-3 opacity-90 overflow-y-scroll" x-data="{ logs: [] }" x-on:log.window="logs.push(event);$nextTick(() => $el.scrollTop = $el.scrollHeight)" style="max-height: 80vh">
    <p class="font-semibold">
      Here you'll find the logs of the custom events
    </p>
    <hr class="my-1">
    <div class="space-y-1">
      <template x-for="log in logs">
        <code class="block" x-html="JSON.stringify(log.detail)"></code>
      </template>
    </div>
  </div>
</div>

              
            
!

CSS

              
                :root {
  --one: #833ab4;
  --two: #fd1d1d;
  --three: #fcb045;
}


html, body {
  min-height: 100%;
  height: 100%;
}

body {
  background: linear-gradient(120deg, var(--one) 0%, var(--two) 50%, var(--three) 100%);
  height: 100vh;
  width: 100vw;
  position: absolute;
  z-index: -1;
}

              
            
!

JS

              
                // This function must be initialized outside of the Vue instance!

function customEvent(name, payload) {

  const event = new CustomEvent(name, {
    detail: payload
  })

  window.dispatchEvent(event)
  
  // ignore everthing after here, I'm just using another
  // custom event for the logging
  const logEvent = new CustomEvent('log', {
    detail: {
      name: name,
      payload: payload
    }
  })

  window.dispatchEvent(logEvent)
}



const app = new Vue({
  el: '#app',
  data: {
    cartItems: []
  },
  methods: {
    addToCart(productId) {
      this.cartItems.push(productId)
    }
  },
  computed: {
    cartCount() {
      return this.cartItems.length
    }
  },
  created() {
    // Add a global event listener with the name 'add-to-cart'
    // `e` contains the complete event, with the details
    // This listener should be registered in the main Vue instance
    // and delegate to the Cart:

    window.addEventListener('add-to-cart', e => this.addToCart(e.detail.product_id))
  }
})




// For demonstration purposes
let count = 4

function addNewButton() {
  const appEl = document.getElementById('buttons')
  
  appEl.insertAdjacentHTML('beforeend', `<button class="py-2 px-3 rounded bg-purple-300" type="button" onclick="customEvent('add-to-cart', { product_id: '${count}' })">Add To Cart ${count}</button>`)
  
  count++
  
  customEvent('add-new-button')
}
              
            
!
999px

Console