Hi,
just because it is possible to add Ionic 4 in simple HTML file (taken from Ionic beta docs)
Ionicons CDN gives errors sometimes…
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://unpkg.com/@ionic/angular/css/ionic.min.css" />
<script src="https://unpkg.com/@ionic/core@latest/dist/ionic.js"></script>
<title>Basic Ionic 4 HTML page</title>
</head>
<body>
<!-- Default -->
<ion-badge>99</ion-badge>
<!-- Colors -->
<ion-badge color="primary">11</ion-badge>
<ion-badge color="secondary">22</ion-badge>
<ion-badge color="tertiary">33</ion-badge>
<ion-badge color="success">44</ion-badge>
<ion-badge color="warning">55</ion-badge>
<ion-badge color="danger">66</ion-badge>
<ion-button shape="round" color="primary" fill="outline">Hello World</ion-button>
<ion-button size="small">Small Button</ion-button>
<ion-card>
<ion-card-content>
<ion-card-title>Hello World</ion-card-title>
<p>The content for this card</p>
<ion-icon name="arrow-dropright-circle"></ion-icon>
<ion-icon name="american-football"></ion-icon>
</ion-card-content>
</ion-card>
<ion-checkbox color="primary" checked></ion-checkbox>
<ion-checkbox color="secondary"></ion-checkbox>
<ion-checkbox color="danger" checked></ion-checkbox>
<ion-checkbox color="light"></ion-checkbox>
<ion-checkbox color="dark" checked></ion-checkbox>
<ion-list>
<ion-item>
<ion-label>Date</ion-label>
<ion-datetime display-format="MM/DD/YYYY"></ion-datetime>
</ion-item>
<ion-item>
<ion-avatar slot="start">
<img src="https://raw.githubusercontent.com/ionic-team/ionic-preview-app/master/src/assets/img/avatar-frodo.jpg"></img>
</ion-avatar>
<ion-label>
<h2>Finn</h2>
<h3>I'm a big deal</h3>
<p>Listen, I've had a pretty messed up day...</p>
</ion-label>
</ion-item>
<ion-item>
<ion-range>
<ion-icon slot="start" size="small" name="sunny"></ion-icon>
<ion-icon slot="end" name="sunny"></ion-icon>
</ion-range>
</ion-item>
</ion-list>
<ion-item>
<ion-label>Hair Color</ion-label>
<ion-select value="brown" ok-text="Okay" cancel-text="Dismiss">
<ion-select-option value="brown">Brown</ion-select-option>
<ion-select-option value="blonde">Blonde</ion-select-option>
<ion-select-option value="black">Black</ion-select-option>
<ion-select-option value="red">Red</ion-select-option>
</ion-select>
</ion-item>
<ion-fab vertical="bottom" horizontal="end" slot="fixed">
<ion-fab-button>
<ion-icon name="add"></ion-icon>
</ion-fab-button>
</ion-fab>
<ion-slides pager="true">
<ion-slide>
<h1>Slide 1</h1>
</ion-slide>
<ion-slide>
<h1>Slide 2</h1>
</ion-slide>
<ion-slide>
<h1>Slide 3</h1>
</ion-slide>
</ion-slides>
<script src="https://unpkg.com/ionicons@4.0.0/dist/ionicons.js"></script>
</body>
</html>
Regards
Tom