Empty page when including css and js from CDN


When i’m including
<script src="https://unpkg.com/@ionic/core@4.0.0/dist/ionic.js" /> in a simple html file, the page loads blank? If i remove the js include line, atleast i can see the output without CSS being applied. I even tried to change from CDN to local, still empty page. Am i missing something??

   <link href="https://unpkg.com/@ionic/core@4.0.0/css/ionic.bundle.css" rel="stylesheet">
   <script src="https://unpkg.com/@ionic/core@4.0.0/dist/ionic.js" />

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