pinafore/routes/_components/dialog/components/VideoDialog.html

<ModalDialog
  :id
  :label
  background="var(--muted-modal-bg)"
  muted="true"
  className="video-modal-dialog"
>
  <video :poster
         :src
         :width
         :height
         aria-label="Video: {{description || ''}}"
         controls
  />
</ModalDialog>
<style>
  :global(.video-modal-dialog video) {
    object-fit: contain;
    max-width: calc(100vw - 20px);
    max-height: calc(100% - 20px);
    overflow: hidden;
  }
</style>
<script>
  import ModalDialog from './ModalDialog.html'
  import { show } from '../helpers/showDialog'
  import { oncreate } from '../helpers/onCreateDialog'

  export default {
    oncreate,
    components: {
      ModalDialog
    },
    methods: {
      show
    }
  }
</script>