examples/openlayers/openlayers-tiles.html

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>OpenLayers Vector Tiles</title>

  <!-- CSS/JS for OpenLayers map  -->
  <link rel="stylesheet" href="https://openlayers.org/en/v6.1.1/css/ol.css" type="text/css">
  <script src="https://openlayers.org/en/v6.1.1/build/ol.js"></script>

  <style>
    body {
      padding: 0;
      margin: 0;
    }
    html, body, #map {
      height: 100%;
      width: 100%;
      font-family: sans-serif;
    }
    #meta {
      background-color: rgba(255,255,255,0.75);
      color: black;
      z-index: 2;
      position: absolute;
      top: 10px;
      left: 20px;
      padding: 10px 20px;
      margin: 0;
    }
  </style>
</head>

<body>

<div id="meta">
  <h2>OpenLayers Tile Map</h2>
  <ul>
    <li><a href="https://openlayers.org/">OpenLayers</a></li>
  </ul>
</div>

<div id="map"></div>

<script>

var vectorServer = "http://localhost:7800/";
var vectorSourceLayer = "public.ne_50m_admin_0_countries";
var vectorProps = "?properties=name,type,pop_est"
var vectorUrl = vectorServer + vectorSourceLayer + "/{z}/{x}/{y}.pbf" + vectorProps;

var vectorStyle = new ol.style.Style({
  stroke: new ol.style.Stroke({
    width: 2,
    color: "#ff00ff99"
  }),
  fill: new ol.style.Fill({
    color: "#ff00ff33"
  })
});

var vectorLayer = new ol.layer.VectorTile({
    source: new ol.source.VectorTile({
      format: new ol.format.MVT(),
      url: vectorUrl
    }),
    style: vectorStyle
  });

var baseLayer = new ol.layer.Tile({
  source: new ol.source.XYZ({
    url: "https://maps.wikimedia.org/osm-intl/{z}/{x}/{y}.png"
  })
});

var map = new ol.Map({
  target: 'map',
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  }),
  layers: [baseLayer, vectorLayer]
});


</script>

</body>
</html>