tile_schema.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset=utf-8>
    <title>Canvas Tiles</title>

    <script src="ol/v4.4.1/ol.js"></script>
    
    <!-- style -->
    <link rel="stylesheet" href="ol/v4.4.1/ol.css">

    <style type="text/css">

      /* for full page map */
      html, body {
        margin: 0;
        height: 100%;

        font-family: 'Open Sans', sans-serif;
        font-size: 12px;
      }
      #map {
        position: absolute;
        top: 0;
        bottom: 0;
        width: 100%;
      }
    </style>

  </head>
  <body>
    <div id="map" class="map"></div>

    <script>

      var osmSource = new ol.source.OSM();

      // OSM BR
      var osm_br = new ol.source.XYZ({
        url: 'https://tile.openstreetmap.bzh/br/{z}/{x}/{y}.png'
      });

      var map = new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: osm_br
          }),
          new ol.layer.Tile({
            source: new ol.source.TileDebug({
              projection: 'EPSG:3857',
              tileGrid: osm_br.getTileGrid()
            })
          })
        ],
        target: 'map',
        controls: ol.control.defaults({
          attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
            collapsible: false
          })
        }),
        view: new ol.View({
          center: ol.proj.transform(
              [-2.15, 48.50], 'EPSG:4326', 'EPSG:3857'),
          zoom: 8
        })
      });
    </script>
  </body>
</html>