Demo

<mapml-viewer projection="OSMTILE" zoom="15" lon="-75.7" lat="45.42" controls="">
  <map-layer label="OpenStreetMap" src="../data/osm.mapml" checked></map-layer>
  <map-layer label="Points" checked>
    <map-meta name="projection" content="OSMTILE"></map-meta>
    <map-feature>
      
      <map-geometry cs="gcrs">
        <map-geometrycollection>
          <map-point class="class1">
            <map-coordinates>-75.6978285 45.4202251</map-coordinates>
          </map-point>
          <map-point class="class2">
            <map-coordinates>-75.7002854 45.4199465</map-coordinates>
          </map-point>
          <map-point class="class3">
            <map-coordinates>-75.6984723 45.4179207</map-coordinates>
          </map-point>
        </map-geometrycollection>
      </map-geometry>
    </map-feature>
    <map-style>.class1{stroke: #73A9AD;stroke-width: 4px;fill: none;fill-opacity: 1;} .class2{stroke: #000000;stroke-width: 2px;fill: #6b6a6a;fill-opacity: 1;} .class3{stroke: #5392bd;fill: #5392bd;fill-opacity: 0.7;}</map-style>
  </map-layer>
</mapml-viewer>

MapML Demo: <map-style>