Demo

<mapml-viewer projection="CBMTILE" lat="60" lon="-95" zoom="2" controls>
    <layer- label="Toporama" checked>
      <map-extent units="CBMTILE" checked hidden>
        
        
        <map-input name="w" type="width"></map-input>
        <map-input name="h" type="height"></map-input>
        
        
        <map-input name="xmin" type="location" units="pcrs" position="top-left" axis="easting" min="-7786477" max="7148753" ></map-input>
        <map-input name="ymin" type="location" units="pcrs" position="bottom-left" axis="northing" min="-927808" max="7928344"></map-input>
         
        <map-input name="xmax" type="location" units="pcrs" position="top-right" axis="easting" min="-7786477" max="7148753"></map-input>
        <map-input name="ymax" type="location" units="pcrs" position="top-left" axis="northing" min="-927808" max="7928344"></map-input>
        <map-link rel="image" tref="https://maps.geogratis.gc.ca/wms/toporama_en?SERVICE=WMS&REQUEST=GetMap&FORMAT=image/jpeg&TRANSPARENT=FALSE&STYLES=&VERSION=1.3.0&LAYERS=WMS-Toporama&WIDTH={w}&HEIGHT={h}&CRS=EPSG:3978&BBOX={xmin},{ymin},{xmax},{ymax}"></map-link>
      </map-extent>
    </layer->
    <layer- label="Canada Base Map Tiles">
      <map-extent units="CBMTILE" checked hidden>
        
        <map-input name="z" type="zoom" value="17" min="0" max="17"></map-input>
        
        
        <map-input name="y" type="location" units="tilematrix" axis="row" min="29750" max="34475"></map-input>
        <map-input name="x" type="location" units="tilematrix" axis="column" min="26484" max="32463"></map-input>
        <map-link rel="tile" tref="https://geoappext.nrcan.gc.ca/arcgis/rest/services/BaseMaps/CBMT3978/MapServer/tile/{z}/{y}/{x}?m4h=t"></map-link>
      </map-extent>
    </layer->
</mapml-viewer>

MapML Demo: <map-input>