Demo

<mapml-viewer projection="CBMTILE" zoom="4" lat="76" lon="-130" controls="">
  <layer- label="CBMT" src="../data/cbmtile-cbmt.mapml" checked="" hidden=""></layer->
  <layer- label="Permanent snow and ice (prob. 94% or more)" checked="">
    <map-link href="https://datacube.services.geo.ca/ows/msi?SERVICE=WMS&REQUEST=GetCapabilities&VERSION=1.3.0" rel="license" title="Open Government License"></map-link>
    <map-link rel="legend" href="https://datacube.services.geo.ca/assets/legend/legend_msi_binary.png" sizes="150x33" height="33" width="150" title="legend" type="image/png"></map-link>
    <map-extent units="CBMTILE" checked>
      <map-input name="z" type="zoom" value="25" min="4" max="25"></map-input>
      <map-input name="xmin" type="location" rel="map" position="top-left" axis="easting" units="pcrs" min="-6105785.728719063" max="6174630.753072981"></map-input>
      <map-input name="ymin" type="location" rel="map" position="bottom-left" axis="northing" units="pcrs" min="-1692155.9568245453" max="4482681.2054050295"></map-input>
      <map-input name="xmax" type="location" rel="map" position="top-right" axis="easting" units="pcrs" min="-6105785.728719063" max="6174630.753072981"></map-input>
      <map-input name="ymax" type="location" rel="map" position="top-left" axis="northing" units="pcrs" min="-1692155.9568245453" max="4482681.2054050295"></map-input>
      <map-input name="w" type="width" min="0" max="10000"></map-input>
      <map-input name="h" type="height" min="0" max="10000"></map-input>
      <map-select id="timeID" name="time">
        <map-option>2000-08-15T00:00:00Z</map-option>
        <map-option>2001-08-15T00:00:00Z</map-option>
        <map-option>2002-08-15T00:00:00Z</map-option>
        <map-option>2003-08-15T00:00:00Z</map-option>
        <map-option>2004-08-15T00:00:00Z</map-option>
        <map-option>2005-08-15T00:00:00Z</map-option>
        <map-option>2006-08-15T00:00:00Z</map-option>
        <map-option>2007-08-15T00:00:00Z</map-option>
        <map-option>2008-08-15T00:00:00Z</map-option>
        <map-option>2009-08-15T00:00:00Z</map-option>
        <map-option>2010-08-15T00:00:00Z</map-option>
        <map-option>2011-08-15T00:00:00Z</map-option>
        <map-option>2012-08-15T00:00:00Z</map-option>
        <map-option>2013-08-15T00:00:00Z</map-option>
        <map-option>2014-08-15T00:00:00Z</map-option>
        <map-option>2015-08-15T00:00:00Z</map-option>
        <map-option>2016-08-15T00:00:00Z</map-option>
        <map-option>2017-08-15T00:00:00Z</map-option>
        <map-option>2018-08-15T00:00:00Z</map-option>
        <map-option>2019-08-15T00:00:00Z</map-option>
        <map-option>2020-08-15T00:00:00Z</map-option>        
      </map-select>
      <map-link tref="https://datacube.services.geo.ca/ows/msi?SERVICE=WMS&REQUEST=GetMap&FORMAT=image/png&TRANSPARENT=TRUE&STYLES=msi-binary&VERSION=1.3.0&LAYERS=msi-94-or-more&WIDTH={w}&HEIGHT={h}&CRS=EPSG:3978&BBOX={xmin},{ymin},{xmax},{ymax}&TIME={time}" rel="image"></map-link>
      <map-link tref="legend_query_msi-94-plus.mapml?BBOX={xmin},{ymin},{xmax},{ymax}&TIME={time}" rel="query"></map-link>
    </map-extent>
  </layer->
</mapml-viewer>

MapML Demo: <map-select>