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Description
Currently, the text/html; subtype=mapml format (also used by the layer preview link) sends "remote" MapML, i.e. a link to the remote text/mapml document for the layer. It should be possible to request an HTML preview document that contains the layer MapML representation inline, which in may be able to provide a DOM API over that content, which is not likely going to be the case for remote content.
Remote content link:
<html>
<head>
<title>Current Conditions</title>
<meta charset="utf-8">
<script type="module" src="https://.../geoserver/mapml/viewer/widget/mapml.js"></script>
<style>...</style>
</head>
<body>
<mapml-viewer projection="CBMTILE" zoom="3" lat="64.88778217676385" lon="-91.29542462849209" controls>
<map-layer label="Current Conditions"
src="https://.../geoserver/msc/wms?LAYERS=CURRENT_CONDITIONS&BBOX=-4267682.0%2C-370965.0%2C4622336.0%2C3847163.0&HEIGHT=768&WIDTH=364&SRS=MapML%3ACBMTILE&STYLES=&FORMAT=text%2Fmapml&format_options=mapml-wms-format%3Aimage%2Fpng&SERVICE=WMS&REQUEST=GetMap&VERSION=1.3.0"
checked></map-layer>
</mapml-viewer>
</body>
</html>Equivalent inline MapML content:
<html>
<head>
<title>Current Conditions</title>
<meta charset="utf-8">
<script type="module" src="https://.../geoserver/mapml/viewer/widget/mapml.js"></script>
<style>...</style>
</head>
<body>
<mapml-viewer projection="CBMTILE" zoom="3" lat="64.88778217676385" lon="-91.29542462849209" controls>
<map-layer label="Current Conditions" checked>
<map-link rel="license" href="https://eccc-msc.github.io/open-data/licence/readme_en/" title="Environment and Climate Change Canada Data Servers End-use Licence"></map-link>
<map-link rel="alternate" projection="OSMTILE" href="https://.../geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AOSMTILE&service=WMS&bbox=-1.9771353430346526E7%2C3550701.251005205%2C2.0000184074674536E7%2C1.8524695031846646E7&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>
<map-link rel="alternate" projection="APSTILE" href="https://.../geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AAPSTILE&service=WMS&bbox=-5266985.219718212%2C-5266985.219718212%2C9266985.219718212%2C9266985.219718212&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>
<map-link rel="alternate" projection="WGS84" href="https://.../geoserver/msc/wms?format_options=mapml-wms-format%3Aimage%2Fpng&request=GetMap&crs=MapML%3AWGS84&service=WMS&bbox=-177.60908974209215%2C30.366141302758248%2C179.66471039483983%2C83.72878702993546&format=text%2Fmapml&layers=CURRENT_CONDITIONS&width=364&version=1.3.0&height=768"></map-link>
<map-extent units="CBMTILE" checked hidden>
<map-input name="z" type="zoom" min="0" max="25"></map-input>
<map-input name="txmin" type="location" rel="tile" position="top-left" axis="easting" units="tilematrix" min="-4267682.0" max="4622336.0"></map-input>
<map-input name="tymin" type="location" rel="tile" position="bottom-left" axis="northing" units="tilematrix" min="-370965.0" max="3847163.0"></map-input>
<map-input name="txmax" type="location" rel="tile" position="top-right" axis="easting" units="tilematrix" min="-4267682.0" max="4622336.0"></map-input>
<map-input name="tymax" type="location" rel="tile" position="top-left" axis="northing" units="tilematrix" min="-370965.0" max="3847163.0"></map-input>
<map-link tref="https://geo.weather.gc.ca/geomet?request=GetMap&crs=EPSG:3978&service=WMS&bbox={txmin},{tymin},{txmax},{tymax}&layers=CURRENT_CONDITIONS&format=image/png&width=256&language=en&styles=&version=1.3.0&transparent=true&height=256" rel="tile"></map-link>
<map-input name="i" type="location" axis="i" units="tile"></map-input>
<map-input name="j" type="location" axis="j" units="tile"></map-input>
<map-link tref="https://geo.weather.gc.ca/geomet?request=GetFeatureInfo&query_layers=CURRENT_CONDITIONS&crs=EPSG:3978&bbox={txmin},{tymin},{txmax},{tymax}&language=en&version=1.3.0&transparent=true&service=WMS&layers=CURRENT_CONDITIONS&width=256&x={i}&feature_count=50&y={j}&styles=&info_format=text/plain&height=256" rel="query"></map-link>
</map-extent>
</map-layer>
</mapml-viewer>
</body>
</html>Note: I validated that an inline content layer can use the rel="alternate" projecton="..." links to change to a src-based remote content layer. I didn't try with alternate styles, but it's probably the case.
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