Add Raster Overlay to geojson.io

gejsonio-add-raster-overlay.js

javascript:(()=>{
  if (window.location.host!=='geojson.io') {
    alert('This bookmarlet only works on geojson.io');
    return;
  }
  const m = window.api.map;
  const xyz = prompt("Enter your XYZ Raster Tile URL to overlay");
  if (m.getLayer('overlay')) m.removeLayer('overlay');
  if (m.getSource('overlay')) m.removeSource('overlay');
  m.addSource('overlay', {type: 'raster', tileSize: 256, tiles: [xyz]});
  m.addLayer({id: 'overlay', source: 'overlay', type: 'raster'});
})()