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OpenStreetMap Access Blocked Referer is required

var osmUrl='https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
const osmAttrib = '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
var osm = new L.TileLayer(osmUrl, {
    minZoom: 6,
    maxZoom: 18,
    attribution: osmAttrib,
    referrerPolicy: 'strict-origin-when-cross-origin'
});

<html>
  <head>
    <meta name="referrer" content="no-referrer-when-downgrade">

Web References

Blocked tiles