Blank preview and map about qgis2web HOT 5 CLOSED

See the WIKI for supported styles https://qgis2web.github.io/qgis2web/#SetStyles
If you can't solve it, send your project in a zip.
Thank you.

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The layer shows ok, this is not the issue. What doesn't show is the map underneath, in this case, leaflet

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What style are you using? Categorized, with expressions, graduated?
You should also post the error you find in the browser console. Otherwise I can't help you.

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Sorry, I'm very newbie at QGIS but the issue appears even when I don't load any layer and only ask for the background map

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It is normal for the preview to be white and empty if you do not insert layers into the project.
If you are a beginner you could make your way with this guide which I consider complete https://www.qgistutorials.com/en/docs/3/web_mapping_with_qgis2web.html

If you want to insert a background map insert it as xyz layer.
Here you will find the guide to insert the base map:
https://qgis2web.github.io/qgis2web/#setBasemaps
Here you will find some links:
https://hatarilabs.com/ih-en/how-to-add-a-google-map-in-qgis-3-tutorial

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