How can I set the background color for the Map box map before tiles load on a web application?

Mappls APIs & SDKs Mappls Web Maps
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To set the background color for a Mappls map, you can specify the background Color property during map initialization. This color will be visible while tiles are loading as the user pans.

{
    backgroundColor: '#fff'
}

For more details, you can refer to: mappls-web-maps-js/docs/V3.0/mapProperties.md at main · mappls-api/mappls-web-maps-js · GitHub