Html5 skylight missing

Hi everyone, i am new to Unreal Engine… (I’m using Unreal Engine 4.23)
can someone help me regarding some issue that i have after i packaging my project to Html5 format

why that after i open the Html5 file its looks like its missing the skylight?

this is what its shows in ue4 using Html priview

But after i packaging the project to Html5 and open it using chrome browser its shows different

its look likes the skylight is missing

can someone help me with this problem?