when i turn on the web gl in after apk export somewhere fonts are not suported. why?

hello everyone

in my game, when I turn oi web gl and i run it in apk my fonts in some where is not supported and somewhere it is true!

I add@font-face { font-family: 'my font'; src: url('fonts/my font.ttf'); format('truetype'); } in index.html file and I had made font folder with font file too.

please help me.

thanks a lot