| web font fallback - performance

[uto-usui]

sample

@font-face {
  font-family: "Open Sans Regular";
  font-weight: 400;
  font-style: normal;
  src: url("fonts/OpenSans-Regular-BasicLatin.woff2") format("woff2");
  font-display: swap;
}

https://coliss.com/articles/build-websites/operation/css/about-font-display.html
https://codepen.io/lig-dsktschy/pen/wQZpQX