CSS Font Manipulation vs Opentype.js

font-family: "Varela Round", sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-rendering: optimizeLegibility;
    

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi ullamcorper congue elit, a venenatis lorem molestie in. Suspendisse posuere sed elit quis cursus. Sed vitae nulla turpis.