System Fonts enqueues a stylesheet that lets you use the native font on each operating system and defines a system-ui css @font-face that you can use on the customizer, your theme’s settings or your own code. Usage example The Twenty Seventeen theme uses this css selector for the body text: body, button, input, select, textarea { font-family: “Libre Franklin”, “Helvetica Neue”, helvetica, arial, sans-serif; } We are going to replace it with the default system font. In you WordPress site, go to Appearance > Customize > Additional CSS and paste this code body, button, input, select, textarea { font-family: system-ui; } Appart from them font-family, there are other font-properties available: font-style: normal or italic; font-weight: 300 (light), 400 (regular), 500 (medium), 700 (bold); For example this is the code make an element’s text semibold and cursive: #my-element { font-family: system-ui; font-weight: 500; font-style: italic; }
