Compruebe si la familia de fuentes está honrada - Trucos CSS

function checkFont(strFamily) ( var objDiv = document.createElement('div'); objDiv.style.fontFamily = strFamily; objDiv.appendChild(document.createTextNode('FONT TEST')); if (window.getComputedStyle) ( return window.getComputedStyle(objDiv, null).getPropertyValue('font-family') === strFamily; ) return objDiv.currentStyle.fontFamily === strFamily; )

Uso

var iconFontHonored = checkFont('icomoon');