<!DOCTYPE html>
<meta charset="utf-8"/>
<style>
    @font-face {
        font-family: TestFont;
        src: url("ligature.woff");
    }
    span {
        border: blue solid;
        font-family: TestFont;
        text-rendering: optimizeLegibility;
        font-size: 100px;
        color: green;
    }
</style>
<body>
    The blue box should contain ▲■■▲.<br>
    <span>00_a0_aa</span>
</body>