chromium/third_party/blink/web_tests/external/wpt/mathml/presentation-markup/operators/support/operator-dictionary-tests.css

@font-face {
    font-family: operators;
    src: url("/fonts/math/operators.woff");
}
math, math * {
    font-family: operators;
    /* Use large enough font-size so that 1/18em = 2.77px > epsilon and
       one can really distinguish lspace/rspace values. */
    font-size: 50px;
}