También defina la propiedad estándar Clip de fondo para la compatibilidad
background-clip: border-box;
__goldenFrag__
background-clip: border-box;.heading-secondary {
font-size: 3.5rem;
text-transform: uppercase;
font-weight: 700;
display: inline-block;
background-image: linear-gradient(to right, $color-primary-light, $color-primary-dark);
background-clip: text;
-webkit-background-clip: text;
color: transparent;
letter-spacing: 0.2rem;
transition: all 0.2s;/* Keyword values */
background-clip: border-box;
background-clip: padding-box;
background-clip: content-box;
background-clip: text;
/* Global values */
background-clip: inherit;
background-clip: initial;
background-clip: revert;
background-clip: unset;