CSS 라이브 데모: text-emphasis-color 데모 버튼을 클릭해 보세요!
selector {
    text-emphasis-color: <color>
}
/* <color> 값 */
text-emphasis-color: currentcolor;
text-emphasis-color: red;
text-emphasis-color: #00a0e9;
text-emphasis-color: rgb(255, 255, 128);
text-emphasis-color: rgba(255, 255, 128, 0.5);
text-emphasis-color: transparent;

/* 글로벌 값 */
text-emphasis-color: inherit;
text-emphasis-color: initial;
text-emphasis-color: revert;
text-emphasis-color: revert-layer;
text-emphasis-color: unset;
p span {
    text-emphasis-style: triangle;
    text-emphasis-color: red;
}
<p>텍스트에 <span>강조 표시</span>가 있습니다.</p>
실제 적용 모습