CSS Live Demo: text-decoration-style Click the demo button below!
selector {
    text-decoration-style: solid | double | dotted | dashed | wavy
}
/* Keyword values */
text-decoration-style: solid;
text-decoration-style: double;
text-decoration-style: dotted;
text-decoration-style: dashed;
text-decoration-style: wavy;

/* Global values */
text-decoration-style: inherit;
text-decoration-style: initial;
text-decoration-style: revert;
text-decoration-style: revert-layer;
text-decoration-style: unset;
<p>The text-decoration-style property is set to wavy.</p>
p {
    text-decoration: underline;
    text-decoration-color: red;
    text-decoration-style: wavy;
}
Rendered Output