-webkit-tap-highlight-color

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

-webkit-tap-highlight-color is a non-standard CSS property that sets the color of the highlight that appears over a link while it's being tapped. The highlighting indicates to the user that their tap is being successfully recognized, and indicates which element they're tapping on.

css

-webkit-tap-highlight-color: red;
-webkit-tap-highlight-color: transparent; /* for removing the highlight */

/* Global values */
-webkit-tap-highlight-color: inherit;
-webkit-tap-highlight-color: initial;
-webkit-tap-highlight-color: revert;
-webkit-tap-highlight-color: revert-layer;
-webkit-tap-highlight-color: unset;