Backwards compatibility for browsers that do not support this feature. You put your opening and closing parenthesis tokens within the "rp" tags and such browser

Backwards compatibility for browsers that do not support this feature. You put your opening and closing parenthesis tokens within the "rp" tags and such browsers will show the hints within those parentheses. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/rp https://developer.mozilla.org/en-US/docs/Web/HTML/Element/rp