input[type="search"] {
-webkit-box-sizing: content-box;
-moz-box-sizing: content-box;
box-sizing: content-box;
-webkit-appearance: searchfield;
}
input[type="search"]::-webkit-search-cancel-button {
-webkit-appearance: searchfield-cancel-button;
}
works for me on Chrome (on my Mac, but not on my iPhone…)