a {
    /* transition */
    -webkit-transition: all 1s;
    -o-transition: all 1s;
    transition: all 1s;
    height: -webkit-calc(/* comment before */100% - /* comment inside */ 10px/* comment after */);
    height: calc(/* comment before */100% - /* comment inside */ 10px/* comment after */);
}

/* placeholder */
::-webkit-input-placeholder { }
::placeholder { }
