form-control class to the inputdisabled to disable input field.value="VALUE" to set predefined value.readonly to set field readonly.placeholder="..." to input area.maxlength="6" to input area.minlength="5" to input area.input type="text"input type="password"input type="tel"input type="email"input type="url"input type="search"input type="number"input type="datetime-local"input type="date"input type="time"input type="week"input type="month"input type="color"input type="range".custom-select classmultiple to the field.input-group-prepend class to the div.input-group-append class to the div.form-control-file class to the input.custom-file-input class to the input.input-group-prepend class to the div.input-group-append class to the divfloat-left class to the texttext-center class to the textfloat-right class to the textis-valid class to the inputis-invalid class to the inputform-horizontal class to the inputform-horizontal class to the input