All input text components support floating labels by adding ( .ui-float-label ) to wrapper class.
<div class="card" style="width: 100%">
    <h:form>
        <div class="grid ui-fluid mt-3 floatlabel-demo">
            <div class="col-12 md:col-6">
                <div class="field">
                    <span class="ui-float-label"> 
                        <p:inputText /> 
                        <p:outputLabel for="@previous" value="InputText" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label ui-input-icon-left"> 
                        <i class="pi pi-search" /> 
                        <p:inputText />
                        <p:outputLabel for="@previous" value="Left Icon" styleClass="ml-4" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label ui-input-icon-right"> 
                       <p:inputText /> 
                       <p:outputLabel for="@previous" value="Right Icon" /> 
                       <i class="pi pi-spin pi-spinner" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                       <p:inputMask mask="99/99/9999" /> 
                       <p:outputLabel for="@previous" value="InputMask" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                       <p:inputNumber /> 
                       <p:outputLabel for="@previous" value="InputNumber" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                          <p:chips /> 
                          <p:outputLabel for="@previous" value="Chips" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                       <p:colorPicker clearButton="true" closeButton="true"/> 
                       <p:outputLabel for="@previous" value="Color" />
                    </span>
                </div>
            </div>
            <div class="col-12 md:col-6">
                <div class="field">
                    <div class="ui-inputgroup">
                        <span class="ui-inputgroup-addon"> <i class="pi pi-user" />
                        </span> <span class="ui-float-label" style="width: 100%"> <p:inputText /> <p:outputLabel
                                for="@previous" value="InputGroup" />
                        </span>
                    </div>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                       <p:autoComplete /> 
                       <p:outputLabel for="@previous" value="AutoComplete" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                       <p:datePicker mask="true" pattern="dd.MM.yyyy" showIcon="true" showOnFocus="false" /> 
                       <p:outputLabel for="@previous" value="Datepicker" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                       <p:selectOneMenu id="cities" autoWidth="false">
                            <f:selectItem itemLabel="" itemValue="" />
                            <f:selectItem itemLabel="New York" itemValue="New York" />
                            <f:selectItem itemLabel="Rome" itemValue="Rome" />
                            <f:selectItem itemLabel="London" itemValue="London" />
                            <f:selectItem itemLabel="Istanbul" itemValue="Istanbul" />
                            <f:selectItem itemLabel="Paris" itemValue="Paris" />
                        </p:selectOneMenu> 
                        <p:outputLabel for="@previous" value="Dropdown" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                       <p:inputTextarea rows="3" cols="30" /> 
                       <p:outputLabel for="@previous" value="Textarea" />
                    </span>
                </div>
                <div class="field">
                    <span class="ui-float-label"> 
                       <p:password toggleMask="true" /> 
                       <p:outputLabel for="@previous" value="Password" />
                    </span>
                </div>
            </div>
        </div>
    </h:form>
</div>