JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.github.com/SteveSanderson/knockout/master/build/output/knockout-latest.debug.js"></script>
<script src="https://raw.github.com/ericmbarnard/Knockout-Validation/master/Src/knockout.validation.js"></script>
<fieldset class="create-fieldset complaint">
    <legend>Job Tasks</legend>
    <p class="form-group">
        <label for="TaskDescriptions">
            Task Description:<em>*</em></label>
        <textarea id="TaskDescriptions" name="TaskDescriptions" data-bind="value: task().description"></textarea>
    </p>
    <p class="form-group">
        <label for="TaskPriority">
            Task Priority:<em>*</em><span class="priority-info"></span></label>
        <input type="text" id="TaskPriority" class="narrow-text" name="TaskPriority" data-bind="value: task().priority" />
    </p>
    <p class="form-group">
        <label for="TaskComplete">
            Task Complete:</label>
        <input style="vertical-align: top;" name="TaskComplete" id="TaskComplete" type="checkbox"
            data-bind="checked: task().complete" />
        <button class="create-button" data-bind="click: addTask">
            Add</button>
    </p>
</fieldset>

CSS

.input-validation-error {
    background-color: red;    
}

JavaScript

ko.validation.configure({
    decorateElement: true,
    insertMessages: false,
    errorElementClass: 'input-validation-error'
});

function JobTask() {
    var self = this;

    self.description = ko.observable('').extend({
        required: true
    });
    self.priority = ko.observable('').extend({
        number: true,
        required: true
    });
    self.complete = ko.observable(false);
}

function CreateJobViewModel() {
    var self = this;

    self.task = ko.observable(new JobTask());

    self.taskErrors = ko.validation.group(self.task);
    self.addTask = function() {

        if (self.taskErrors().length) {
            console.log(self.taskErrors());
            self.taskErrors.showAllMessages();
        }
        else {
            
        }
    };

}

ko.applyBindings(new CreateJobViewModel());