14.3 #Input.disabled Disabled:

Toggle example guides Toggle HTML markup

.sf-input

Html 
    <div class="sf-input">
        <label class="sf-input__label" for="input-6">
            <span>Input title</span>
        </label>
        <input type="text" class="sf-input__field" disabled value="User name" id="input-6" />
    </div>