<div {{bindAttr class=":notification-inner type"}}>
    <div {{action hide}} class="close">
        {{svg "icons/cross-fat"}}
    </div>
    {{message}}
</div>

<div {{bind-attr class=":notification-inner type"}}>
    <div {{action hide}} class="close">
        {{svg "icons/cross-fat"}}
    </div>
    {{message}}
</div>

Replace bindAttr helper with bind-attr
Replace bindAttr helper with bind-attr
