Cookie Trigger pattern.

Show a DOM element if browser cookies are disabled.

Example

If you do not see a message between the following START and END, you have cookies allowed and this pattern works.

START

Cookies are not enabled. You must enable cookies before you can log in.

END

<div class="portalMessage error pat-cookietrigger">
    Cookies are not enabled. You must enable cookies before you can log in.
</div>