There is no accessible name for the dropdown header.

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[replace me with a short description of issue]

Steps to reproduce:

1. Launch URL: Dropdown header | Selectize on Chrome browser.
2. Home page appears.
3. Navigate to selectize plugin demos on left and expand
4. Navigate to dropdown header and press enter
5. Turn on accessibility insights for web and verify the issue

Expected result:
There should be an accessible name for the dropdown header.
Ex: Screen reader should announce as "dropdown header combo box expanded".

Actual result:
There is no accessible name for the dropdown header element.
Observation:
Screen reader announces as edit blank

[you can add explanations here of the context/what you were trying to
do, and if you have findings about what the cause might be]