Attribute selector fails on suffix selector (dollar sign)

[Jesmaster]

I'm trying to select all divs with an id ending in something. When I try the [$=] syntax I'm getting an Error: Unexpected value: = error message. The starting with selector [^=] works fine. Below is a simple example.

<script src="https://unpkg.com/[email protected]"></script>
<div _="init get <div[id$='ending-with']/> log its innerHTML">
  <div id="test-ending-with">Test</div>
  <div id="test-2-ending-with">Test</div>
</div>