Adding Dropdown Arrow for Chosen Plugin in Multiselect Mode

I use the jQuery Chosen plugin in a web application, and recently got the request to display a dropdown arrow in multiselect mode.

I found an answer on SO regarding styling of the dropdown arrow, but that covered only singleselect mode. At least a starting point 😉

Within minutes, I had a CSS-only solution for this particular problem:

<style type="text/css">
.chosen-container-multi.chosen-container .chosen-choices::after {
    background: url(@Url.Content("~/Content/chosen-sprite.png")) no-repeat 3px 4px;
    width: 16px;
    height: 100%;
    content: " ";
    position: absolute;
    right: 0;
    background-color: lightgray;
}
</style>

(Note that this is an ASP.Net MVC application, and @Url.Content() computes the URL relative to application root.)

Only after I solved this, I found that there is a closed (and unresolved) issue on github from 2011, with comments up to 2016, but no solution to a valid feature request…

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