Default Select 
<select class="form-select" aria-label="Default select example">
    <option selected>Open this select menu
    </option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>
Disabled Select 
<select class="form-select" aria-label="Disabled select example" disabled="">
    <option selected="">Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>
Rounded Select 
<select class="form-select rounded-pill" aria-label="Default select example">
    <option selected>Open this select menu
    </option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>
Select Sizes 
<select class="form-select form-select-sm mb-3" aria-label=".form-select-sm example">
    <option selected="">Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select><select class="form-select mb-3" aria-label="Default select">
    <option selected>Open this select menu
    </option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>
<select class="form-select form-select-lg"
    aria-label=".form-select-lg example">
    <option selected="">Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>
Choices:
Single Select

Default

Option groups

Multiple Select

Default

With Remove Button

Option groups

Passing Through Options
Options added via config with no search
Email Address Only
Passing Unique Values
Multiple Attribute Select 
<select class="form-select" multiple="" aria-label="multiple select example">
    <option selected="">Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
</select>
Using Size Attribute 
<select class="form-select" size="4" aria-label="size 3 select example">
    <option selected="">Open this select menu</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
    <option value="4">Four</option>
    <option value="5">Five</option>
</select>