<!doctype html>
<style>
    body * {
        border: 5px solid red;
        padding: 5px;
        clear: both;
    }

    span {
        display: inline-block;
        width: 200px;
        border-color: green;
    }

    .float {
        float: left;
    }

    #container {
        width: 150px;
        border-color: blue;
    }

    #container::after {
        content: ".";
        clear: both;
        height: 0;
        width: 0;
        display: block;
        visibility: hidden;
    }

    /* 
        fit-content and min-content in this test should both do float like
        shrink wrapping.
    */
    .fit-content,
    .min-content {
        float: left;
    }

    /*
        max-content acts as though no line breaks were taken.
    */
    .max-content {
        white-space: nowrap;
        display: inline-block;
    }

</style>

<div id="container">

    <div class="min-content">
        <span>Min Content</span> on this box.
    </div>

    <div class="max-content">
        <span>Max Content</span> on this box.
    </div>

    <div class="float">
        <span>Float</span> on this box.
    </div>

    <div>
        <span>Fill Available</span> on this box.
    </div>

    <div class="fit-content">
        <span>Fit Content</span> on this box.
    </div>

</div>