LayoutTests/fast/multicol/progression-reverse.html

<style>
    div.test {
        border: solid silver;
        border-block-start-width: 2px;
        border-inline-end-width: 4px;
        border-block-end-width: 1px;
        border-inline-start-width: 3px;
        inline-size: 64px;
        block-size: 32px;
        -webkit-column-count: 2;
        -webkit-column-gap: 4px;
        -webkit-column-rule: 2px solid orange;
        -webkit-column-fill: auto;
        -webkit-column-progression: reverse;
        column-count: 2;
        column-gap: 4px;
        column-rule: 2px solid orange;
        column-fill: auto;
    }

    .writing-mode-lr div.test {
        -webkit-writing-mode: vertical-lr;
    }

    .writing-mode-rl div.test {
        -webkit-writing-mode: vertical-rl;
    }

    .writing-mode-tb div.test {
        -webkit-writing-mode: horizontal-tb;
    }

    .writing-mode-bt div.test {
        -webkit-writing-mode: horizontal-bt;
    }

    div.axis-vertical {
        -webkit-column-axis: vertical;
    }

    div.axis-horizontal {
        -webkit-column-axis: horizontal;
    }

    .writing-mode-tb div.axis-vertical, .writing-mode-bt div.axis-vertical,
    .writing-mode-lr div.axis-horizontal, .writing-mode-rl div.axis-horizontal {
        margin-block-end: 16px;
        margin-block-start: 96px;
    }

    .writing-mode-tb div.axis-horizontal, .writing-mode-bt div.axis-horizontal,
    .writing-mode-lr div.axis-vertical, .writing-mode-rl div.axis-vertical {
        margin-inline-start: 96px;
        margin-bottom: 16px;
        margin-top: 48px;
    }

    div.test > div {
        block-size: 20px;
        border-block-start: 4px dotted;
        border-inline-start: 2px dotted white;
    }

    div.test > div:nth-child(1) { background-color: #707; }
    div.test > div:nth-child(2) { background-color: #00f; }
    div.test > div:nth-child(3) { background-color: #0bf; }
    div.test > div:nth-child(4) { background-color: #086; }
</style>
<div class="writing-mode-tb">
    <div class="test axis-horizontal">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
    <div class="test axis-vertical">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
</div>
<div class="writing-mode-bt">
    <div class="test axis-horizontal">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
    <div class="test axis-vertical">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
</div>
<div class="writing-mode-lr">
    <div class="test axis-horizontal">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
    <div class="test axis-vertical">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
</div>
<div class="writing-mode-rl">
    <div class="test axis-horizontal">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
    <div class="test axis-vertical">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
</div>