text-combine-horizontal: all test

HTML

<div>
    <p>A</p>
    <p>AB</p>
    <p>ABC</p>
    <p>ABCD</p>
    <p>ABCDE</p>
    <p>ABCDEF</p>
    <p>ABCDEFG</p>
    <p>ABCDEFGH</p>
    <p>ABCDEFGHI</p>
    <p>ABCDEFGHIJ</p>
    <p>ABCDEFGHIJK</p>
    <p>A lot of text to fit into 1em, you think?</p>
</div>

CSS

div { 
    -ms-writing-mode: tb-rl;
    -webkit-writing-mode: vertical-rl;
    -moz-writing-mode: vertical-rl;
    -ms-writing-mode: vertical-rl;
    writing-mode: vertical-rl;
    
    font-size: 2em;
}
p {
    display: inline;
    -webkit-text-combine-horizontal: all;
    -moz-text-combine-horizontal: all;
    -ms-text-combine-horizontal: all;
    text-combine-horizontal: all;
}