How to display a reverse-ordered list in HTML?

You could rotate the parent element 180deg and then rotate the children elements -180deg.

ul {
    transform: rotate(180deg);
}
ul > li {
    transform: rotate(-180deg);
}

Example Here

Alternatively, you could use flex boxes along with the order property.

Although this isn't technically reversing the order, you could also use counter-increment along with a psuedo element.

Example Here

ul {
    list-style-type:none;
    counter-reset:item 6;
}
ul > li {
    counter-increment:item -1;
}
ul > li:after {
    content: counter(item);
}

You can use flexbox to achieve this. It allows you to reverse the order with the flex-direction property.

ol { 
    display: flex;
    flex-direction: column-reverse;
}

li {
    flex: 0 0 auto;
}

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