Day 71: the masonry keyword

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It’s time to get me up to speed with modern CSS. There’s so much new in CSS that I know too little about. To change that I’ve started #100DaysOfMoreOrLessModernCSS. Why more or less modern CSS? Because some topics will be about cutting-edge features, while other stuff has been around for quite a while already, but I just have little to no experience with it.


The masonry keyword allows you to create masonry grid layouts.

If you want to create a masonry layout, all you have to do is turn one of the grid axes into a masonry axis using the masonry keyword.

<ol>
<li>
<a href="/blog/2023/100daysof-day70/">
Day 70: the defined pseudo-class
</a>
</li>
<li>
<a href="/blog/2022/100daysof-day69/">
Day 69: width in container queries
</a>
</li>
<li>
<a href="/blog/2022/100daysof-day68/">
Day 68: cascade layers and browser support
</a>
</li>

</ol>
ol {
display: grid;
gap: 1rem;
grid-template-columns: repeat(auto-fill, minmax(16.5rem, 1fr));
grid-template-rows: masonry;
}

This simple layout turns into…

A 7-column grid. All items in a row have the same height. They're as large as the largest item in the row.

…this “so much better” layout.

A 7-column grid. All items have a different height. They're only as large as they have to be.

You can also turn the other axis into the masonry axis.

ol {
display: grid;
gap: 1rem;
grid-template-columns: masonry;
grid-template-rows: repeat(auto-fill, 6rem);
}
A 4-rows grid. Each item in each row is as wide as its content.

Accessibility

By default, the packing algorithm puts items into the column with the most space. This may cause a disconnect between DOM and tabbing order, which can be an issue for keyboard and screen reader users. Test your masonry grids sufficiently.

Browser support

Why am I showing screenshots instead of rendering the result directly? Well, because Firefox is the only browser that supports the keyword at the moment and the feature is still behind a flag. You can enable it by visiting about:config and setting layout.css.grid-template-masonry-value.enabled to true.

Can you use it today? Yeah, why not?! Most users will still get a grid, it's just not a masonry layout.

See on CodePen.