Creating an Auto-Closing Notification With an HTML Popover

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This is the third article in a series about the CSS shape() function. We’ve covered drawing lines and arcs in previous articles and, this time, we look specifically at the curve command and how to use it for drawing complex shapes.

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The contrast-color() function doesn’t check color contrast, but rather it outright resolves to either black or white (whichever one contrasts the most with your chosen color). Safari Technology Preview recently implemented it and we explore its possible uses in this article.

The State of CSS 2025 Survey dropped a few days ago, and besides anticipating the results, it’s exciting to see a lot of the new things shipped to CSS reflected in the questions.

So, how can you take dialogue box design beyond the generic look of frameworks and templates? How can you style them to reflect a brand’s visual identity and help to tell its stories? Here’s how I do it in CSS using ::backdrop, backdrop-filter, and animations.

This is the second part of a series that dives deep into the CSS shape() command, continuing with a more detailed look at the arc command.