You might think the ChatGPT solution includes some fallbacks that maybe make it work in more browsers. You’d be wrong. There are exactly zero browsers in which the ChatGPT solution isn’t broken. Zero! Not a single one.

This activates cross-document View Transitions. It ensures any element that’s the same from one page to the next stays exactly in place. It keeps the background color of the site constant. And then anything that’s different — new elements appearing, old elements disappearing, page background changing to a different color — by default, all of these changes happen in a crossfade.

It also feels like this could eventually lead to a Grand Unified Layout Platform — a GULP, if you will — where we don’t even have to say whether a given layout’s display is flex or grid, but instead specify the exact behaviors we want using various item-* properties to get just the right ratio of flexible and grid-like qualities for a given situation.

This is the first part of a series that dives deep into the shape function, starting with shapes that use lines and arcs.

Accessibility in HTML emails remains critically under-addressed in 2025. Across the ecosystem, accessibility failures are systemic, widespread, and largely preventable. After analyzing 443,585 emails collected over the past year, we found that 99.89% contain accessibility issues rated “Serious” or “Critical.” Only 21 emails passed all automated accessibility checks, and they came from just two brands.