Home Blog New to the web platform in May Stay organized with collections Save and categorize content based on your preferences. Discover some of the interesting features that have landed in stable and beta web browsers during May 2026. Rachel Andrew GitHub LinkedIn Mastodon Bluesky Homepage Published: May 29, 2026 Stable browser releases Chrome 148 , Firefox 151 , and Safari 26.5 released to stable during May. This post takes a look at the many new features this month. Note: Browser compatibility data pulled from MDN is included in these posts and may not have been updated yet for very recent browser releases. The post will show the correct information as soon as it appears in the browser-compat-data release . The :open CSS pseudo-class becomes Baseline Safari 26.5 is mostly a release of fixes to existing features. However, it also includes support for the :open pseudo-class , making this feature Baseline Newly available. The :open pseudo-class lets you style elements that have "open" and "closed" states when they are open. This applies to elements such as <details> and <dialog> when they are open, as well as <select> and <input> elements (like color or date pickers) when their picker interfaces are showing. This provides a cleaner, semantic alternative to styling using attributes like details[open] . Browser Support 133 133 136 26.5 Source CSS name-only container queries become Baseline With Chrome 148 shipping this month, name-only container queries are now Baseline Newly available. Previously, when writing a container query, you were required to specify a size or style query condition alongside the container name, and establish the container's type with the container-type property. Now, you can query the presence of a named container by its name only, without any additional condition. Furthermore, you no longer need to set a container-type on the ancestor if you are only querying by name: # container { container-nam
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