A years-old problem, finally fixed
Anyone who has ever opened a link in Safari while listening to music or a podcast knows how frustrating it was: audio from the web page — an autoplaying video, a sound banner, an uninvited player — immediately interrupted ongoing playback with no easy way to manage it. iOS 27 changes this behavior directly: web audio no longer automatically takes priority over the system audio stream.
The change is listed among the 263 keynote improvements documented in full by iClarified. It is not a new feature in the strict sense, but a behavior correction expected by a large portion of users. The adopted model is similar to what desktop browsers have managed for years through autoplay policy: web page audio does not automatically get system audio focus.
Practical impact
In concrete terms: opening an article with an embedded video in Safari will no longer stop Apple Music, Spotify, Overcast, or any other audio app. The exact behavior — whether web audio is muted, paused, or simply does not take control until the user interacts — is not yet documented in the public technical details of the beta, but the result for the user is that playback is no longer involuntarily interrupted.