Safari 27.0 ships with a Model Cooperation Protocol (MCP) server that lets coding agents like Claude control your browser to test code, plus major improvements to form controls and 3D model support. The real story is 844 quality fixes addressing compatibility, standards alignment, and feature interactions that were previously broken.

• Safari MCP lets AI coding agents see how your code renders in real-time, check accessibility issues, and test across browsers without you manually sharing screenshots or jumping between windows
• The customizable `<select>` element now supports full CSS styling and custom HTML content inside options, with improved default styles that don't require extra work to make usable
• The release includes 844 bug fixes (up from 525 announced at WWDC), with deep work on SVG (66 fixes), HTML tables, CSS Zoom rebuild, and fixes for feature interactions like `-webkit-line-clamp` combined with `text-wrap: balance`