Jen Simmons introduces the :open pseudo-class for styling open <details>, <dialog>, <select>, and <input> elements, the element-scoped keyword for random(), color-interpolation with linearRGB for SVG gradients, ToggleEvent.source for the popover API, and the new Origin API for structured origin comparisons. Plus 63 bug fixes across SVG, WebRTC, networking, editing, anchor positioning, and scroll-driven animations.
WebKit features for Safari 26.5
