Frontend Focus issue #746 covers several web platform topics: CSS @function evaluation scope and how custom functions resolve variables from their call site rather than inheriting through the DOM; Safari 27's customizable select element best practices; debugging 3D view transitions and the view transition pseudo-element tree; a JS-to-CSS bridge library (Prop For That) that exposes live JS values like mouse position as CSS custom properties; and the MDN MCP Server for bringing MDN docs into AI agents and IDEs.
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