Depth of field in a flat animation

Give me an edit brief: where it goes on the timeline, the exact settings, and what to check before export, for a short video about [your product], for [your audience]. The technique is depth of field in a flat animation: a coded scene looks shot on a camera. How it works: blur the layers behind and in front of the subject and keep the subject sharp. It is right for: interface and product animations built from flat layers. It does not need a 3D tool: blurring the layers behind and in front of the subject does it in a 2D template. 3D transforms can blur text in a browser renderer; render at double scale or keep text off the depth axis. Be concrete: numbers, seconds and settings, no theory. Ask me one question first if something you need is missing.